tRNA’s main role is to act as an adaptor that “reads” the mRNA code and brings the correct amino acids to the ribosome so a protein can be built in the right order.

Core role of tRNA

  • Each tRNA carries a specific amino acid at one end and has a three‑base anticodon at the other end that pairs with a complementary codon on mRNA.
  • During translation, tRNAs enter the ribosome, match their anticodons to mRNA codons, and add their amino acids to the growing polypeptide chain in sequence, ensuring proteins have the correct amino acid order.

How tRNA works in translation

  • The anticodon loop of tRNA recognizes a specific mRNA codon, which guarantees that each codon is translated into its correct amino acid according to the genetic code.
  • Enzymes first “charge” tRNAs with the right amino acid, then the ribosome uses these charged tRNAs to form peptide bonds between amino acids, step by step along the mRNA.

Extra roles and modern findings

  • Beyond classic protein synthesis, tRNAs and their fragments can influence gene expression, stress responses, and disease processes, showing they are active regulators, not just passive adaptors.
  • Recent research suggests some tRNAs can help tag mRNA transcripts for degradation, preventing certain genes from being expressed for too long.

In simple exam-style terms

  • tRNA = transfer RNA, adaptor between mRNA codons and amino acids.
  • Role:
    1. Recognize codons via its anticodon.
2. Carry the correct amino acid to the ribosome.

3. Help assemble the amino acid chain that becomes a protein.

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