5.1.1.17 | Penecillium chrysogenum strains are constructed expressing cefD1 (isopenecillin N-CoA synthetase), cefD2 (isopenecillin N-CoA epimerase), cefEF (deacetylcephalosporin-actyltransferase), and cefG (deacetylcephalosporin C synthetase) genes cloned from Acremonium chrysogenum. HPLC analysis of cell extracts show that transformant TA64, TA71, and TA98 accumulate intracellularly deacetylcephalosporin C and, in the last strain (TA98), also cephalosporin C. |