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Chapter 27: Q34P (page 1030)

Design an mRNA with the necessary prokaryotic control sites that codes for the octapeptide Lys - Pro - Ala - Gly - Thr - Glu - Asn - Ser.

Short Answer

Expert verified

mRNA for the octapeptide:

Step by step solution

01

Definition of mRNA

Messenger RNA (mRNA) is a form of single-stranded RNA that is involved in protein production.

02

Determining mRNA with prokaryotic control sites

The mRNA should contain both the start and stop codons. The first codon, AUG, codes for Met. There are only a few stop codon variants, such as UAA.

mRNA for the given peptide:

Because many codons encode each amino acid, so amino acid codons can differ in mRNA sequence.

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Most popular questions from this chapter

Describe how the 鈥渕eaning鈥� of each codon was determined.

The ribosome can transfer any peptidyl group from the P-site tRNA to any aminoacyl group on the A-site RNA, but the rate may vary with the identities of those groups. Propose an explanation of why the ribosome synthesizes poly-Pro sequences extremely slowly compared to other peptide sequences.

Calculate the energy required, in ATP equivalents, to synthesize a 100-residue protein from free amino acids in E. coli (assume that the N-terminal Met remains attached to the polypeptide and that no ribosomal proofreading occurs).

List some posttranslational modifications of proteins.

Describe how the double-sieve mechanism of IleRS promotes accurate tRNA aminoacylation.
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