Translation. Host Cell Shutoff 1) Initiation of eukaryotic translation involves many initiation factors
|
|
- Georgia Richards
- 5 years ago
- Views:
Transcription
1 Translation Questions? 1) How does poliovirus shutoff eukaryotic translation? 2) If eukaryotic messages are not translated how can poliovirus get its message translated? Host Cell Shutoff 1) Initiation of eukaryotic translation involves many initiation factors 2) Pathway for initiation is more complicated than for prokaryotic translation a) initiator met trna binds to the 40S subunit in the presence of eif-2 b) eif-4f + GTP enter the complex and recognize a capped mrna c) the complex then scans down the RNA until an AUG is found d) eif-5 binds as eif-2 leaves allowing the 60S subunit to bind and the peptide bond formation starts Spring
2 Translation (cont d) 3) eif-4f is involved in cap recognition and mrna binding (270000D) a) made up of three subunits i) cap binding protein (also known as eif-4e, 25000D) ii) ATP-dependent RNA helicase, removes secondary structure from the 5' end of mrnas (also known as eif-4a, 25000D) iii) p220, or eif-4g, function unknown binds to eif-4a and -4E b) p220 is cleaved in poliovirus-infected cells i) direct analysis of cleaved products ii) purified eif4-f can restore cap-dependent translation iii) poliovirus-infected cells can contribute all components to a fractionated in vitro translation system except eif-4f c) cap-independent translation can occur d) viral-proteinase responsible? i) antibodies to 3C to not inhibit cleavage ii) 3C cleavage activity does not co-purify with p220 cleavage iii) translation of 2A by itself leads to p220 cleavage Spring
3 Spring
4 Translation (cont d) Ok, so how does polio get its RNA translated? 1) polio has a 5' nontranslated region of ~750 nt before the AUG that initiates the polyprotein; this region contains 7 unused AUGs 2) mutations in the 5' nontranslated region can have a dramatic affect on pathogenesis 3) internal ribosome binding has been shown to occur using bicistronic mrna 4) the internal entry is insensitive to cap analog inhibition (cap-independent) 5) this sequence has been called: IRES (internal ribosome binding site) 6) these sequences are ~400 to 500 nts in length and consist of a series of highly ordered secondary structures Spring
5 A) EMCV (Type II) IRES I 560 A 620 Initiating AUG codon nt 834 D C 100 F L 800 M N B E K 700 G 420 H 3 J B) PV (Type I) IRES IV I II III V VI VPg Poly (C) Pyrimidinerich tract AUG AUG codon IRES nt Initiating AUG codon nt 743 AUG 3 Spring AUG Spacer (15-20 nts) AUG
6 Spring
7 Cellular Proteins? What are the cellular proteins that bind to this sequence? 1) Currently there are no known eif that bind 2) there is a highly conserved polypyrimidine tract that lies either ~20nt before the initiator AUG (EMC) or ~175 nt before the initiator AUG (polio) 3) p52 binds to this tract as determined by crosslinking studies i) p52 is the La autoantigen (patients with lupus have ab) ii) La is known to bind 3' oligouridylates on RNA pol III transcripts iii) it is believed to play a role in RNA pol III transcription termination iv) purified La stimulates poliovirus translation in vitro 4) p57 binds to near stem loop V and VI i) p57 is the pyrimidine-tract binding protein (PTB) ii) has been implicated in nuclear processes involving pre-mrna iii) immunodepletion of PTB inhibits polio and EMC translation but not globin 5) poly (rc) binding protein 5) What are nuclear proteins doing in the cytoplasm and why are they helping viruses? 6) There are several examples of internal initiation for several cellular messages: a) antennapedia mrna b) fibroblast growth factor mrna c) Bip mrna Spring
8 Assembly 1) Proteolytic processing of the P1 proteins a. cleavage of the P1/2A cleavage site by 2A pro b. cleavage of P1 by 3CD: generates three viral coat proteins VP1, VP3, VP0 (VP4 + VP2; this cleavage occurs later in assembly) 2) These three viral proteins form the basic building block of the virus termed the protomer (smallest identical subunit of an oligomeric protein). The protomer exists in infected cells and is described by its sedimentaion value: the 5S particle 3) 5 protomers assemble to form a pentamer or 14S particle 4) 12 pentamers assemble to form either: a. procapsid (a 70S empty capsid, ie no RNA) that is subsequently packaged with viral RNA to form a provirion b. provirion - a complete particle that must undergo a maturation cleavage to generate infectious 155S virions 5) Maturation cleavage: a. cleavage of VP0 into VP2 + VP4 b. mechanism unclear, RNA probably required Spring
9 Spring
