The vitamin B6 phosphate dependent enzymes are an important class of enzymes that catalyze a wide variety of biological transformations involved in the metabolism of amino acids and amines, such as transamination, decarboxylation, racemization, b-and y- elimination, and substitution.'Although the catalytic roles of vitamin B6 phosphate are amazingly versatile, its catalytic functions rely primarily on the ability of this cofactor to act ...