PHOSPHATE INCORPORATION INTO ALKALINE PHOSPHATASE OF E. COLI

Abstract
Highly purified E. coli alkaline phosphatase reacts with inorganic phosphate yielding serine phosphate and serine -phosphate -containing peptides on partial acid hydrolysis. After digestion of the enzyme with trypsin only one major component contained radio-activity. This product may be degraded by acid hydrolysis to serine phosphate and the same peptides obtained from hydrolysis of the whole enzyme. The phosphate -binding serine most likely is in the active center of the enzymes. Methods of preparation of the enzyme and identification of the products of hydrolysis are given.