4B0F

Heptameric core complex structure of C4b-binding (C4BP) protein from human


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Arranged Sevenfold: Structural Insights Into the C-Terminal Oligomerization Domain of Human C4B-Binding Protein.

Hofmeyer, T.Schmelz, S.Degiacomi, M.T.Peraro, M.D.Daneschdar, M.Scrima, A.Den Heuvel, J.V.Heinz, D.W.Kolmar, H.

(2013) J.Mol.Biol. 425: 1302

  • DOI: 10.1016/j.jmb.2012.12.017

  • PubMed Abstract: 
  • The complement system as a major part of innate immunity is the first line of defense against invading microorganisms. Orchestrated by more than 60 proteins, its major task is to discriminate between host cells and pathogens and to initiate immune re ...

    The complement system as a major part of innate immunity is the first line of defense against invading microorganisms. Orchestrated by more than 60 proteins, its major task is to discriminate between host cells and pathogens and to initiate immune response. Additional recognition of necrotic or apoptotic cells demands a fine-tune regulation of this powerful system. C4b-binding protein (C4BP) is the major inhibitor of the classical complement and lectin pathway. The crystal structure of the human C4BP oligomerization domain in its 7α isoform and molecular simulations provide first structural insights of C4BP oligomerization. The heptameric core structure is stabilized by intermolecular disulfide bonds. In addition, thermal shift assays indicate that layers of electrostatic interactions mainly contribute to the extraordinary thermodynamic stability of the complex. These findings make C4BP a promising scaffold for multivalent ligand display with applications in immunology and biological chemistry.


    Organizational Affiliation

    Institute for Organic Chemistry and Biochemistry, Technische Universität Darmstadt, Petersenstraße 22, 64287 Darmstadt, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
C4B-BINDING PROTEIN ALPHA CHAIN
A, B, C, D, E, F, G
65Homo sapiensMutation(s): 0 
Gene Names: C4BPA (C4BP)
Find proteins for P04003 (Homo sapiens)
Go to Gene View: C4BPA
Go to UniProtKB:  P04003
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
B, C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D, E, F, G
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.212 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 73.850α = 90.00
b = 73.850β = 90.00
c = 204.290γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction
PHENIXrefinement
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-01-09
    Type: Initial release
  • Version 1.1: 2013-04-10
    Type: Database references
  • Version 1.2: 2017-07-12
    Type: Refinement description