Metallo-beta-lactamase from Bacillus cereus 569/H/9 C168S mutant

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 

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This is version 1.4 of the entry. See complete history


Structural effects of the active site mutation cysteine to serine in Bacillus cereus zinc-beta-lactamase.

Chantalat, L.Duee, E.Galleni, M.Frere, J.M.Dideberg, O.

(2000) Protein Sci 9: 1402-1406

  • DOI: https://doi.org/10.1110/ps.9.7.1402
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Beta-lactamases are involved in bacterial resistance. Members of the metallo-enzyme class are now found in many pathogenic bacteria and are becoming thus of major clinical importance. Despite the availability of Zn-beta-lactamase X-ray structures their mechanism of action is still unclear. One puzzling observation is the presence of one or two zincs in the active site. To aid in assessing the role of zinc content in beta-lactam hydrolysis, the replacement by Ser of the zinc-liganding residue Cys168 in the Zn-beta-lactamase from Bacillus cereus strain 569/H/9 was carried out: the mutant enzyme (C168S) is inactive in the mono-Zn form, but active in the di-Zn form. The structure of the mono-Zn form of the C168S mutant has been determined at 1.85 A resolution. Ser168 occupies the same position as Cys168 in the wild-type enzyme. The protein residues mostly affected by the mutation are Asp90-Arg91 and His210. A critical factor for the activity of the mono-Zn species is the distance between Asp90 and the Zn ion, which is controlled by Arg91: a slight movement of Asp90 impairs catalysis. The evolution of a large superfamily including Zn-beta-lactamases suggests that they may not all share the same mechanism.

  • Organizational Affiliation

    Laboratoire de Cristallographie Macromoléculaire, Institut de Biologie Structurale Jean-Pierre Ebel, CNRS/CEA, Grenoble, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CLASS B BETA-LACTAMASE227Bacillus cereusMutation(s): 1 
Find proteins for P04190 (Bacillus cereus)
Explore P04190 
Go to UniProtKB:  P04190
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04190
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Query on BCT

Download Ideal Coordinates CCD File 
C H O3
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.79α = 90
b = 61.25β = 92.93
c = 69.28γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-25
    Type: Initial release
  • Version 1.1: 2014-02-05
    Changes: Derived calculations, Other, Source and taxonomy, Version format compliance
  • Version 1.2: 2018-10-24
    Changes: Advisory, Data collection, Source and taxonomy
  • Version 1.3: 2019-10-09
    Changes: Data collection, Database references
  • Version 1.4: 2023-12-06
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description