DrVirgo
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Termination of protein synthesis depends on stop codons recognized by which of the following?
A. Proteases that cleave the protein at its carboxyl end
B. Puromyci-like compounds that cap the carboxyl end of the protein
C. Release factors that promote peptidyl-tRNA hydrolysis
D. Ribonucleases that cleave mRNA sites
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| scion
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C. Release factors that promote peptidyl-tRNA hydrolysis
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| DrVirgo
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explain please?
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| study_ing
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releasing factors recognise that a termination signal resides in the a site.
with the help of GTP, HYDROLYSIS of the bond btw the peptide and the tRNA in the P site is promoted
Edited by study_ing on 06/05/06 - 03:05 PM
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| DrVirgo
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Thanks. 
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| Cedrick
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thanks
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| robin082006
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Is it mentioned in Kaplan study-ing?
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| study_ing
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nope i looked it up in harper
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| liwei
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The end of the code for the protein in the mRNA is signaled by one of three special codons called stop codons. These stop codons have the sequences UAA, UAG, and UGA. In prokaryotes, the stop codons are bound by one of two release factor proteins (RFs) in prokaryotes: RF1 or RF2. These release factors cause the ribosome to cleave the finished protein off the tRNA in the P site. A third release factor, RF3, is responsible for releasing RF1 and RF2 from the ribosome after they have recognized the stop codon and caused the protein to be cleaved off the tRNA. Eukaryotes appear to have one protein, eRF1, that performs the functions of RF1 and RF2, and a second protein, eRF3, that performs the function of RF3. Once released, the protein can then go on to perform its function in the cell
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| Chrales
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thx for this great explanation liwei
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| docarchana
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yes C
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| klimt
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so it's C.......
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