10 Atomic Structure of the Protomer 1) protomer is wedge-shaped with VP1, VP2, VP3 occupying separate domains on the outer surface, VP4 is internal 2) VP1, VP2, VP3 structurally similar with one another 3) Fold consists of 8 antiparallel beta barrels - has been seen with every RNA virus capsid protein seen so far (except Sindbis) 4) Loops connecting beta strands form some of the protruding surface features seen in the virus, most of the neutralizing immunogenic sites (NIM) are found in these loops 5) protomers are connected at the pentamer vertex through the amino-terminal tails of VP3 -> they form a twisted tube called the beta annulus 6) protomers are connected together by intertwining of VP1, VP3, and VP0 N and C tails, once VP0 undergoes cleavage VP2 is only loosely associated Spring
11 Spring 2002 Picornavirus Structure 225
12 Spring
13 Receptors Receptors: Function as attachment sites for a virus, the receptor may or may not be involved in virus / nucleic acid penetration. There are many ways to isolate a cellular receptor for a virus, usually one starts with: 1) an antibody directed against the cellular protein How do you get this? a. injection of cells into mice to generate monoclonals that recognize the receptor b. purify protein by affinity to virus and generate antibodies 2) a receptor negative cell line (virus insensitive cell line) a. transfection of cdna from a receptor positive cell line can transform such cells from insensitive to virus sensitive cells b. transfection of cdna from a receptor positive cell line can be screened with a monoclonal antibody against the receptor protein Spring
14 Picornavirus Receptors Spring
15 Rhinovirus Receptor Spring
16 The Canyon Hypothesis Spring
17 Entry I 1) Binding of virus to the cell surface causes a conformational change in the virion resulting in the release of VP4 and the conversion of the infectious particle to a non-infectious A-particle 2) Binding of poliovirus to soluble receptor results in conversion of infectious particle to the non-infectious A-particle 3) Observations (1) and (2) suggest a pathway for entry: following binding of virus particles to the receptor, conformational changes occur which result in the release of the internal VP4 molecules and positioning of the hydrophobic N-termini of VP1 into the membrane forming a pore by which the genome RNA passes through. Spring
18 Entry II Spring
Picornaviruses. Virion. Genome. Genes and proteins. Viruses and hosts. Diseases. Distinctive characteristics
Picornaviruses Virion Genome Genes and proteins Viruses and hosts Diseases Distinctive characteristics Virion Naked icosahedral capsid (T=1) Diameter of 30 nm Genome Linear single-stranded RNA, positive
More informationPolyomaviridae. Spring
Polyomaviridae Spring 2002 331 Antibody Prevalence for BK & JC Viruses Spring 2002 332 Polyoma Viruses General characteristics Papovaviridae: PA - papilloma; PO - polyoma; VA - vacuolating agent a. 45nm
More informationVirology Journal. Open Access. Abstract. BioMed Central
Virology Journal BioMed Central Research Stimulation of poliovirus RNA synthesis and virus maturation in a HeLa cell-free in vitro translation-rna replication system by viral protein 3CD pro David Franco
More informationStructural biology of viruses
Structural biology of viruses Biophysical Chemistry 1, Fall 2010 Coat proteins DNA/RNA packaging Reading assignment: Chap. 15 Virus particles self-assemble from coat monomers Virus Structure and Function
More informationProteins and symmetry
Proteins and symmetry Viruses (symmetry) Viruses come in many shapes, sizes and compositions All carry genomic nucleic acid (RNA or DNA) Structurally and genetically the simplest are the spherical viruses
More informationRNA (Ribonucleic acid)
RNA (Ribonucleic acid) Structure: Similar to that of DNA except: 1- it is single stranded polunucleotide chain. 2- Sugar is ribose 3- Uracil is instead of thymine There are 3 types of RNA: 1- Ribosomal
More informationFoot-and-Mouth Disease
CLINICAL MICROBIOLOGY REVIEWS, Apr. 2004, p. 465 493 Vol. 17, No. 2 0893-8512/04/$08.00 0 DOI: 10.1128/CMR.17.2.465 493.2004 Foot-and-Mouth Disease Marvin J. Grubman* and Barry Baxt Plum Island Animal
More informationLecture 2: Virology. I. Background
Lecture 2: Virology I. Background A. Properties 1. Simple biological systems a. Aggregates of nucleic acids and protein 2. Non-living a. Cannot reproduce or carry out metabolic activities outside of a
More informationViral structure م.م رنا مشعل
Viral structure م.م رنا مشعل Viruses must reproduce (replicate) within cells, because they cannot generate energy or synthesize proteins. Because they can reproduce only within cells, viruses are obligate
More information1. Investigate the structure of the trna Synthase in complex with a trna molecule. (pdb ID 1ASY).
