Respuesta :
Having the initiator tRNA in the P site is important because if the polypeptide chain is to grow, the A site must be empty to allow the next aminoacylate tRNA to come into the ribosome.
Why does initiator tRNA attach to the P site?
It is believed that the initiator tRNA plays a crucial part in identifying the start codon in the mRNA by directly binding to the P site of the small ribosomal subunit. Despite the fact that the initiation factors undoubtedly play a role in mediating these events, the structure of the tRNA itself is also crucial.
An incoming charged tRNA will connect at the A site after the first tRNA binds initially at the P site. The amino acid of the first tRNA (Met) will be transferred to the amino acid of the second tRNA through the formation of a peptide bond (in this case, Trp).
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