4HLQ

Crystal structure of human rab1b bound to GDP and BEF3 in complex with the GAP domain of TBC1D20 from homo sapiens


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Catalytic mechanism of a mammalian Rab-RabGAP complex in atomic detail.

Gavriljuk, K.Gazdag, E.M.Itzen, A.Kotting, C.Goody, R.S.Gerwert, K.

(2012) Proc Natl Acad Sci U S A 109: 21348-21353

  • DOI: https://doi.org/10.1073/pnas.1214431110
  • Primary Citation of Related Structures:  
    4HL4, 4HLQ

  • PubMed Abstract: 

    Rab GTPases, key regulators of vesicular transport, hydrolyze GTP very slowly unless assisted by Rab GTPase-activating proteins (RabGAPs). Dysfunction of RabGAPs is involved in many diseases. By combining X-ray structure analysis and time-resolved FTIR spectroscopy we reveal here the detailed molecular reaction mechanism of a complex between human Rab and RabGAP at the highest possible spatiotemporal resolution and in atomic detail. A glutamine residue of Rab proteins (cis-glutamine) that is essential for intrinsic activity is less important in the GAP-activated reaction. During generation of the RabGAP·Rab:GTP complex, there is a rapid conformational change in which the cis-glutamine is replaced by a glutamine from RabGAP (trans-glutamine); this differs from the RasGAP mechanism, where the cis-glutamine is also important for GAP catalysis. However, as in the case of Ras, a trans-arginine is also recruited to complete the active center during this conformational change. In contrast to the RasGAP mechanism, an accumulation of a state in which phosphate is bound is not observed, and bond breakage is the rate-limiting step. The movement of trans-glutamine and trans-arginine into the catalytic site and bond breakage during hydrolysis are monitored in real time. The combination of X-ray structure analysis and time-resolved FTIR spectroscopy provides detailed insight in the catalysis of human Rab GTPases.


  • Organizational Affiliation

    Department of Biophysics, Ruhr University Bochum, 44801 Bochum, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TBC1 domain family member 20
A, C, E, G, I
305Homo sapiensMutation(s): 0 
Gene Names: TBC1D20C20orf140
UniProt & NIH Common Fund Data Resources
Find proteins for Q96BZ9 (Homo sapiens)
Explore Q96BZ9 
Go to UniProtKB:  Q96BZ9
PHAROS:  Q96BZ9
GTEx:  ENSG00000125875 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96BZ9
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ras-related protein Rab-1B
B, D, F, H, J
175Homo sapiensMutation(s): 0 
Gene Names: RAB1B
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H0U4 (Homo sapiens)
Explore Q9H0U4 
Go to UniProtKB:  Q9H0U4
PHAROS:  Q9H0U4
GTEx:  ENSG00000174903 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H0U4
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download Ideal Coordinates CCD File 
CA [auth J],
M [auth B],
Q [auth D],
V [auth F],
Y [auth H]
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
AA [auth I],
K [auth A],
O [auth C],
S [auth E],
T [auth E]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
BEF
Query on BEF

Download Ideal Coordinates CCD File 
DA [auth J],
N [auth B],
R [auth D],
W [auth F],
Z [auth H]
BERYLLIUM TRIFLUORIDE ION
Be F3
OGIAHMCCNXDTIE-UHFFFAOYSA-K
MG
Query on MG

Download Ideal Coordinates CCD File 
BA [auth J],
L [auth B],
P [auth D],
U [auth F],
X [auth H]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.17α = 90
b = 118.64β = 90
c = 290.11γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
PHASERphasing
REFMACrefinement
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-01-16
    Type: Initial release
  • Version 1.1: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description