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Quiz 11
Course: BIO 344, Fall 2008School: University of Texas
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BIO 344-QUIZ 11 EUKARYOTIC TRANSLATION INITAITION FACTORS The process of translational initiation in Eukaryotes involves the coming together of the ribosome (small and large subunits), the methionine-charged tRNA, and the mRNA. This process is facilitated by eukaryotic initiation factors (eIF s). In the diagram below label where each initiation factor would act in the assembly of the 80S initiation complex EIF4...
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BIO 344-QUIZ 11 EUKARYOTIC TRANSLATION INITAITION FACTORS The process of translational initiation in Eukaryotes involves the coming together of the ribosome (small and large subunits), the methionine-charged tRNA, and the mRNA. This process is facilitated by eukaryotic initiation factors (eIF s). In the diagram below label where each initiation factor would act in the assembly of the 80S initiation complex EIF4 eIF4 (also know as eIF4F) is the initiation factor that is responsible for binding the 40S ribosome to the 7meG-cap on the mRNA. It is a complex protein containing three subunits: eIF4G, EiF4A, and eIF4E. a) What are the functions of each of the subunits? b) What is some evidence that eIF4A actually performs the function that you listed above? What other protein must be involved for eIF4A to function? c) Name the proteins or other structures that eIF4G interacts with this might be easiest to visualize if you draw a simplified diagram. What does you drawing suggest about the function of eIF4G? EIF1 and eIF1A What would happen in you added all of the above-mentioned precursors for translation (including all other initiation factors) but not eIF1 and eIF1A? What does this tell us about the function of these two proteins? (Figures 17.34, 17.35) EIF2 Heme starvation in reticulocytes was the experimental model used to study phosphorylation of initiation factor EIF2. You should learn how this (or other phosphorylation events) is a major regulatory mechanism of translational initiation. (See figure 17.38 or notes) MAPPING <a href="/keyword/peptide-bond/" >peptide bond</a> FORMATION **Note that now the lectures have shifted back to prokaryotes: E. Coli, T. Aquaticus and Haloarcula are the models for study** In vitro, purified ribosomes can catalyze <a href="/keyword/peptide-bond/" >peptide bond</a> formation without any soluble protein factors. Recall that ribosomes are composed of two components: protein and RNA. The question now becomes which of these two contain the active site for <a href="/keyword/peptide-bond/" >peptide bond</a> formation (i.e. peptidly-transferase (PT) activity) The key point that Dr. Herrin is trying to get across in the last two lectures is that <a href="/keyword/peptide-bond/" >peptide bond</a> formation is catalyzed by the RNA and therefore rRNA is a ribozyme. (see bottom box in notes on pg 7 of translation 4-lecture for summary) a) In order to understand the experiments that follow, be sure to know the three major steps (and associated proteins) inv...
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BIO 344-QUIZ 11EUKARYOTIC TRANSLATION INITAITION FACTORS The process of translational initiation in Eukaryotes involves the coming together of the ribosome (small and large subunits), the methionine-charged tRNA, and the mRNA. This process is facili
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