5.1.1.5 pyridoxal 5'-phosphate dependent on 727795, 728711 5.1.1.5 pyridoxal 5'-phosphate dependent on, cofactor binding residues of the enzyme are Thr245, Gly262, Tyr78, Gly263, Arg173, and Arg260, overview 728587 5.1.1.5 pyridoxal 5'-phosphate required, addition of pyridoxal 5'-phosphate cannot further improve the specific activity of the recombinant whole-cell BL21?LYR 747470