Download MendeleyInhibition of the SHV-1 beta-lactamase by sulfones: crystallographic observation of two reaction intermediates with tazobactam.
Kuzin, A.P., Nukaga, M., Nukaga, Y., Hujer, A., Bonomo, R.A., Knox, J.R.(2001) Biochemistry 40: 1861-1866
- PubMed: 11327849
- DOI: https://doi.org/10.1021/bi0022745
- Primary Citation of Related Structures:
1VM1 - PubMed Abstract:
Two species resulting from the reaction of the SHV-1 class A beta-lactamase with the sulfone inhibitor tazobactam have been trapped at 100 K and mapped by X-ray crystallography at 2.0 A resolution. An acyclic form of tazobactam is covalently bonded to the catalytic Ser70 side chain, and a second species, a five-atom vinyl carboxylic acid fragment of tazobactam, is bonded to Ser130. It is proposed that the electron density map of the crystal is a composite picture of two complexes, each with only a single bound species. It is estimated that the two complexes exist in the crystal in approximately equal populations. Results are discussed in relation to the mechanism-based inhibition of class A beta-lactamases by the similar inhibitors sulbactam and clavulanic acid.
Organizational Affiliation:
Department of Molecular and Cell Biology, The University of Connecticut, Storrs, CT 06269-3125, USA.
