Crystal Structure of the Human GGA1 GAT domain

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 

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Crystal Structure of Human GGA1 GAT Domain

Zhu, G.Zhai, P.He, X.Terzyan, S.Zhang, R.Joachimiak, A.Tang, J.Zhang, X.C.

(2003) Biochemistry 42: 6392-6399

  • DOI: https://doi.org/10.1021/bi034334n
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    GGAs are a family of vesicle-coating regulatory proteins that function in intracellular protein transport. A GGA molecule contains four domains, each mediating interaction with other proteins in carrying out intracellular transport. The GAT domain of GGAs has been identified as the structural entity that binds membrane-bound ARF, a molecular switch regulating vesicle-coat assembly. It also directly interacts with rabaptin5, an essential component of endosome fusion. A 2.8 A resolution crystal structure of the human GGA1 GAT domain is reported here. The GAT domain contains four helices and has an elongated shape with the longest dimension exceeding 80 A. Its longest helix is involved in two structural motifs: an N-terminal helix-loop-helix motif and a C-terminal three-helix bundle. The N-terminal motif harbors the most conservative amino acid sequence in the GGA GAT domains. Within this conserved region, a cluster of residues previously implicated in ARF binding forms a hydrophobic surface patch, which is likely to be the ARF-binding site. In addition, a structure-based mutagenesis-biochemical analysis demonstrates that the C-terminal three-helix bundle of this GAT domain is responsible for the rabaptin5 binding. These structural characteristics are consistent with a model supporting multiple functional roles for the GAT domain.

  • Organizational Affiliation

    Crystallography Research Program and Protein Studies Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, Oklahoma 73104, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ADP-ribosylation factor binding protein GGA1186Homo sapiensMutation(s): 0 
Gene Names: GGA1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UJY5 (Homo sapiens)
Explore Q9UJY5 
Go to UniProtKB:  Q9UJY5
GTEx:  ENSG00000100083 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UJY5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.241 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.4α = 90
b = 83.4β = 90
c = 68.95γ = 120
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: 2003-04-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references