1ESP

NEUTRAL PROTEASE MUTANT E144S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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.,Sect.D 52: 543-550

  • DOI: 10.1107/S0907444995016684

  • 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mutant E144S, in which the putative general base proposed for the thermolysin-like zinc neutral proteases, Glu144, has been replaced by serine, has been determined ...

    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mutant E144S, in which the putative general base proposed for the thermolysin-like zinc neutral proteases, Glu144, has been replaced by serine, has been determined to a resolution of 2.8 A. This represents the first crystal structure of an active-site mutant of a zinc neutral protease.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.


    Related Citations: 
    • The Structure of Neutral Protease from Bacillus Cereus at 0.2-Nm Resolution
      Stark, W.,Pauptit, R.A.,Wilson, K.S.,Jansonius, J.N.
      (1992) Eur.J.Biochem. 207: 781
    • Crystal Structure of Neutral Protease from Bacillus Cereus Refined at 3.0 Angstroms Resolution and Comparison with the Homologous But More Thermostable Enzyme Thermolysin
      Pauptit, R.A.,Karlson, R.,Picot, D.,Jenkins, J.A.,Niklaus-Reimer, A.,Jansonius, J.N.
      (1988) J.Mol.Biol. 199: 525


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NEUTRAL PROTEASE MUTANT E144S
A
317Bacillus cereusGene Names: npr (nprC)
EC: 3.4.24.28
Find proteins for P05806 (Bacillus cereus)
Go to UniProtKB:  P05806
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.178 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 76.570α = 90.00
b = 76.570β = 90.00
c = 201.910γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
MADNESSdata reduction
X-PLORrefinement
X-PLORmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-12-07
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance