Step 5 of 7 in the translation process:
Ribosome shifts three mRNA bases (met-tRNA is released, open spot occupied by new amino acid-tRNA): Met-Cys-tRNA moves inot the vacant P site as the ribosome ratchets three bases down (i.e., toward the 3' end) the mRNA molecule. Now, the A site is empy. The next codon is 5'-AUU-3'. This codes for isoleucine, so the Ile-tRNA will be bound to the ribosome complex at that site.