Problem Set 11 (Due Nov 25 th ) 1. Investigate the structure of the trna Synthase in complex with a trna molecule. (pdb ID 1ASY). a. Why don t trna molecules contain a 5 triphosphate like other RNA molecules
More informationCoronaviruses. Virion. Genome. Genes and proteins. Viruses and hosts. Diseases. Distinctive characteristics
Coronaviruses Virion Genome Genes and proteins Viruses and hosts Diseases Distinctive characteristics Virion Spherical enveloped particles studded with clubbed spikes Diameter 120-160 nm Coiled helical
More informationOverview of virus life cycle
Overview of virus life cycle cell recognition and internalization release from cells progeny virus assembly membrane breaching nucleus capsid disassembly and genome release replication and translation
More informationObjectives: Prof.Dr. H.D.El-Yassin
Protein Synthesis and drugs that inhibit protein synthesis Objectives: 1. To understand the steps involved in the translation process that leads to protein synthesis 2. To understand and know about all
More informationThere are approximately 30,000 proteasomes in a typical human cell Each proteasome is approximately 700 kda in size The proteasome is made up of 3
Proteasomes Proteasomes Proteasomes are responsible for degrading proteins that have been damaged, assembled improperly, or that are of no profitable use to the cell. The unwanted protein is literally
More informationLast time we talked about the few steps in viral replication cycle and the un-coating stage:
Zeina Al-Momani Last time we talked about the few steps in viral replication cycle and the un-coating stage: Un-coating: is a general term for the events which occur after penetration, we talked about
More informationPre-mRNA has introns The splicing complex recognizes semiconserved sequences
Adding a 5 cap Lecture 4 mrna splicing and protein synthesis Another day in the life of a gene. Pre-mRNA has introns The splicing complex recognizes semiconserved sequences Introns are removed by a process
More informationLife Sciences 1A Midterm Exam 2. November 13, 2006
Name: TF: Section Time Life Sciences 1A Midterm Exam 2 November 13, 2006 Please write legibly in the space provided below each question. You may not use calculators on this exam. We prefer that you use
More informationTRANSLATION. Translation is a process where proteins are made by the ribosomes on the mrna strand.
TRANSLATION Dr. Mahesha H B, Yuvaraja s College, University of Mysore, Mysuru. Translation is a process where proteins are made by the ribosomes on the mrna strand. Or The process in the ribosomes of a
More informationMolecular Cell Biology - Problem Drill 10: Gene Expression in Eukaryotes
Molecular Cell Biology - Problem Drill 10: Gene Expression in Eukaryotes Question No. 1 of 10 1. Which of the following statements about gene expression control in eukaryotes is correct? Question #1 (A)
More informationProtein Synthesis
Protein Synthesis 10.6-10.16 Objectives - To explain the central dogma - To understand the steps of transcription and translation in order to explain how our genes create proteins necessary for survival.
More informationBiochemistry 2000 Sample Question Transcription, Translation and Lipids. (1) Give brief definitions or unique descriptions of the following terms:
(1) Give brief definitions or unique descriptions of the following terms: (a) exon (b) holoenzyme (c) anticodon (d) trans fatty acid (e) poly A tail (f) open complex (g) Fluid Mosaic Model (h) embedded
More informationTranscriptional control in Eukaryotes: (chapter 13 pp276) Chromatin structure affects gene expression. Chromatin Array of nuc
Transcriptional control in Eukaryotes: (chapter 13 pp276) Chromatin structure affects gene expression Chromatin Array of nuc 1 Transcriptional control in Eukaryotes: Chromatin undergoes structural changes
More informationExplain that each trna molecule is recognised by a trna-activating enzyme that binds a specific amino acid to the trna, using ATP for energy
7.4 - Translation 7.4.1 - Explain that each trna molecule is recognised by a trna-activating enzyme that binds a specific amino acid to the trna, using ATP for energy Each amino acid has a specific trna-activating
More informationDNA codes for RNA, which guides protein synthesis.
