Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.178 

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E144S active-site mutant of the Bacillus cereus thermolysin-like neutral protease at 2.8 A resolution.

Lister, S.A.Wetmore, D.R.Roche, R.S.Codding, P.W.

(1996) Acta Crystallogr D Biol Crystallogr 52: 543-550

  • DOI: https://doi.org/10.1107/S0907444995016684
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The X-ray crystal structure of the Bacillus cereus neutral protease (CNP) active-site mutant E144S, in which the putative general base proposed for the thermolysin-like zinc neutral proteases, Glu144, has been replaced by serine, has been determined to a resolution of 2.8 A. This represents the first crystal structure of an active-site mutant of a zinc neutral protease. The E 144S mutant was crystallized in the hexagonal space group, P6(5)22, with unit-cell dimensions a = b = 76.57, c = 201.91 A. Although the ligands involved in zinc coordination in the active site are identical to those found in the wild-type protein, the mutation results in a modified environment around the zinc ion; particularly with respect to the water molecules. While the structure of the mutant is similar to that of wild type, its protease activity is reduced to 0.16% that of the wild-type CNP and the protein is virtually resistant to autolysis in the presence of calcium. The lowered protease activity of the mutant is consistent with the role proposed for Glu144 as the general base in the catalysis of thermolysin-like neutral proteases [Matthews (1988). Acc. Chem. Res. 21, 333-340]. We suggest that the residual activity of the E144S mutant arises from a water molecule, which is found within hydrogen-bonding distance of Ser144, acting as a general base in the catalytic function of the mutant.

  • Organizational Affiliation

    Department of Chemistry, University of Calgary, Alberta, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NEUTRAL PROTEASE MUTANT E144S317Bacillus cereusMutation(s): 1 
Find proteins for P05806 (Bacillus cereus)
Explore P05806 
Go to UniProtKB:  P05806
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05806
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.178 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.57α = 90
b = 76.57β = 90
c = 201.91γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
MADNESSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-12-07
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-18
    Changes: Data collection, Other
  • Version 1.4: 2021-11-03
    Changes: Database references, Derived calculations
  • Version 1.5: 2024-02-07
    Changes: Data collection