2ZET

Crystal structure of the small GTPase Rab27B complexed with the Slp homology domain of Slac2-a/melanophilin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.247 

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Literature

Structural basis for the exclusive specificity of Slac2-a/melanophilin for the Rab27 GTPases.

Kukimoto-Niino, M., Sakamoto, A., Kanno, E., Hanawa-Suetsugu, K., Terada, T., Shirouzu, M., Fukuda, M., Yokoyama, S.

(2008) Structure 16: 1478-1490

  • DOI: 10.1016/j.str.2008.07.014
  • Primary Citation of Related Structures:  
    2ZET

  • PubMed Abstract: 

    • Rab27A is required for actin-based melanosome transport in mammalian skin melanocytes through its interaction with a specific effector, Slac2-a/melanophilin. Mutations that disrupt the Rab27A/Slac2-a interaction cause human Griscelli syndrome. The other Rab27 isoform, Rab27B, also binds all of the known effectors of Rab27A ...

    Rab27A is required for actin-based melanosome transport in mammalian skin melanocytes through its interaction with a specific effector, Slac2-a/melanophilin. Mutations that disrupt the Rab27A/Slac2-a interaction cause human Griscelli syndrome. The other Rab27 isoform, Rab27B, also binds all of the known effectors of Rab27A. In this study, we determined the crystal structure of the constitutively active form of Rab27B complexed with GTP and the effector domain of Slac2-a. The Rab27B/Slac2-a complex exhibits several intermolecular hydrogen bonds that were not observed in the previously reported Rab3A/rabphilin complex. A Rab27A mutation that disrupts one of the specific hydrogen bonds with Slac2-a resulted in the dramatic reduction of Slac2-a binding activity. Furthermore, we generated a Rab3A mutant that acquires Slac2-a binding ability by transplanting four Rab27-specific residues into Rab3A. These findings provide the structural basis for the exclusive association of Slac2-a with the Rab27 subfamily, whereas rabphilin binds several subfamilies, including Rab3 and Rab27.

    Organizational Affiliation: 

    Systems and Structural Biology Center, Yokohama Institute, RIKEN, 1-7-22 Suehiro-cho, Tsurumi, Yokohama 230-0045, Japan.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ras-related protein Rab-27BA, C [auth B]203Mus musculusMutation(s): 1 
Gene Names: Rab27b
EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for Q99P58 (Mus musculus)
Explore Q99P58 
Go to UniProtKB:  Q99P58
IMPC:  MGI:1931295
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MelanophilinB [auth C], D153Mus musculusMutation(s): 0 
Gene Names: Slac2a, Mlph, Ln
UniProt
Find proteins for Q91V27 (Mus musculus)
Explore Q91V27 
Go to UniProtKB:  Q91V27
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A, C [auth B]L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.247 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.208α = 90
b = 82.208β = 90
c = 325.484γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance