1. Deciphering the Genetic Code:
* tRNA molecules act as adaptors between the genetic code in mRNA (messenger RNA) and the amino acids that make up proteins.
* Each tRNA molecule carries a specific amino acid and has an anticodon that recognizes a specific codon on mRNA.
* Codons are three-nucleotide sequences in mRNA that specify which amino acid should be added to a growing polypeptide chain.
2. Delivering Amino Acids to Ribosomes:
* tRNA molecules bind to their corresponding amino acids through a process called aminoacylation. This process is catalyzed by enzymes called aminoacyl tRNA synthetases.
* Once aminoacylated, tRNAs travel to the ribosomes, the protein synthesis machinery.
3. Facilitating Protein Synthesis:
* At the ribosome, tRNA molecules bind to the mRNA molecule through their anticodon, aligning the amino acid they carry with the corresponding codon.
* The ribosome then forms a peptide bond between the amino acid on the tRNA and the growing polypeptide chain.
* This process continues as the ribosome moves along the mRNA, adding amino acids one by one, ultimately creating a complete protein.
In summary, tRNA acts as a bridge between the genetic information in mRNA and the building blocks of proteins (amino acids). It ensures that the correct amino acids are added to the growing polypeptide chain, allowing for the accurate translation of the genetic code into functional proteins.
