aloitusaminohappo
Aloitusaminohappo, also known as the start codon, is a specific nucleotide sequence within messenger RNA (mRNA) that signals the beginning of protein synthesis. In most organisms, this sequence is AUG, which also codes for the amino acid methionine. When the ribosome encounters the AUG codon during translation, it initiates the process of building a polypeptide chain by recruiting the first tRNA carrying methionine. This methionine is often removed from the newly formed protein after synthesis is complete, but its presence is crucial for initiating the translation process.
The start codon is not just a signal for initiation; it also establishes the reading frame for