Protein kinase A is an enzyme that phosphorelates a downstream target peptide. It has a conserved motif called glycine lead where the atp is held during catalysation. The sequence of the glycine lead is GXGXXGXV. The X residues despite being free to be any amino acid remains evolutionarily consistent, the codons coding those residues diversifies in accordance with evolutionary pattern.
Good video. the reverb on the audio makes it hard to understand you, however
jwcornish 2 years ago