<prompt> Phosphorylation of which amino acid does not occur by protein kinase -AspargineThreonineSerineTyrosine  <response>: Ans. is a i.e., Aspargine Protein kinase mostly add phosphoryl group to a serine, threonine, or tyrosine residues. Some protein kinase target the side chains of histidine, lysine, arginine, aspaic acid and glutamic acid. 