... Abstract D-amino-acid oxidase (DAAO) is used as one of the two biocatalysts for two-step enzymatic conversion of cephalosporin C to 7-aminocephalosporanic acid, a starting compound for the production of new generation of (3-lactam antibiotics. The daao gene from T. variabilis was cloned and expressed in E. coli cells. ... Moscow University Chemistry Bulletin . 2002, Vol. ... 6, P. 353 . Copyright (C) Chemistry Dept., Moscow State University, 2002 . ...