4DKX

Crystal Structure of the Rab 6A'(Q72L)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crystal structure of Rab6A'(Q72L) mutant reveals unexpected GDP/Mg2+ binding with opened GTP-binding domain

Shin, Y.-C.Yoon, J.H.Jang, T.-H.Kim, S.Y.Heo, W.D.So, I.Jeon, J.-H.Park, H.H.

(2012) Biochem.Biophys.Res.Commun. 424: 269-273

  • DOI: 10.1016/j.bbrc.2012.06.102

  • PubMed Abstract: 
  • The Ras small G protein-superfamily is a family of GTP hydrolases whose activity is regulated by GTP/GDP binding states. Rab6A, a member of the Ras superfamily, is involved in the regulation of vesicle trafficking, which is critical for endocytosis, ...

    The Ras small G protein-superfamily is a family of GTP hydrolases whose activity is regulated by GTP/GDP binding states. Rab6A, a member of the Ras superfamily, is involved in the regulation of vesicle trafficking, which is critical for endocytosis, biosynthesis, secretion, cell differentiation and cell growth. Rab6A exists in two isoforms, termed RabA and Rab6A'. Substitution of Gln72 to Leu72 (Q72L) at Rab6 family blocks GTP hydrolysis activity and this mutation usually causes the Rab6 protein to be constitutively in an active form. Here, we report the crystal structure of the human Rab6A'(Q72L) mutant form at 1.9Å resolution. Unexpectedly, we found that Rab6A'(Q72L) possesses GDP/Mg(2+) in the GTP binding pockets, which is formed by a flexible switch I and switch II. Large conformational changes were also detected in the switch I and switch II regions. Our structure revealed that the non-hydrolysable, constitutively active form of Rab6A' can accommodate GDP/Mg(2+) in the open conformation.


    Organizational Affiliation

    Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul 110-799, South Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ras-related protein Rab-6A
A, B
216Homo sapiensMutation(s): 1 
Gene Names: RAB6A (RAB6)
Find proteins for P20340 (Homo sapiens)
Go to Gene View: RAB6A
Go to UniProtKB:  P20340
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download SDF File 
Download CCD File 
A, B
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.196 
  • Space Group: P 2 21 21
Unit Cell:
Length (Å)Angle (°)
a = 36.838α = 90.00
b = 96.780β = 90.00
c = 109.997γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
HKL-2000data collection
AMoREphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-10-17
    Type: Initial release