<prompt> Aminoacyl tRNA synthetase is required for all except:LysineCysteineMethionineHydroxyproline  <response>: Some proteins contain additional amino acids that arise due to post-translational modification of existing amino acyl residues. Examples: Vitamin C mediated hydroxylation of proline and peptidyl lysine to 4-hydroxyproline and 5-hydroxylysine Vitamin K mediated g-carboxylation of glutamate Methylation Formylation Acetylation Prenylation addition of fatty acid residues Glypiation addition of Glycosyl PI anchor Phosphorylation Therefore Aminoacyl tRNA synthetase is not required by these. 