Section 3: DNA codes for RNA, which guides protein synthesis. K What I Know W What I Want to Find Out L What I Learned Vocabulary Review synthesis New RNA messenger RNA ribosomal RNA transfer RNA transcription
More informationRNA Processing in Eukaryotes *
OpenStax-CNX module: m44532 1 RNA Processing in Eukaryotes * OpenStax This work is produced by OpenStax-CNX and licensed under the Creative Commons Attribution License 3.0 By the end of this section, you
More informationIslamic University Faculty of Medicine
Islamic University Faculty of Medicine 2012 2013 2 RNA is a modular structure built from a combination of secondary and tertiary structural motifs. RNA chains fold into unique 3 D structures, which act
More informationnumber Done by Corrected by Doctor Ashraf
number 4 Done by Nedaa Bani Ata Corrected by Rama Nada Doctor Ashraf Genome replication and gene expression Remember the steps of viral replication from the last lecture: Attachment, Adsorption, Penetration,
More informationCELLS. Cells. Basic unit of life (except virus)
Basic unit of life (except virus) CELLS Prokaryotic, w/o nucleus, bacteria Eukaryotic, w/ nucleus Various cell types specialized for particular function. Differentiation. Over 200 human cell types 56%
More informationTranslational Control of Viral Gene Expression in Eukaryotes
MICROBIOLOGY AND MOLECULAR BIOLOGY REVIEWS, June 2000, p. 239 280 Vol. 64, No. 2 1092-2172/00/$04.00 0 Copyright 2000, American Society for Microbiology. All Rights Reserved. Translational Control of Viral
More informationLESSON 4.4 WORKBOOK. How viruses make us sick: Viral Replication
DEFINITIONS OF TERMS Eukaryotic: Non-bacterial cell type (bacteria are prokaryotes).. LESSON 4.4 WORKBOOK How viruses make us sick: Viral Replication This lesson extends the principles we learned in Unit
More informationLesson 4. Molecular Virology
Lesson 4 Molecular Virology 1. Introduction 1.1. Virus Definition Genetic elements made of living matter molecules, that are capable of growth and multiplication only in living cells DIFFERENCE WITH RESPECT
More informationChapter 25. 바이러스 (The Viruses)
Chapter 25 바이러스 (The Viruses) Generalized Structure of Viruses 2 2 Virus Classification Classification based on numerous characteristics Nucleic acid type Presence or absence of envelope Capsid symmetry
More informationAP Biology. Viral diseases Polio. Chapter 18. Smallpox. Influenza: 1918 epidemic. Emerging viruses. A sense of size
Hepatitis Viral diseases Polio Chapter 18. Measles Viral Genetics Influenza: 1918 epidemic 30-40 million deaths world-wide Chicken pox Smallpox Eradicated in 1976 vaccinations ceased in 1980 at risk population?
More informationSevere Acute Respiratory Syndrome (SARS) Coronavirus
Severe Acute Respiratory Syndrome (SARS) Coronavirus Coronaviruses Coronaviruses are single stranded enveloped RNA viruses that have a helical geometry. Coronaviruses are the largest of RNA viruses with
More informationComputational Biology I LSM5191
Computational Biology I LSM5191 Aylwin Ng, D.Phil Lecture Notes: Transcriptome: Molecular Biology of Gene Expression II TRANSLATION RIBOSOMES: protein synthesizing machines Translation takes place on defined
More informationDr. Ahmed K. Ali Attachment and entry of viruses into cells
Lec. 6 Dr. Ahmed K. Ali Attachment and entry of viruses into cells The aim of a virus is to replicate itself, and in order to achieve this aim it needs to enter a host cell, make copies of itself and
More informationTranscription and RNA processing
Transcription and RNA processing Lecture 7 Biology W3310/4310 Virology Spring 2016 It is possible that Nature invented DNA for the purpose of achieving regulation at the transcriptional rather than at
More informationReoviruses. Virion. Genome. Genes and proteins. Viruses and hosts. Diseases. Distinctive characteristics
Reoviruses Virion Genome Genes and proteins Viruses and hosts Diseases Distinctive characteristics Virion Naked icosahedral capsid (T=13), diameter 60-85 nm Capsid consists of two or three concentric protein
More informationSTRUCTURE, GENERAL CHARACTERISTICS AND REPRODUCTION OF VIRUSES
STRUCTURE, GENERAL CHARACTERISTICS AND REPRODUCTION OF VIRUSES Introduction Viruses are noncellular genetic elements that use a living cell for their replication and have an extracellular state. Viruses
More informationPoint total. Page # Exam Total (out of 90) The number next to each intermediate represents the total # of C-C and C-H bonds in that molecule.
