Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 

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This is version 1.4 of the entry. See complete history


Structural basis for the guanine nucleotide-binding activity of tissue transglutaminase and its regulation of transamidation activity.

Liu, S.Cerione, R.A.Clardy, J.

(2002) Proc Natl Acad Sci U S A 99: 2743-2747

  • DOI: https://doi.org/10.1073/pnas.042454899
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Tissue transglutaminase (TG) is a Ca2+-dependent acyltransferase with roles in cellular differentiation, apoptosis, and other biological functions. In addition to being a transamidase, TG undergoes a GTP-binding/GTPase cycle even though it lacks any obvious sequence similarity with canonical GTP-binding (G) proteins. Guanine nucleotide binding and Ca2+ concentration reciprocally regulate TG's transamidation activity, with nucleotide binding being the negative regulator. Here we report the x-ray structure determined to 2.8-A resolution of human TG complexed with GDP. Although the transamidation active site is similar to those of other known transglutaminases, the guanine nucleotide-binding site of TG differs markedly from other G proteins. The structure suggests a structural basis for the negative regulation of transamidation activity by bound nucleotide, and the positive regulation of transamidation by Ca2+.

  • Organizational Affiliation

    Department of Chemistry, Cornell University, Ithaca, NY 14853, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein-glutamine gamma-glutamyltransferase
A, B, C, D, E
A, B, C, D, E, F
687Homo sapiensMutation(s): 0 
Gene Names: TGM2
EC: (PDB Primary Data), 3.4 (UniProt), (UniProt), 2.3.1 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P21980 (Homo sapiens)
Explore P21980 
Go to UniProtKB:  P21980
PHAROS:  P21980
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21980
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 132.479α = 90
b = 168.797β = 90
c = 238.568γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Experimental preparation
  • Version 1.4: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description