Question

In: Biology

The main function of tRNA is to * Identify amino acids and transport/ carries them to...

The main function of tRNA is to *
Identify amino acids and transport/ carries them to ribosomes
Induce the ribosome translocation
Inhibit protein synthesis
Catalyze the peptide bonds between two amino acids

Solutions

Expert Solution

  • During translation, tRNA carries amino acid to the ribosome, by matching anticodons to codons in mRNA.
  • The secondary structure of tRNA form the clover leaf structure with the anticodon arm having complementary nucleotides for base pairing with codons in mRNA.
  • The first aminoacyl tRNA is located in the P-site and second in the A site.
  • The enzyme aminoacyl tRNA synthetases help in binding of amino acid to the t-RNA to form aminoacyl tRNA.
  • The reaction includes ATP interacting with amino acid (AA) to release AMP-AA and provides energy for the bond formation.
  • The AMP-AA then binds to t-RNA forming aminoacyl tRNA.
  • The specific pairing of codon with corresponding anti-codon, is mediated by the proof-reading activity of the aminoacyl tRNA synthetases.
  • This is possible due to highly specific nature of aminoacyl tRNA synthetase enzyme.
  • Each of the enzymes specifically recognize the 20 amino acids.
  • Thus, aminoacyl tRNA synthetases play a major role in protein synthesis
  • In prokaryotes like bacteria, the initiator amino acid is the N-f-methionine, but in eukaryotes, it is the normal methionine.
  • Three nucleotides in t-RNA corresponds to triplet codons of mRNA.
  • Translation starts from start codon (AUG) and ends at stop codon (UAA, UAG,UGA).
  • Ribosomes also have catalytic activity as ribozyme.
  • During translation, peptidyl transferase activity helps in formation of petide bond.
  • 23S rRNA has peptidyl transferase activity.

Answer: Identify amino acids and transport/ carries them to ribosomes


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