Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 34000.19 
• Atom Count: 2392 
• Residue Count: 317 
• Unique protein chains: 1

1ESP

NEUTRAL PROTEASE MUTANT E144S

• DOI: 10.2210/pdb1ESP/pdb

• Classification: HYDROLASE (METALLOPROTEINASE)
• Organism(s): Bacillus cereus
• Expression System: Bacillus subtilis
• Mutation(s): 1 


• Deposited: 1995-08-11 Released: 1995-12-07 
• Deposition Author(s): Litster, S.A., Wetmore, D.R., Roche, R.S., Codding, P.W.

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Experimental Data Snapshot

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

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

• PubMed: 15299677 
• 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mutant E144S, in which the putative general base proposed for the thermolysin-like zinc neutral proteases, Glu144, has been replaced by serine, has been determined to a resolution of 2.8 A. This represents the first crystal structure of an active-site mutant of a zinc neutral protease.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.

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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




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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
NEUTRAL PROTEASE MUTANT E144S	A	317	Bacillus cereus	Mutation(s): 1  Gene Names: npr (nprC) EC: 3.4.24.28
Find proteins for P05806 (Bacillus cereus) Go to UniProtKB:  P05806

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

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 = 76.570	α = 90.00
b = 76.570	β = 90.00
c = 201.910	γ = 120.00

Software Package:

Software Name	Purpose
MADNESS	data reduction
X-PLOR	phasing
X-PLOR	refinement
X-PLOR	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-08-11 
• Released Date: 1995-12-07 
• Deposition Author(s): Litster, S.A., Wetmore, D.R., Roche, R.S., Codding, P.W.

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
• Version 1.3: 2018-04-18
  Type: Data collection, Other