Structures of the Michaelis Complex (1.2A) and the Covalent Acyl Intermediate (2.0A ) of Cefamandole Bound in the Active Sites of the Mycobacterium tuberculosis beta-Lactamase K72A and E166A Mutants

Journal Article · Sat Dec 31 00:00:00 EST 2011 · Biochemistry (Eaton)

OSTI ID:1041949

Tremblay, L; Xu, h; Blanchard, J

The genome of Mycobacterium tuberculosis (TB) contains a gene that encodes a highly active {beta}-lactamase, BlaC, that imparts TB with resistance to {beta}-lactam chemotherapy. The structure of covalent BlaC-{beta}-lactam complexes suggests that active site residues K73 and E166 are essential for acylation and deacylation, respectively. We have prepared the K73A and E166A mutant forms of BlaC and have determined the structures of the Michaelis complex of cefamandole and the covalently bound acyl intermediate of cefamandole at resolutions of 1.2 and 2.0 {angstrom}, respectively. These structures provide insight into the details of the catalytic mechanism.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 1041949
• Report Number(s): BNL-97627-2012-JA; BICHAW; TRN: US201212%%360
• Journal Information: Biochemistry (Eaton), Vol. 49, Issue 45; ISSN 0006-2960
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
60 APPLIED LIFE SCIENCES
ACYLATION
CHEMOTHERAPY
GENES
MUTANTS
MYCOBACTERIUM TUBERCULOSIS
RESIDUES