2WNO

X-ray Structure of CUB_C domain from TSG-6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Metal Ion-Dependent Heavy Chain Transfer Activity of Tsg-6 Mediates Assembly of the Cumulus-Oocyte Matrix.

Briggs, D.C.Birchenough, H.L.Ali, T.Rugg, M.S.Waltho, J.P.Ievoli, E.Jowitt, T.A.Enghild, J.J.Richter, R.P.Salustri, A.Milner, C.M.Day, A.J.

(2015) J.Biol.Chem. 290: 28708

  • DOI: 10.1074/jbc.M115.669838

  • PubMed Abstract: 
  • The matrix polysaccharide hyaluronan (HA) has a critical role in the expansion of the cumulus cell-oocyte complex (COC), a process that is necessary for ovulation and fertilization in most mammals. Hyaluronan is organized into a cross-linked network ...

    The matrix polysaccharide hyaluronan (HA) has a critical role in the expansion of the cumulus cell-oocyte complex (COC), a process that is necessary for ovulation and fertilization in most mammals. Hyaluronan is organized into a cross-linked network by the cooperative action of three proteins, inter-α-inhibitor (IαI), pentraxin-3, and TNF-stimulated gene-6 (TSG-6), driving the expansion of the COC and providing the cumulus matrix with its required viscoelastic properties. Although it is known that matrix stabilization involves the TSG-6-mediated transfer of IαI heavy chains (HCs) onto hyaluronan (to form covalent HC·HA complexes that are cross-linked by pentraxin-3) and that this occurs via the formation of covalent HC·TSG-6 intermediates, the underlying molecular mechanisms are not well understood. Here, we have determined the tertiary structure of the CUB module from human TSG-6, identifying a calcium ion-binding site and chelating glutamic acid residue that mediate the formation of HC·TSG-6. This occurs via an initial metal ion-dependent, non-covalent, interaction between TSG-6 and HCs that also requires the presence of an HC-associated magnesium ion. In addition, we have found that the well characterized hyaluronan-binding site in the TSG-6 Link module is not used for recognition during transfer of HCs onto HA. Analysis of TSG-6 mutants (with impaired transferase and/or hyaluronan-binding functions) revealed that although the TSG-6-mediated formation of HC·HA complexes is essential for the expansion of mouse COCs in vitro, the hyaluronan-binding function of TSG-6 does not play a major role in the stabilization of the murine cumulus matrix.


    Organizational Affiliation

    From the Wellcome Trust Centre for Cell-Matrix Research and the Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TUMOR NECROSIS FACTOR-INDUCIBLE GENE 6 PROTEIN
A
149Homo sapiensMutation(s): 0 
Gene Names: TNFAIP6 (TSG6)
Find proteins for P98066 (Homo sapiens)
Go to Gene View: TNFAIP6
Go to UniProtKB:  P98066
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CO
Query on CO

Download SDF File 
Download CCD File 
A
COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.191 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 56.929α = 90.00
b = 56.929β = 90.00
c = 112.572γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
MOLREPphasing
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-09-01
    Type: Initial release
  • Version 1.1: 2015-10-21
    Type: Database references, Other, Version format compliance
  • Version 1.2: 2015-10-28
    Type: Database references
  • Version 1.3: 2015-12-09
    Type: Database references
  • Version 1.4: 2017-06-28
    Type: Data collection