Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Chapter 34, Problem 3CHI
Speculate as to how MHC, TCR, and BCR molecules evolved to require accessory proteins or coreceptors for signal to be sent within the cell?
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Some viruses have mechanisms to down-regulate MHC class I protein expression on the surface of cells in which the virus is replicating. This immune evasion strategy might prevent effector CD8 cytotoxic T cells from recognizing and killing the virus-infected cells. Would this immune evasion strategy also prevent the initial activation of virus-specific CD8 T cells?
Yes, because no viral peptide:MHC class I complexes would form to activate CD8 T cells.
No, because dendritic cells would take up infected cells and cross-present viral peptides to activate CD8 T cells.
No, because some presentation of MHC class I complexes with viral peptides would occur before the virus could down-regulate all the surface MHC class I protein.
Yes, because this immune evasion strategy would also function in dendritic cells, even if the virus doesn’t replicate in dendritic cells.
No, because the type I interferon response induced by the virus infection will up-regulate MHC class I expression and override the…
During MHC class I synthesis and folding in the endoplasmic reticulum (ER), a process of peptide editing takes place as the newly synthesized MHC class I protein is held in a ‘peptide receptive’ state by binding to the calreticulin:ERp57:tapasin complex. Peptide editing ensures that the MHC class I molecules that reach the cell surface have stable, high affinity binding for their peptide cargo. Peptide editing is important to the immune response because it:
Maintains high levels of surface MHC class I expression
Ensures that MHC class I molecules are not degraded in the ER
Retains the nascent MHC class I molecule in a peptide receptive state
Allows surface MHC class I molecules to bind new peptides from the extracellular milieu
Prevents surface MHC class I molecules from undergoing peptide exchange at the cell surface
During MHC class I synthesis and folding in the endoplasmic reticulum (ER), a process of peptide editing takes place as
the newly synthesized MHC class I protein is held in a 'peptide-receptive state' by binding to the calreticulin:ERp57:tapasin
complex. Peptide editing ensures that the MHC class I molecules that reach the cell surface have stable, high-affinity
binding for their peptide cargo. Peptide editing is important to the immune response because it
maintains high levels of surface MHC class I expression.
ensures that MHC class I molecules are not degraded in the ER.
prevents surface MHC class I molecules from undergoing peptide exchange at the cell surface.
retains the nascent MHC class I molecule in a peptide-receptive state.
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Chapter 34 Solutions
Prescott's Microbiology
Ch. 34.2 - What does the term valence mean and how does an...Ch. 34.2 - Distinguish between self and nonself substances.Ch. 34.2 - Prob. 2RIACh. 34.2 - How does a hapten differ from an antigen?Ch. 34.3 - What are the types of adaptive immunity?Ch. 34.3 - What distinguishes natural from artificial...Ch. 34.3 - What are ways that active immunity is different...Ch. 34.3 - Of the four types of acquired immunity, which do...Ch. 34.4 - On what types of cells are MHC class I molecules...Ch. 34.4 - Prob. 2MI
Ch. 34.4 - What are MHCs and HLAs? Describe the roles of the...Ch. 34.4 - Prob. 2RIACh. 34.4 - Prob. 3RIACh. 34.4 - How are foreign peptides processed so as to...Ch. 34.5 - Prob. 1MICh. 34.5 - Prob. 1RIACh. 34.5 - Prob. 2RIACh. 34.5 - Describe antigen processing. How does this process...Ch. 34.5 - Prob. 4RIACh. 34.5 - Prob. 5RIACh. 34.5 - Prob. 6RIACh. 34.6 - Which cells are functioning as APCs in this...Ch. 34.6 - Prob. 1RIACh. 34.6 - Briefly compare and contrast B cells and T cells...Ch. 34.6 - Prob. 3RIACh. 34.6 - Prob. 4RIACh. 34.7 - Prob. 1MICh. 34.7 - Prob. 2MICh. 34.7 - Prob. 3MICh. 34.7 - Prob. 1.1RIACh. 34.7 - Prob. 1.2RIACh. 34.7 - Prob. 1.3RIACh. 34.7 - Prob. 1.4RIACh. 34.7 - Prob. 2.1RIACh. 34.7 - Prob. 2.2RIACh. 34.7 - Prob. 2.3RIACh. 34.7 - Prob. 2.4RIACh. 34.7 - Prob. 2.5RIACh. 34.7 - Prob. 3.1RIACh. 34.7 - Prob. 3.2RIACh. 34.7 - In addition to combinatorial joining, what other...Ch. 34.8 - What is the difference between a precipitation and...Ch. 34.8 - Prob. 1RIACh. 34.8 - Prob. 2RIACh. 34.8 - How does opsonization inhibit microbial adherence...Ch. 34.8 - Prob. 4RIACh. 34.9 - Prob. 1RIACh. 34.9 - How would you define anergy?Ch. 34.10 - Prob. 1MICh. 34.10 - Prob. 2MICh. 34.10 - Prob. 1.1RIACh. 34.10 - Prob. 1.2RIACh. 34.10 - Prob. 1.3RIACh. 34.10 - Prob. 1.4RIACh. 34.10 - Prob. 1.5RIACh. 34.10 - What is an autoimmune disease and how might it...Ch. 34.10 - Prob. 2.2RIACh. 34.10 - Prob. 2.3RIACh. 34.10 - Prob. 2.4RIACh. 34 - What properties of proteins make them suitable...Ch. 34 - What other biotechnologies could be invented based...Ch. 34 - Speculate as to how MHC, TCR, and BCR molecules...Ch. 34 - Prob. 4CHICh. 34 - Prob. 5CHICh. 34 - In an effort to better understand the mechanisms...Ch. 34 - Prob. 7CHI
