1ELV

CRYSTAL STRUCTURE OF THE CATALYTIC DOMAIN OF HUMAN COMPLEMENT C1S PROTEASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Crystal structure of the catalytic domain of human complement c1s: a serine protease with a handle.

Gaboriaud, C.Rossi, V.Bally, I.Arlaud, G.J.Fontecilla-Camps, J.C.

(2000) EMBO J. 19: 1755-1765

  • DOI: 10.1093/emboj/19.8.1755

  • PubMed Abstract: 
  • C1s is the highly specific modular serine protease that mediates the proteolytic activity of the C1 complex and thereby triggers activation of the complement cascade. The crystal structure of a catalytic fragment from human C1s comprising the second ...

    C1s is the highly specific modular serine protease that mediates the proteolytic activity of the C1 complex and thereby triggers activation of the complement cascade. The crystal structure of a catalytic fragment from human C1s comprising the second complement control protein (CCP2) module and the chymotrypsin-like serine protease (SP) domain has been determined and refined to 1.7 A resolution. In the areas surrounding the active site, the SP structure reveals a restricted access to subsidiary substrate binding sites that could be responsible for the narrow specificity of C1s. The ellipsoidal CCP2 module is oriented perpendicularly to the surface of the SP domain. This arrangement is maintained through a rigid module-domain interface involving intertwined proline- and tyrosine-rich polypeptide segments. The relative orientation of SP and CCP2 is consistent with the fact that the latter provides additional substrate recognition sites for the C4 substrate. This structure provides a first example of a CCP-SP assembly that is conserved in diverse extracellular proteins. Its implications in the activation mechanism of C1 are discussed.


    Organizational Affiliation

    LCCP and LEM, Institut de Biologie Structurale J.-P.EbelCEA-CNRS, 41, rue Jules Horowitz, 38027 Grenoble Cedex 1, France. chris@lccp.ibs.fr




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
COMPLEMENT C1S COMPONENT
A
333Homo sapiensGene Names: C1S
EC: 3.4.21.42
Find proteins for P09871 (Homo sapiens)
Go to Gene View: C1S
Go to UniProtKB:  P09871
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NES
Query on NES

Download SDF File 
Download CCD File 
A
2-(2-HYDROXY-1,1-DIHYDROXYMETHYL-ETHYLAMINO)-ETHANESULFONIC ACID
C6 H15 N O6 S
JOCBASBOOFNAJA-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
FUC
Query on FUC

Download SDF File 
Download CCD File 
A
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 39.080α = 90.00
b = 79.650β = 91.24
c = 60.210γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
WARPmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-04
    Type: Advisory, Refinement description
  • Version 1.4: 2018-02-14
    Type: Experimental preparation