Two threonine dehydratases, I and 11, were found to occur in Euglena gracilis and each enzyme was purified partially. Like the biosynthetic threonine dehydratases of other organisms, dehydratase I was feedback-inhibited by isoleucine and not affected by adenylates. Dehydratase I1 was not influenced by branched-chain amino acids and adenylates. Occurrence of dehydratase 11, with a much higher ac...