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- The virus shown in the diagram below is only able to infect and replicate in epithelial cells. In order for the cross-presenting dendritic cell to display viral peptides, rather than self peptides on its surface MHC class I proteins, which of the following procedures could be utilized, starting with the components shown in the figure below? Mix epithelial cells with heat-killed virus, wait 24 hrs, wash away any virus particles outside the epithelial cells, then add epithelial cells to dendritic cells. Mix epithelial cells with viral peptides, wait 24 hrs, wash away any viral peptides not bound to the epithelial cells, then add epithelial cells to dendritic cells. Mix epithelial cells with live virus particles, wait 24 hrs, wash away any virus particles outside the epithelial cells, then add epithelial cells to dendritic cells. Mix dendritic cells with viral nucleic acids and epithelial cells for 24 hrs. MIx epithelial cells will viral nucleic acids, wait 24 hrs, wash away any viral…arrow_forwardThere are two classes of MHC molecules with distinct subunit compositions but similar three-dimensional structures. Both MHC class I and MHC class II molecules are highly polymorphic genes in the human population, with tens to hundreds of different alleles co-existing in the population. This means that a comparison of the MHC protein sequences between two individuals would reveal amino acid differences between one individual and the next. However, these amino acid differences are not randomly distributed along the entire protein, but are clustered in certain locations. In the figure below, the diagram that most correctly indicates the regions of greatest variability between different MHC proteins (shown by the red highlights) is:arrow_forwardA cell line carrying a mutation in a single gene is found to express very low levels of MHC class I on its surface. When infected with influenza virus, these cells are not recognized nor are they killed by a CD8 T cell line specific for an influenza peptide bound to the MHC class I protein expressed by these cells. Incubation of the mutant cell line with a large excess of this peptide in the cell culture medium overnight leads to the results shown below. What is the most likely candidate for the gene that is defective in the mutant cell line?arrow_forward
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- A mutant B cell line is examined by confocal microscopy after incubation with a microbial pathogen recognized by the BCR on these B cells. The B cells have been stained with antibodies to visualize the localization of polymerized actin and microtubules. As a control, wild-type B cells are examined. The results are shown in the figure below, with the numbers indicating the proportion of cells examined that show each pattern of staining. To identify the specific signaling defect in these mutant B cells, a reasonable biochemical assay would be to: Determine if BCR stimulation of mutant B cells produces enhanced binding of the B cell to the microbe Determine whether the mutant B cells have reduced levels of the enzyme Protein kinase C-q Determine whether the mutant B cells are overexpressing the enzyme Vav Determine whether BCR stimulation of mutant B cells promotes exchange of GDP for GTP on cdc42 Determine whether BCR stimulation of mutant B cells produces increased levels of DAGarrow_forwarda major cause of septic shock is the presence of lipopolysaccharide (LPS) from bacteria in the blood. suppose you have available purified LPS and several strain of mice, each with a mutation that inactivates a particular TLR gene. How might you use these mice to test the feasibility of treating septic shock with a drug that blocks TLR signaling?arrow_forwardPeptides are stably bound to MHC molecules, and also serve to stabilize the MHC molecule on the cell surface. Once expressed on the surface of host cells, an MHC protein remains stably associated with its bound peptide for several days. This highly stable peptide binding behavior is important because: a) It prevents peptide exchanges on the cell surface, ensuring that peptide:MHC complexes are reliable indicators of the proteins present inside that host cell. b) If the MHC protein lost its peptide it would become unstable, and would be rapidly internalized and degraded. c) Pathogens would otherwise evade the immune response by making decoy peptides that mimic host cell peptides. d) Pathogens would be able to evade the T cell response by making proteases that cleave MHC proteins inducing peptide release. e) Immune responses to infection often induce noxious chemicals that damage surface MHC proteins, and might result in peptide loss.arrow_forward
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