The von Willebrand Factor A3 domain binding region of type III collagen stabilized by the cysteine knot

Experimental Data Snapshot

  • Resolution: 1.49 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.180 

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The NC2 Domain of Type IX Collagen Determines the Chain Register of the Triple Helix.

Boudko, S.P.Bachinger, H.P.

(2012) J Biol Chem 287: 44536-44545

  • DOI: https://doi.org/10.1074/jbc.M112.417543
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Precise mapping and unraveling the mechanism of interaction or degradation of a certain type of collagen triple helix requires the generation of short and stable collagenous fragments. This is a great challenge especially for hetero-trimeric collagens, where chain composition and register (stagger) are important factors. No system has been reported that can be efficiently used to generate a natural collagenous fragment with exact chain composition and desired chain register. The NC2 domain (only 35-50 residues) of FACIT collagens is a potent trimerization domain. In the case of type IX collagen it provides the efficient selection and hetero-trimerization of three distinct chains. The ability of the NC2 domain to determine the chain register of the triple helix is studied. We generated three possible sequence combinations (α1α1α2, α1α2α1, α2α1α1) of a type I collagen fragment (the binding region for the von Willebrand factor A3 domain) attached to the NC2 domain. In addition, two control combinations were produced that constitute homo-trimers of (α1)(3) or (α2)(3). For the hetero-trimeric constructs, α1α1α2 demonstrated a higher melting temperature than the other two. Binding experiments with the von Willebrand factor A3 domain revealed the homo-trimer of (α1)(3) as the strongest binding construct, whereas the homo-trimer of (α2)(3) showed no binding. For hetero-trimers, α1α1α2 was found to be the strongest binding construct. Differences in thermal stability and binding to the A3 domain unambiguously demonstrate that the NC2 domain of type IX collagen determines not only the chain composition but also the chain register of the adjacent triple helix.

  • Organizational Affiliation

    Research Department, Shriners Hospital for Children, Portland, Oregan 97239, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Type III collagen fragment in a host peptide stabilized by the cysteine knot
A, B, C
31Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P02461 (Homo sapiens)
Explore P02461 
Go to UniProtKB:  P02461
PHAROS:  P02461
GTEx:  ENSG00000168542 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02461
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on HYP
A, B, C
Experimental Data & Validation

Experimental Data

  • Resolution: 1.49 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.180 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 19.07α = 90
b = 26.99β = 92.48
c = 64.12γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-17
    Type: Initial release
  • Version 1.1: 2012-11-21
    Changes: Database references
  • Version 1.2: 2013-01-16
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Refinement description
  • Version 1.4: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description