1DD6

IMP-1 METALLO BETA-LACTAMASE FROM PSEUDOMONAS AERUGINOSA IN COMPLEX WITH A MERCAPTOCARBOXYLATE INHIBITOR

DOI: 10.2210/pdb1DD6/pdb

Classification: HYDROLASE
Organism(s): Pseudomonas aeruginosa
Expression System: Escherichia coli BL21
Mutation(s): No

Deposited: 1999-11-08 Released: 2000-11-08
Deposition Author(s): Concha, N.O., Janson, C.A., Rowling, P., Pearson, S., Cheever, C.A., Clarke, B.P., Lewis, C., Galleni, M., Frere, J.M., Payne, D.J., Bateson, J.H., Abdel-Meguid, S.S.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.00 Å
R-Value Free: 0.259
R-Value Work: 0.198
R-Value Observed: 0.198

wwPDB Validation 3D Report Full Report

This is version 1.4 of the entry. See complete history.

Literature

Crystal structure of the IMP-1 metallo beta-lactamase from Pseudomonas aeruginosa and its complex with a mercaptocarboxylate inhibitor: binding determinants of a potent, broad-spectrum inhibitor.

Concha, N.O., Janson, C.A., Rowling, P., Pearson, S., Cheever, C.A., Clarke, B.P., Lewis, C., Galleni, M., Frere, J.M., Payne, D.J., Bateson, J.H., Abdel-Meguid, S.S.

(2000) Biochemistry 39: 4288-4298

PubMed: 10757977 Search on PubMed
DOI: 10.1021/bi992569m
Primary Citation of Related Structures:
1DDK, 1DD6

PubMed Abstract:

Metallo beta-lactamase enzymes confer antibiotic resistance to bacteria by catalyzing the hydrolysis of beta-lactam antibiotics. This relatively new form of resistance is spreading unchallenged as there is a current lack of potent and selective inhibitors of metallo beta-lactamases. Reported here are the crystal structures of the native IMP-1 metallo beta-lactamase from Pseudomonas aeruginosa and its complex with a mercaptocarboxylate inhibitor, 2-[5-(1-tetrazolylmethyl)thien-3-yl]-N-[2-(mercaptomethyl)-4 -(phenylb utyrylglycine)]. The structures were determined by molecular replacement, and refined to 3.1 A (native) and 2.0 A (complex) resolution. Binding of the inhibitor in the active site induces a conformational change that results in closing of the flap and transforms the active site groove into a tunnel-shaped cavity enclosing 83% of the solvent accessible surface area of the inhibitor. The inhibitor binds in the active site through interactions with residues that are conserved among metallo beta-lactamases; the inhibitor's carboxylate group interacts with Lys161, and the main chain amide nitrogen of Asn167. In the "oxyanion hole", the amide carbonyl oxygen of the inhibitor interacts through a water molecule with the side chain of Asn167, the inhibitor's thiolate bridges the two Zn(II) ions in the active site displacing the bridging water, and the phenylbutyryl side chain binds in a hydrophobic pocket (S1) at the base of the flap. The flap is displaced 2.9 A compared to the unbound structure, allowing Trp28 to interact edge-to-face with the inhibitor's thiophene ring. The similarities between this inhibitor and the beta-lactam substrates suggest a mode of substrate binding and the role of the conserved residues in the active site. It appears that the metallo beta-lactamases bind their substrates by establishing a subset of binding interactions near the catalytic center with conserved characteristic chemical groups of the beta-lactam substrates. These interactions are complemented by additional nonspecific binding between the more variable groups in the substrates and the flexible flap. This unique mode of binding of the mercaptocarboxylate inhibitor in the enzyme active site provides a binding model for metallo beta-lactamase inhibition with utility for future drug design.

Organizational Affiliation:

Department of Structural Biology, SmithKline Beecham Pharmaceuticals, 709 Swedeland Road, King of Prussia, Pennsylvania 19406, USA. nestor_o_concha@sbphrd.com

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
IMP-1 METALLO BETA-LACTAMASE	A, B	228	Pseudomonas aeruginosa	Mutation(s): 0 EC: 3.5.2.6
Find proteins for P52699 (Serratia marcescens) Explore P52699 Go to UniProtKB: P52699
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
MCI Query on MCI Download Ideal Coordinates CCD File SDF format, chain F [A] SDF format, chain I [B] MOL2 format, chain F [A] MOL2 format, chain I [B]	A, B	(2-MERCAPTOMETHYL-4-PHENYL-BUTYRYLIMINO)-(5-TETRAZOL-1-YLMETHYL-THIOPHEN-2-YL)-ACETIC ACID C₁₉ H₁₉ N₅ O₃ S₂ DUKDFMPUZRDWLT-CQSZACIVSA-N		Ligand Interaction
SO4 Query on SO4 Download Ideal Coordinates CCD File SDF format, chain C [A] MOL2 format, chain C [A]	A	SULFATE ION O₄ S QAOWNCQODCNURD-UHFFFAOYSA-L		Ligand Interaction
ZN Query on ZN Download Ideal Coordinates CCD File SDF format, chain D [A] SDF format, chain E [A] SDF format, chain G [B] SDF format, chain H [B] MOL2 format, chain D [A] MOL2 format, chain E [A] MOL2 format, chain G [B] MOL2 format, chain H [B]	A, B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N		Ligand Interaction