1NZI

Crystal Structure of the CUB1-EGF Interaction Domain of Complement Protease C1s


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.217 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

X-ray structure of the Ca2+-binding interaction domain of C1s. Insights into the assembly of the C1 complex of complement

Gregory, L.A.Thielens, N.M.Arlaud, G.J.Fontecilla-Camps, J.C.Gaboriaud, C.

(2003) J Biol Chem 278: 32157-32164

  • DOI: https://doi.org/10.1074/jbc.M305175200
  • Primary Citation of Related Structures:  
    1NZI

  • PubMed Abstract: 

    C1, the complex that triggers the classical pathway of complement, is assembled from two modular proteases C1r and C1s and a recognition protein C1q. The N-terminal CUB1-EGF segments of C1r and C1s are key elements of the C1 architecture, because they mediate both Ca2+-dependent C1r-C1s association and interaction with C1q. The crystal structure of the interaction domain of C1s has been solved and refined to 1.5 A resolution. The structure reveals a head-to-tail homodimer involving interactions between the CUB1 module of one monomer and the epidermal growth factor (EGF) module of its counterpart. A Ca2+ ion is bound to each EGF module and stabilizes both the intra- and inter-monomer interfaces. Unexpectedly, a second Ca2+ ion is bound to the distal end of each CUB1 module, through six ligands contributed by Glu45, Asp53, Asp98, and two water molecules. These acidic residues and Tyr17 are conserved in approximately two-thirds of the CUB repertoire and define a novel, Ca2+-binding CUB module subset. The C1s structure was used to build a model of the C1r-C1s CUB1-EGF heterodimer, which in C1 connects C1r to C1s and mediates interaction with C1q. A structural model of the C1q/C1r/C1s interface is proposed, where the rod-like collagen triple helix of C1q is accommodated into a groove along the transversal axis of the C1r-C1s heterodimer.


  • Organizational Affiliation

    Laboratoire de Cristallographie et Cristallogénèse des Protéines, Institut de Biologie Structurale Jean-Pierre Ebel, 41 rue Jules Horowitz, 38027 Grenoble Cedex 1, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Complement C1s component
A, B
159Homo sapiensMutation(s): 0 
Gene Names: C1S
EC: 3.4.21.42
UniProt & NIH Common Fund Data Resources
Find proteins for P09871 (Homo sapiens)
Explore P09871 
Go to UniProtKB:  P09871
PHAROS:  P09871
GTEx:  ENSG00000182326 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09871
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.217 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.134α = 87.74
b = 47.499β = 78.04
c = 56.679γ = 75.67
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement
CCP4data scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-06-10
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-10-23
    Changes: Data collection, Database references, Derived calculations, Structure summary