This exam is worth 90 points. Pages 2- have questions. Page 1 is for your reference only. Honor Code Agreement - Signature: Date: (You agree to not accept or provide assistance to anyone else during this
More informationBacteriophage Reproduction
Bacteriophage Reproduction Lytic and Lysogenic Cycles The following information is taken from: http://student.ccbcmd.edu/courses/bio141/lecguide/unit3/index.html#charvir Bacteriophage Structure More complex
More informationTranscription and RNA processing
Transcription and RNA processing Lecture 7 Biology 3310/4310 Virology Spring 2018 It is possible that Nature invented DNA for the purpose of achieving regulation at the transcriptional rather than at the
More informationMolecular Biology (BIOL 4320) Exam #2 May 3, 2004
Molecular Biology (BIOL 4320) Exam #2 May 3, 2004 Name SS# This exam is worth a total of 100 points. The number of points each question is worth is shown in parentheses after the question number. Good
More informationRegulation of Gene Expression in Eukaryotes
Ch. 19 Regulation of Gene Expression in Eukaryotes BIOL 222 Differential Gene Expression in Eukaryotes Signal Cells in a multicellular eukaryotic organism genetically identical differential gene expression
More informationAlternative RNA processing: Two examples of complex eukaryotic transcription units and the effect of mutations on expression of the encoded proteins.
Alternative RNA processing: Two examples of complex eukaryotic transcription units and the effect of mutations on expression of the encoded proteins. The RNA transcribed from a complex transcription unit
More informationMultiplication of RNA Plant Viruses. C.L. Mandahar
Multiplication of RNA Plant Viruses C.L. Mandahar MULTIPLICATION OF RNA PLANT VIRUSES Multiplication of RNA Plant Viruses by C. L. MANDAHAR Botany Department, Panjab University, Chandigarh, India A C.I.P.
More informationPROTEIN SYNTHESIS. It is known today that GENES direct the production of the proteins that determine the phonotypical characteristics of organisms.
PROTEIN SYNTHESIS It is known today that GENES direct the production of the proteins that determine the phonotypical characteristics of organisms.» GENES = a sequence of nucleotides in DNA that performs
More informationIdentification of Mutation(s) in. Associated with Neutralization Resistance. Miah Blomquist
Identification of Mutation(s) in the HIV 1 gp41 Subunit Associated with Neutralization Resistance Miah Blomquist What is HIV 1? HIV-1 is an epidemic that affects over 34 million people worldwide. HIV-1
More informationIntroduction retroposon
17.1 - Introduction A retrovirus is an RNA virus able to convert its sequence into DNA by reverse transcription A retroposon (retrotransposon) is a transposon that mobilizes via an RNA form; the DNA element
More informationSequences in the 5" Non-coding Region of Human Rhinovims 14 RNA that Affect in vitro Translation
J. gen. Virol. (1989), 70, 2799-2804. Printed in Great Britain 2799 Key words: rhinovirus, human type 14/5' non-coding region~in vitro translation Sequences in the 5" Non-coding Region of Human Rhinovims
More information1. Identify and characterize interesting phenomena! 2. Characterization should stimulate some questions/models! 3. Combine biochemistry and genetics
1. Identify and characterize interesting phenomena! 2. Characterization should stimulate some questions/models! 3. Combine biochemistry and genetics to gain mechanistic insight! 4. Return to step 2, as
More informationSection 6. Junaid Malek, M.D.
