Nh

D-Amino acids are useful compounds for the preparation of physiologically active peptides and ^-lactam antibiotics such as semisynthetic penicillins and cephalospo-rins. DCase activity was first found in rat liver (1) and microbial cells (2-5) about 40 years ago. These enzymes were examined as to their properties and substrate specificities, and their reaction mechanisms and biological functions were deduced. The enzymes from rat liver and Clos-tridium uracilicum (2) were found to be involved in the degradation of pyrimidine, and the enzyme from Pseudo-

Table 1. Substrate Specificities of Screened Enzymes
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