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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This is version 1.2 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: https://doi.org/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. 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ras-related protein Rab-27BA,
C [auth B]
203Mus musculusMutation(s): 1 
Gene Names: Rab27b
UniProt & NIH Common Fund Data Resources
Find proteins for Q99P58 (Mus musculus)
Explore Q99P58 
Go to UniProtKB:  Q99P58
IMPC:  MGI:1931295
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99P58
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
MelanophilinB [auth C],
D
153Mus musculusMutation(s): 0 
Gene Names: Slac2a
UniProt
Find proteins for Q91V27 (Mus musculus)
Explore Q91V27 
Go to UniProtKB:  Q91V27
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ91V27
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download Ideal Coordinates CCD File 
F [auth A],
K [auth B]
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
I [auth C],
N [auth D]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
ZN
Query on ZN

Download Ideal Coordinates CCD File 
G [auth C],
H [auth C],
L [auth D],
M [auth D]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
E [auth A],
J [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D 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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Ligand Structure Quality Assessment 


Entry History 

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
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations