Q29-24E - Organic Chemistry (Mcmurry)

Question

The codon UAA stops protein synthesis. Why does the sequence UAAin the following stretch of mRNA not cause any problems?

-GCA-UUC-GAG-GUA-ACG-CCC-

Step-by-Step Solution

Answer

The UAA sequence of the given mRNA sequence stops the protein synthesis and comes as a codon sequence.

Introduction

Stop codons does not indicate which amino acid should be used. Ribosomes stall when they come across a stop codon. Two subunits of the ribosome are disassembled when it stalls. As a result, the translation is performed.

There are three stop codons in the genome. UAA, UAG, and UGA are their initials. Termination codons are another name for them.

UAA stretch mRNA sequence

Three nucleotides follow each other to form a codon. The following codons are obtained by separating the codons from the end of the mRNA segment.

-GCA-UUC-GAG-GUA-ACG-CCC-

The sequence of the given segment of mRNA contains UAA sequence, it comes as a codon sequence and the synthesis of proteins stops.