Methionine is specified by the codon AUG, which is also known as the start codon. Consequently, methionine is the first amino acid to dock in the ribosome during the synthesis of proteins.

The start codon is typically AUG, which stands for methionine, and signals the beginning of that particular protein synthesis ...

We find that these inhibitors slow elongating ribosomes, thereby inducing a queue of pre-initiation complexes that can become positioned over and initiate from an otherwise poorly recognized start ...