2Q3Z

Transglutaminase 2 undergoes large conformational change upon activation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Transglutaminase 2 undergoes a large conformational change upon activation

Pinkas, D.M.Strop, P.Brunger, A.T.Khosla, C.

(2007) Plos Biol. 5: e327-e327

  • DOI: 10.1371/journal.pbio.0050327

  • PubMed Abstract: 
  • Human transglutaminase 2 (TG2), a member of a large family of enzymes that catalyze protein crosslinking, plays an important role in the extracellular matrix biology of many tissues and is implicated in the gluten-induced pathogenesis of celiac sprue ...

    Human transglutaminase 2 (TG2), a member of a large family of enzymes that catalyze protein crosslinking, plays an important role in the extracellular matrix biology of many tissues and is implicated in the gluten-induced pathogenesis of celiac sprue. Although vertebrate transglutaminases have been studied extensively, thus far all structurally characterized members of this family have been crystallized in conformations with inaccessible active sites. We have trapped human TG2 in complex with an inhibitor that mimics inflammatory gluten peptide substrates and have solved, at 2-A resolution, its x-ray crystal structure. The inhibitor stabilizes TG2 in an extended conformation that is dramatically different from earlier transglutaminase structures. The active site is exposed, revealing that catalysis takes place in a tunnel, bridged by two tryptophan residues that separate acyl-donor from acyl-acceptor and stabilize the tetrahedral reaction intermediates. Site-directed mutagenesis was used to investigate the acyl-acceptor side of the tunnel, yielding mutants with a marked increase in preference for hydrolysis over transamidation. By providing the ability to visualize this activated conformer, our results create a foundation for understanding the catalytic as well as the non-catalytic roles of TG2 in biology, and for dissecting the process by which the autoantibody response to TG2 is induced in celiac sprue patients.


    Organizational Affiliation

    Department of Chemical Engineering, Stanford University, Stanford, California, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transglutaminase 2
A
687Homo sapiensMutation(s): 0 
Gene Names: TGM2
EC: 2.3.2.13
Find proteins for P21980 (Homo sapiens)
Go to Gene View: TGM2
Go to UniProtKB:  P21980
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Polypeptide
X
7N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
X
NON-POLYMERH2 N

--

ONL
Query on ONL
X
L-PEPTIDE LINKINGC6 H11 N O3

--

ACE
Query on ACE
X
NON-POLYMERC2 H4 O

--

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.228 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 71.671α = 90.00
b = 71.671β = 90.00
c = 309.010γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALEPACKdata scaling
DENZOdata reduction
PDB_EXTRACTdata extraction
Blu-Icedata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Derived calculations, Version format compliance
  • Version 1.2: 2017-10-18
    Type: Advisory, Refinement description
  • Version 1.3: 2018-02-14
    Type: Experimental preparation