6M5H

A class C beta-lactamase mutant - Y150F


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.177 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Novel inhibition mechanism of carbapenems on the ACC-1 class C beta-lactamase.

Bae, D.W.Jung, Y.E.Jeong, B.G.Cha, S.S.

(2020) Arch Biochem Biophys 693: 108570-108570

  • DOI: https://doi.org/10.1016/j.abb.2020.108570
  • Primary Citation of Related Structures:  
    6M5H, 6M5P, 6M5Q

  • PubMed Abstract: 

    The hydrolysis of β-lactam antibiotics by class C β-lactamases proceeds through the acylation and the rate-determining deacylation steps mediated by the nucleophilic serine and the deacylation water, respectively. The pose of poor substrates such as carbapenems in the acylated enzyme is responsible for the low efficient deacylation reaction. Here we present the crystal structures of the Y150F variant of the ACC-1 class C β-lactamase in the apo and acylated states. In the acylated enzyme complexed with two carbapenems, imipenem and meropenem, the lactam carbonyl oxygen is located in the oxyanion hole. However, the five-membered pyrroline ring displays a novel orientation that has not been reported so far. The ring is rotated such that its C3 carboxylate makes salt bridges with Lys67 and Ly315, which is accompanied by the side-chain rotamer change of Phe150. The C3 carboxylate is placed where the deacylation water occupies in the apo-enzyme, which, together with the displacement of the catalytic base residue at position 150, explains why carbapenems are poor substrates of ACC-1.


  • Organizational Affiliation

    Department of Chemistry & Nanoscience, Ewha Womans University, Seoul, 03760, Republic of Korea.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-lactamase370Klebsiella pneumoniaeMutation(s): 1 
Gene Names: bla-ACC-1acc-1
EC: 3.5.2.6
UniProt
Find proteins for Q9XB24 (Klebsiella pneumoniae)
Explore Q9XB24 
Go to UniProtKB:  Q9XB24
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9XB24
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.177 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.15α = 90
b = 59.98β = 111.31
c = 55.1γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Research Foundation (NRF, Korea)Korea, Republic OfNRF-2015M1A5A1037480

Revision History  (Full details and data files)

  • Version 1.0: 2021-01-20
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Database references, Refinement description