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 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

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

  • 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 ot ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ras-related protein Rab-27B
A, B
203Mus musculusMutation(s): 1 
Gene Names: Rab27b
EC: 3.6.5.2
Find proteins for Q99P58 (Mus musculus)
Go to UniProtKB:  Q99P58
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Melanophilin
C, D
153Mus musculusMutation(s): 0 
Gene Names: Mlph (Ln, Slac2a)
Find proteins for Q91V27 (Mus musculus)
Go to UniProtKB:  Q91V27
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
C, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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Download CCD File 
C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GTP
Query on GTP

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Download CCD File 
A, B
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.247 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 82.208α = 90.00
b = 82.208β = 90.00
c = 325.484γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
CNSrefinement
HKL-2000data reduction
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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