The Structure of a Triple Mutant of the Tiam1 PH-CC-Ex Domain

Experimental Data Snapshot

  • Resolution: 2.15 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 

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High-resolution structure of the Tiam1 PHn-CC-Ex domain.

Joshi, M.Gakhar, L.Fuentes, E.J.

(2013) Acta Crystallogr Sect F Struct Biol Cryst Commun 69: 744-752

  • DOI: https://doi.org/10.1107/S1744309113014206
  • Primary Citation of Related Structures:  
    4K2O, 4K2P

  • PubMed Abstract: 

    The T-lymphoma and metastasis gene 1 (TIAM1) encodes a guanine nucleotide-exchange factor protein (Tiam1) that is specific for the Rho-family GTPase Rac1 and is important for cell polarity, migration and adhesion. Tiam1 is a large multi-domain protein that contains several protein-protein binding domains that are important for regulating cellular function. The PHn-CC-Ex domain is critical for plasma-membrane association and interactions with protein-scaffold proteins (e.g. Par3b, spinophilin, IRSp53 and JIP2) that direct Tiam1-Rac1 signaling specificity. It was determined that the coiled-coil domain of Par3b binds the PHn-CC-Ex domain with a dissociation constant of ≈ 30 µM. Moreover, the structures of two variants of the Tiam1 PHn-CC-Ex domain were solved at resolutions of 1.98 and 2.15 Å, respectively. The structures indicate that the PHn, CC and Ex regions form independent subdomains that together provide an integrated platform for binding partner proteins. Small-angle X-ray scattering (SAXS) data indicate that the Tiam1 PHn-CC-Ex domain is monomeric in solution and that the solution and crystal structures are very similar. Together, these data provide the foundation necessary to elucidate the structural mechanism of the PHn-CC-Ex/scaffold interactions that are critical for Tiam1-Rac1 signaling specificity.

  • Organizational Affiliation

    Department of Biochemistry, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242-1109, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
T-lymphoma invasion and metastasis-inducing protein 1276Homo sapiensMutation(s): 3 
Gene Names: TIAM1
UniProt & NIH Common Fund Data Resources
Find proteins for Q13009 (Homo sapiens)
Explore Q13009 
Go to UniProtKB:  Q13009
PHAROS:  Q13009
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13009
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.15 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.831α = 90
b = 80.127β = 90
c = 97.905γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-07-10
    Type: Initial release
  • Version 1.1: 2013-09-11
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Refinement description