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How do transfer RNAs help build proteins?
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Protein
The molecular structure of a peptide (a small protein) consists of a sequence of amino acids.
Transfer RNA (tRNA) plays a critical role in protein synthesis by acting as a bridge between the genetic code and the physical assembly of amino acids into proteins.12
The process functions through the following steps:
- Activation: Specialized enzymes called aminoacyl-tRNA synthetases attach specific amino acids to their corresponding tRNA molecules.12
- Decoding: Messenger RNA (mRNA) provides the template for protein construction by presenting a sequence of nucleotide triplets known as codons. Each tRNA contains a complementary triplet that allows it to bind specifically to the mRNA sequence at the ribosome.132
- Assembly: As tRNAs bind to the mRNA-ribosome complex in the order dictated by the genetic code, they bring the required amino acids into position. The ribosome then catalyzes the formation of peptide bonds between these amino acids, linking them into a growing protein chain.13
- Release: Once the protein chain is complete, it detaches from the tRNA and the ribosome, allowing the protein to migrate to other parts of the cell for use.13