1TU3

Crystal Structure of Rab5 complex with Rabaptin5 C-terminal Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 

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This is version 1.2 of the entry. See complete history


Literature

Structural basis of Rab5-Rabaptin5 interaction in endocytosis

Zhu, G.Zhai, P.Liu, J.Terzyan, S.Li, G.Zhang, X.C.

(2004) Nat Struct Mol Biol 11: 975-983

  • DOI: https://doi.org/10.1038/nsmb832
  • Primary Citation of Related Structures:  
    1TU3, 1TU4

  • PubMed Abstract: 
  • Rab5 is a small GTPase that regulates early endosome fusion. We present here the crystal structure of the Rab5 GTPase domain in complex with a GTP analog and the C-terminal domain of effector Rabaptin5. The proteins form a dyad-symmetric Rab5-Rabaptin5(2)-Rab5 ternary complex with a parallel coiled-coil Rabaptin5 homodimer in the middle ...

    Rab5 is a small GTPase that regulates early endosome fusion. We present here the crystal structure of the Rab5 GTPase domain in complex with a GTP analog and the C-terminal domain of effector Rabaptin5. The proteins form a dyad-symmetric Rab5-Rabaptin5(2)-Rab5 ternary complex with a parallel coiled-coil Rabaptin5 homodimer in the middle. Two Rab5 molecules bind independently to the Rabaptin5 dimer using their switch and interswitch regions. The binding does not involve the Rab complementarity-determining regions. We also present the crystal structures of two distinct forms of GDP-Rab5 complexes, both of which are incompatible with Rabaptin5 binding. One has a dislocated and disordered switch I but a virtually intact switch II, whereas the other has its beta-sheet and both switch regions reorganized. Biochemical and functional analyses show that the crystallographically observed Rab5-Rabaptin5 complex also exists in solution, and disruption of this complex by mutation abrogates endosome fusion.


    Organizational Affiliation

    Crystallography Research Program, Oklahoma Medical Research Foundation, 825 N.E. 13th Street, Oklahoma City, Oklahoma 73104, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ras-related protein Rab-5AA, B, C, D, E171Homo sapiensMutation(s): 0 
Gene Names: RAB5ARAB5
EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P20339 (Homo sapiens)
Explore P20339 
Go to UniProtKB:  P20339
PHAROS:  P20339
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UniProt GroupP20339
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Rab GTPase binding effector protein 1F, G, H, I, J79Homo sapiensMutation(s): 0 
Gene Names: RABEP1RABPT5RABPT5ARAB5EP
UniProt & NIH Common Fund Data Resources
Find proteins for Q15276 (Homo sapiens)
Explore Q15276 
Go to UniProtKB:  Q15276
PHAROS:  Q15276
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15276
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.4α = 90
b = 83.5β = 102.2
c = 144.9γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance