1MD8

Monomeric structure of the active catalytic domain of complement protease C1r


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Monomeric structures of the zymogen and active catalytic domain of complement protease c1r: further insights into the c1 activation mechanism

Budayova-Spano, M.Grabarse, W.Thielens, N.M.Hillen, H.Lacroix, M.Schmidt, M.Fontecilla-Camps, J.Arlaud, G.J.Gaboriaud, C.

(2002) Structure 10: 1509-1519

  • Primary Citation of Related Structures:  1MD7

  • PubMed Abstract: 
  • C1r is the serine protease (SP) that mediates autoactivation of C1, the complex that triggers the classical complement pathway. We have determined the crystal structure of two fragments from the human C1r catalytic domain, each encompassing the secon ...

    C1r is the serine protease (SP) that mediates autoactivation of C1, the complex that triggers the classical complement pathway. We have determined the crystal structure of two fragments from the human C1r catalytic domain, each encompassing the second complement control protein (CCP2) module and the SP domain. The wild-type species has an active structure, whereas the S637A mutant is a zymogen. The structures reveal a restricted hinge flexibility of the CCP2-SP interface, and both are characterized by the unique alpha-helical conformation of loop E. The zymogen activation domain exhibits high mobility, and the active structure shows a restricted access to most substrate binding subsites. Further implications relevant to the C1r self-activation process are derived from protein-protein interactions in the crystals.


    Organizational Affiliation

    LCCP, Institut de Biologie Structurale Jean-Pierre Ebel, CEA-CNRS, 41 rue Jules Horowitz, Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
C1R COMPLEMENT SERINE PROTEASE
A
329Homo sapiensGene Names: C1R
EC: 3.4.21.41
Find proteins for P00736 (Homo sapiens)
Go to Gene View: C1R
Go to UniProtKB:  P00736
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 112.911α = 90.00
b = 49.459β = 106.19
c = 77.249γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
AMoREphasing
CNSrefinement
CCP4data scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-08-07
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance