1SRA

STRUCTURE OF A NOVEL EXTRACELLULAR CA2+-BINDING MODULE IN BM-40(SLASH)SPARC(SLASH)OSTEONECTIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a novel extracellular Ca(2+)-binding module in BM-40.

Hohenester, E.Maurer, P.Hohenadl, C.Timpl, R.Jansonius, J.N.Engel, J.

(1996) Nat.Struct.Mol.Biol. 3: 67-73


  • PubMed Abstract: 
  • The EF-hand is a highly conserved Ca(2+)-binding motif found in many cytosolic Ca(2+)-modulated proteins. Here we report the crystal structure at 2.0 A resolution of the carboxy-terminal domain of human BM-40 (SPARC, osteonectin), an extracellular ma ...

    The EF-hand is a highly conserved Ca(2+)-binding motif found in many cytosolic Ca(2+)-modulated proteins. Here we report the crystal structure at 2.0 A resolution of the carboxy-terminal domain of human BM-40 (SPARC, osteonectin), an extracellular matrix protein containing an EF-hand pair. The two EF-hands interact canonically but their detailed structures are unusual. In the first EF-hand a one-residue insertion is accommodated by a cis-peptide bond and by substituting a carboxylate by a peptide carbonyl as a Ca2+ ligand. The second EF-hand is stabilized by a disulphide bond. The EF-hand pair interacts tightly with an amphiphilic amino-terminal helix, reminiscent of target peptide binding by calmodulin. The present structure defines a novel protein module occurring in several other extracellular proteins.


    Related Citations: 
    • The Biology of Sparc, a Protein that Modulates Cell-Matrix Interactions
      Lane, T.F.,Sage, E.H.
      (1994) Faseb J. 8: 163
    • The C-Terminal Portion of Bm-40 (Sparc(Slash)Osteonectin) is an Autonomously Folding and Crystallisable Domain that Binds Calcium and Collagen Iv
      Maurer, P.,Hohenadl, C.,Hohenester, E.,Gohring, W.,Timpl, R.,Engel, J.
      (1995) J.Mol.Biol. 253: 347


    Organizational Affiliation

    Department of Structural Biology, University of Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SPARC
A
151Homo sapiensMutation(s): 0 
Gene Names: SPARC (ON)
Find proteins for P09486 (Homo sapiens)
Go to Gene View: SPARC
Go to UniProtKB:  P09486
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
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 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 54.700α = 90.00
b = 55.200β = 90.00
c = 75.500γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-03-08
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance