3lce

From Proteopedia

Crystal Structure of Oxa-10 Beta-Lactamase Covalently Bound to Cyclobutanone Beta-Lactam Mimic

PDB ID 3lce

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Structural highlights

3lce is a 4 chain structure with sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2Å
Ligands:	, , ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

BLO10_PSEAI Hydrolyzes both carbenicillin and oxacillin.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The most important mode of bacterial resistance to beta-lactam antibiotics is the expression of beta-lactamases. New cyclobutanone analogues of penams and penems have been prepared and evaluated for inhibition of class A, B, C, and D beta-lactamases. Inhibitors which favor conformations in which the C4 carboxylate is equatorial were found to be more potent than those in which the carboxylate is axial, and molecular modeling studies with enzyme-inhibitor complexes indicate that an equatorial orientation of the carboxylate is required for binding to beta-lactamases. An X-ray structure of OXA-10 complexed with a cyclobutanone confirms that a serine hemiketal is formed in the active site and that the inhibitor adopts the exo envelope. An unsaturated penem analogue was also found to enhance the potency of meropenem against carbapenem-resistant MBL-producing strains of Chryseobacterium meningosepticum and Stenotrophomonas maltophilia. These cyclobutanones represent the first type of reversible inhibitors to show moderate (low micromolar) inhibition of both serine- and metallo-beta-lactamases and should be considered for further development into practical inhibitors.

Cyclobutanone analogues of beta-lactams revisited: insights into conformational requirements for inhibition of serine- and metallo-beta-lactamases.,Johnson JW, Gretes M, Goodfellow VJ, Marrone L, Heynen ML, Strynadka NC, Dmitrienko GI J Am Chem Soc. 2010 Mar 3;132(8):2558-60. PMID:20141132^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Johnson JW, Gretes M, Goodfellow VJ, Marrone L, Heynen ML, Strynadka NC, Dmitrienko GI. Cyclobutanone analogues of beta-lactams revisited: insights into conformational requirements for inhibition of serine- and metallo-beta-lactamases. J Am Chem Soc. 2010 Mar 3;132(8):2558-60. PMID:20141132 doi:10.1021/ja9086374