1EA7

Sphericase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.93 Å
  • R-Value Free: 0.116 
  • R-Value Observed: 0.097 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The 0.93A Crystal Structure of Sphericase: A Calcium-Loaded Serine Protease from Bacillus Sphaericus

Almog, O.Gonzalez, A.Klein, D.Greenblat, H.M.Braun, S.Shoham, G.

(2003) J Mol Biol 332: 1071

  • DOI: 10.1016/j.jmb.2003.07.011
  • Primary Citation of Related Structures:  
    1EA7

  • PubMed Abstract: 
  • We have previously isolated sphericase (Sph), an extracellular mesophilic serine protease produced by Bacillus sphaericus. The Sph amino acid sequence is highly homologous to two cold-adapted subtilisins from Antarctic bacilli S39 and S41 (76% and 74% identity, respectively) ...

    We have previously isolated sphericase (Sph), an extracellular mesophilic serine protease produced by Bacillus sphaericus. The Sph amino acid sequence is highly homologous to two cold-adapted subtilisins from Antarctic bacilli S39 and S41 (76% and 74% identity, respectively). Sph is calcium-dependent, 310 amino acid residues long and has optimal activity at pH 10.0. S41 and S39 have not as yet been structurally analysed. In the present work, we determined the crystal structure of Sph by the Eu/multiwavelength anomalous diffraction method. The structure was extended to 0.93A resolution and refined to a crystallographic R-factor of 9.7%. The final model included all 310 amino acid residues, one disulfide bond, 679 water molecules and five calcium ions. Although Sph is a mesophilic subtilisin, its amino acid sequence is similar to that of the psychrophilic subtilisins, which suggests that the crystal structure of these subtilisins is very similar. The presence of five calcium ions bound to a subtilisin molecule, as found here for Sph, has not been reported for the subtilisin superfamily. None of these calcium-binding sites correlates with the well-known high-affinity calcium-binding site (site I or site A), and only one site has been described previously. This calcium-binding pattern suggests that a reduction in the flexibility of the surface loops of Sph by calcium binding may be responsible for its adaptation to mesophilic organisms.


    Organizational Affiliation

    Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University, Beer Sheva, 84105, Israel. almogo@bgumail.bgu.ac.il



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SERINE PROTEASEA310Lysinibacillus sphaericusMutation(s): 0 
UniProt
Find proteins for Q9S3L6 (Lysinibacillus sphaericus)
Explore Q9S3L6 
Go to UniProtKB:  Q9S3L6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9S3L6
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
OSE
Query on OSE
A L-PEPTIDE LINKINGC3 H7 N O6 SSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.93 Å
  • R-Value Free: 0.116 
  • R-Value Observed: 0.097 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.28α = 90
b = 62.38β = 114.31
c = 46.12γ = 90
Software Package:
Software NamePurpose
SHELXL-97refinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-07-04
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection, Derived calculations