Section 6 Junaid Malek, M.D. The Golgi and gp160 gp160 transported from ER to the Golgi in coated vesicles These coated vesicles fuse to the cis portion of the Golgi and deposit their cargo in the cisternae
More informationIntroduction: RNA viruses
SECTION I Introduction: RNA viruses Carol Shoshkes Reiss Viruses that infect the central nervous system may cause acute, chronic, or latent infections. In some cases, the diseases manifested are attributable
More informationChapter 18. Viral Genetics. AP Biology
Chapter 18. Viral Genetics 2003-2004 1 A sense of size Comparing eukaryote bacterium virus 2 What is a virus? Is it alive? DNA or RNA enclosed in a protein coat Viruses are not cells Extremely tiny electron
More informationMolecular Biology (BIOL 4320) Exam #2 April 22, 2002
Molecular Biology (BIOL 4320) Exam #2 April 22, 2002 Name SS# This exam is worth a total of 100 points. The number of points each question is worth is shown in parentheses after the question number. Good
More informationThe Molecular Biology
The Molecular Biology of Poliovirus Friedrich Koch and Gebhard Koch Springer-~rlag Wien New York Dr. Friedrich Koch Prof. Dr. Gebhard Koch Abteilung Molekularbiologie Universitat Hamburg, Federal Republic
More informationUnit 13.2: Viruses. Vocabulary capsid latency vaccine virion
Unit 13.2: Viruses Lesson Objectives Describe the structure of viruses. Outline the discovery and origins of viruses. Explain how viruses replicate. Explain how viruses cause human disease. Describe how
More informationL I F E S C I E N C E S
1a L I F E S C I E N C E S 5 -UUA AUA UUC GAA AGC UGC AUC GAA AAC UGU GAA UCA-3 5 -TTA ATA TTC GAA AGC TGC ATC GAA AAC TGT GAA TCA-3 3 -AAT TAT AAG CTT TCG ACG TAG CTT TTG ACA CTT AGT-5 NOVEMBER 2, 2006
More informationEukaryotic Gene Regulation
Eukaryotic Gene Regulation Chapter 19: Control of Eukaryotic Genome The BIG Questions How are genes turned on & off in eukaryotes? How do cells with the same genes differentiate to perform completely different,
More informationMCB Chapter 11. Topic E. Splicing mechanism Nuclear Transport Alternative control modes. Reading :
MCB Chapter 11 Topic E Splicing mechanism Nuclear Transport Alternative control modes Reading : 419-449 Topic E Michal Linial 14 Jan 2004 1 Self-splicing group I introns were the first examples of catalytic
More informationMaterials and Methods , The two-hybrid principle.
The enzymatic activity of an unknown protein which cleaves the phosphodiester bond between the tyrosine residue of a viral protein and the 5 terminus of the picornavirus RNA Introduction Every day there
More informationVirus Structure. Characteristics of capsids. Virus envelopes. Virion assembly John Wiley & Sons, Inc. All rights reserved.
Virus Structure Characteristics of capsids Virus envelopes Virion assembly Capsids package viral genomes and transmit them to a new host cell Capsid rigid, symmetrical container composed of viral protein
More information1. to understand how proteins find their destination in prokaryotic and eukaryotic cells 2. to know how proteins are bio-recycled
Protein Targeting Objectives 1. to understand how proteins find their destination in prokaryotic and eukaryotic cells 2. to know how proteins are bio-recycled As a protein is being synthesized, decisions
More informationVirology. *Viruses can be only observed by electron microscope never by light microscope. The size of the virus: nm in diameter.
Virology We are going to start with general introduction about viruses, they are everywhere around us; in food; within the environment; in direct contact to etc.. They may cause viral infection by itself
More informationTranslation Activity Guide
Translation Activity Guide Student Handout β-globin Translation Translation occurs in the cytoplasm of the cell and is defined as the synthesis of a protein (polypeptide) using information encoded in an
More informationMicrobiology Chapter 7 Viruses
Microbiology Chapter 7 Viruses 7:1 Viral Structure and Classification VIRUS: a biological particle composed of genetic material (DNA or RNA) encased in a protein coat CAPSID: protein coat surrounding a
More informationOctober 26, Lecture Readings. Vesicular Trafficking, Secretory Pathway, HIV Assembly and Exit from Cell
October 26, 2006 Vesicular Trafficking, Secretory Pathway, HIV Assembly and Exit from Cell 1. Secretory pathway a. Formation of coated vesicles b. SNAREs and vesicle targeting 2. Membrane fusion a. SNAREs
More informationOverview: Chapter 19 Viruses: A Borrowed Life
Overview: Chapter 19 Viruses: A Borrowed Life Viruses called bacteriophages can infect and set in motion a genetic takeover of bacteria, such as Escherichia coli Viruses lead a kind of borrowed life between
More informationBio 111 Study Guide Chapter 17 From Gene to Protein
Bio 111 Study Guide Chapter 17 From Gene to Protein BEFORE CLASS: Reading: Read the introduction on p. 333, skip the beginning of Concept 17.1 from p. 334 to the bottom of the first column on p. 336, and
More informationVirus Entry/Uncoating
Virus Entry/Uncoating Delivery of genome to inside of a cell Genome must be available for first step of replication The Problem--barriers to infection Virion Barriers: Non-enveloped viruses capsid Enveloped
More informationHUMAN IMMUNODEFICIENCY VIRUS
Futuro promisorio de la terapia antirretroviral: Nuevos blancos terapéuticos. María José Míguez, M.D., PhD., Universidad de Miami, EE.UU. HUMAN IMMUNODEFICIENCY VIRUS REVERSE TRANSCRIPTASA REPLICATION
More informationCytopathogenesis and Inhibition of Host Gene Expression by RNA Viruses
MICROBIOLOGY AND MOLECULAR BIOLOGY REVIEWS, Dec. 2000, p. 709 724 Vol. 64, No. 4 1092-2172/00/$04.00 0 Copyright 2000, American Society for Microbiology. All Rights Reserved. Cytopathogenesis and Inhibition
More informationViruses defined acellular organisms genomes nucleic acid replicate inside host cells host metabolic machinery ribosomes
The Viruses Viruses Viruses may be defined as acellular organisms whose genomes consist of nucleic acid, obligately replicate inside host cells using host metabolic machinery and ribosomes to form a pool
More informationTRANSLATION: 3 Stages to translation, can you guess what they are?
TRANSLATION: Translation: is the process by which a ribosome interprets a genetic message on mrna to place amino acids in a specific sequence in order to synthesize polypeptide. 3 Stages to translation,
More informationChapter 13B: Animal Viruses
Chapter 13B: Animal Viruses 1. Overview of Animal Viruses 2. DNA Viruses 3. RNA Viruses 4. Prions 1. Overview of Animal Viruses Life Cycle of Animal Viruses The basic life cycle stages of animal viruses
More informationChapter 13 Viruses, Viroids, and Prions. Biology 1009 Microbiology Johnson-Summer 2003
Chapter 13 Viruses, Viroids, and Prions Biology 1009 Microbiology Johnson-Summer 2003 Viruses Virology-study of viruses Characteristics: acellular obligate intracellular parasites no ribosomes or means
More informationViruses Tomasz Kordula, Ph.D.
Viruses Tomasz Kordula, Ph.D. Resources: Alberts et al., Molecular Biology of the Cell, pp. 295, 1330, 1431 1433; Lehninger CD Movie A0002201. Learning Objectives: 1. Understand parasitic life cycle of
More informationLEC 2, Medical biology, Theory, prepared by Dr. AYAT ALI
General Characteristics, Structure and Taxonomy of Viruses Viruses A virus is non-cellular organisms made up of genetic material and protein that can invade living cells. They are considered both a living
More informationAmino acids. Side chain. -Carbon atom. Carboxyl group. Amino group
PROTEINS Amino acids Side chain -Carbon atom Amino group Carboxyl group Amino acids Primary structure Amino acid monomers Peptide bond Peptide bond Amino group Carboxyl group Peptide bond N-terminal (
More information19 Viruses BIOLOGY. Outline. Structural Features and Characteristics. The Good the Bad and the Ugly. Structural Features and Characteristics
9 Viruses CAMPBELL BIOLOGY TENTH EDITION Reece Urry Cain Wasserman Minorsky Jackson Outline I. Viruses A. Structure of viruses B. Common Characteristics of Viruses C. Viral replication D. HIV Lecture Presentation
More informationA look at macromolecules (Text pages 38-54) What is the typical chemical composition of a cell? (Source of figures to right: Madigan et al.
A look at macromolecules (Text pages 38-54) What is the typical chemical composition of a cell? (Source of figures to right: Madigan et al. 2002 Chemical Bonds Ionic Electron-negativity differences cause
More informationChapter13 Characterizing and Classifying Viruses, Viroids, and Prions
Chapter13 Characterizing and Classifying Viruses, Viroids, and Prions 11/20/2017 MDufilho 1 Characteristics of Viruses Viruses Minuscule, acellular, infectious agent having either DNA or RNA Cause infections
More informationChapter 19: Viruses. 1. Viral Structure & Reproduction. What exactly is a Virus? 11/7/ Viral Structure & Reproduction. 2.
Chapter 19: Viruses 1. Viral Structure & Reproduction 2. Bacteriophages 3. Animal Viruses 4. Viroids & Prions 1. Viral Structure & Reproduction Chapter Reading pp. 393-396 What exactly is a Virus? Viruses
More informationChapter 32: Translation
Chapter 32: Translation Voet & Voet: Pages 1343-1385 (Parts of sections 1-3) Slide 1 Genetic code Translates the genetic information into functional proteins mrna is read in 5 to 3 direction Codons are
More informationMultiplication. Bernard Roizman. General Concepts
Multiplication Bernard Roizman General Concepts The pathologic effects of viral diseases result from (a) toxic effect of viral genes products on the metabolism of infected cells, (b) reactions of the host
More informationProcessing of RNA II Biochemistry 302. February 13, 2006
Processing of RNA II Biochemistry 302 February 13, 2006 Precursor mrna: introns and exons Intron: Transcribed RNA sequence removed from precursor RNA during the process of maturation (for class II genes:
More informationnumbe r Done by Corrected by Doctor
numbe r 5 Done by Mustafa Khader Corrected by Mahdi Sharawi Doctor Ashraf Khasawneh Viral Replication Mechanisms: (Protein Synthesis) 1. Monocistronic Method: All human cells practice the monocistronic
More informationChapter 21: Prokaryotes & Viruses
Chapter 21: Prokaryotes & Viruses Microorganisms Single-celled organisms that are too small to be seen without a microscope Bacteria are the smallest living organisms Viruses are smaller but are not alive
More informationSome living things are made of ONE cell, and are called. Other organisms are composed of many cells, and are called. (SEE PAGE 6)
Section: 1.1 Question of the Day: Name: Review of Old Information: N/A New Information: We tend to only think of animals as living. However, there is a great diversity of organisms that we consider living
More informationComplete Student Notes for BIOL2202
Complete Student Notes for BIOL2202 Revisiting Translation & the Genetic Code Overview How trna molecules interpret a degenerate genetic code and select the correct amino acid trna structure: modified
More informationVIRUSES. 1. Describe the structure of a virus by completing the following chart.
AP BIOLOGY MOLECULAR GENETICS ACTIVITY #3 NAME DATE HOUR VIRUSES 1. Describe the structure of a virus by completing the following chart. Viral Part Description of Part 2. Some viruses have an envelope
More informationChapter 19: Viruses. 1. Viral Structure & Reproduction. 2. Bacteriophages. 3. Animal Viruses. 4. Viroids & Prions
Chapter 19: Viruses 1. Viral Structure & Reproduction 2. Bacteriophages 3. Animal Viruses 4. Viroids & Prions 1. Viral Structure & Reproduction Chapter Reading pp. 393-396 What exactly is a Virus? Viruses
More informationVirus Basics. General Characteristics of Viruses. Chapter 13 & 14. Non-living entities. Can infect organisms of every domain
Virus Basics Chapter 13 & 14 General Characteristics of Viruses Non-living entities Not considered organisms Can infect organisms of every domain All life-forms Commonly referred to by organism they infect
More informationGenetics. Instructor: Dr. Jihad Abdallah Transcription of DNA
Genetics Instructor: Dr. Jihad Abdallah Transcription of DNA 1 3.4 A 2 Expression of Genetic information DNA Double stranded In the nucleus Transcription mrna Single stranded Translation In the cytoplasm
More information7.013 Spring 2005 Problem Set 7
MI Department of Biology 7.013: Introductory Biology - Spring 2005 Instructors: Professor Hazel Sive, Professor yler Jacks, Dr. Claudette Gardel 7.013 Spring 2005 Problem Set 7 FRIDAY May 6th, 2005 Question
More informationCells and Tissues 3PART C. PowerPoint Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College
PowerPoint Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College Cells and Tissues 3PART C Protein Synthesis Gene DNA segment that carries a blueprint for building
More informationMOLECULAR CELL BIOLOGY
1 Lodish Berk Kaiser Krieger scott Bretscher Ploegh Matsudaira MOLECULAR CELL BIOLOGY SEVENTH EDITION CHAPTER 13 Moving Proteins into Membranes and Organelles Copyright 2013 by W. H. Freeman and Company
More informationViral Capsids and Envelopes: Structure and Function
Viral Capsids and Envelopes: Structure and Function William Lucas, Harvard Medical School, Boston, Massachusetts, USA David M Knipe, Harvard Medical School, Boston, Massachusetts, USA Virus particles contain
More informationEukaryotic mrna is covalently processed in three ways prior to export from the nucleus:
RNA Processing Eukaryotic mrna is covalently processed in three ways prior to export from the nucleus: Transcripts are capped at their 5 end with a methylated guanosine nucleotide. Introns are removed
More informationLecture Readings. Vesicular Trafficking, Secretory Pathway, HIV Assembly and Exit from Cell
October 26, 2006 1 Vesicular Trafficking, Secretory Pathway, HIV Assembly and Exit from Cell 1. Secretory pathway a. Formation of coated vesicles b. SNAREs and vesicle targeting 2. Membrane fusion a. SNAREs
More information