title: Immobilized Streptomyces clavuligerus NP1 cells for biotransformation of penicillin G into deacetoxycephalosporin G.
abstract: An investigation was conducted to determine whether immobilized resting cells of Streptomyces clavuligerus NP1, entrapped on a polymeric matrix, are able to perform oxidative ring expansion of benzylpenicillin into deacetoxycephalosporin G by virtue of their deacetoxycephalosporin C synthase ("expandase") activity. Cells entrapped in polyethyleneimine-barium alginate (1.5%) were able to sustain activity for at least four 2-h cycles, whereas free resting cells were inactive after the second cycle. Although entrapped cells exhibited lower oxidative ring expansion activity than free resting cells, immobilization may offer storage stability, recyclability, and operational stability for biotransformation of penicillins to cephalosporins, thus contributing to the development of a biological means for the production of the important industrial intermediate 7-aminodeacetoxycephalosporanic acid.
authors.affiliation: Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA. demain@mit.edu
authors.forename: A L
authors.initials: AL
authors.lastname: Demain
authors.forename: M A
authors.initials: MA
authors.lastname: Báez-Vásquez
mesh_terms: D000464:Alginates / Q000737:chemistry; D002511:Cephalosporins / Q000378:metabolism*; D010400:Penicillin G / Q000378:metabolism*; D013302:Streptomyces / Q000166:cytology* / Q000378:metabolism*; D013997:Time Factors
chemical_list: D000464:Alginates; D002511:Cephalosporins; C405006:deacetoxycephalosporin G; D010400:Penicillin G