3E5H

Crystal Structure of Rab28 GTPase in the Active (GppNHp-bound) Form

• PDB DOI: https://doi.org/10.2210/pdb3E5H/pdb
• Entry: 3E5H supersedes: 2HY4

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-08-13 Released: 2008-08-26 
• Deposition Author(s): Lee, S.H., Baek, K., Li, Y., Dominguez, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.181 
• R-Value Work: 0.151 
• R-Value Observed: 0.153 

Starting Model: experimental

Literature

Large nucleotide-dependent conformational change in Rab28.

Lee, S.H., Baek, K., Dominguez, R.

(2008) FEBS Lett 582: 4107-4111

• PubMed: 19026641 
• DOI: https://doi.org/10.1016/j.febslet.2008.11.008
• Primary Citation of Related Structures:  
  3E5H


• PubMed Abstract: 
  

  Rab GTPases are essential regulators of membrane trafficking. We report crystal structures of Rab28 in the active (GppNHp-bound) and inactive (GDP-3'P-bound) forms at 1.5 and 1.1A resolution. Rab28 is a distant member of the Rab family. While the overall fold of Rab28 resembles that of other Rab GTPases, it undergoes a larger nucleotide-dependent conformational change than other members of this family. Added flexibility resulting from a double-glycine motif at the beginning of switch 2 might partially account for this observation. The double-glycine motif, which is conserved in the Arf family, only occurs in Rab28 and Rab7B of the Rab family, and may have a profound effect on their catalytic activities.

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Organizational Affiliation: 

Department of Physiology, University of Pennsylvania School of Medicine, 3700 Hamilton Walk, A507 Richards Building, Philadelphia, PA 19104-6085, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 20.71 kDa 
• Atom Count: 1,771 
• Modelled Residue Count: 177 
• Deposited Residue Count: 178 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ras-related protein Rab-28	A	178	Homo sapiens	Mutation(s): 0  Gene Names: rab28
UniProt & NIH Common Fund Data Resources
Find proteins for P51157 (Homo sapiens) Explore P51157  Go to UniProtKB:  P51157
PHAROS:  P51157 GTEx:  ENSG00000157869

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GNP	C [auth A]	PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER C10 H17 N6 O13 P3 UQABYHGXWYXDTK-UUOKFMHZSA-N
GOL	D [auth A], E [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.181 
• R-Value Work: 0.151 
• R-Value Observed: 0.153 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.747	α = 90
b = 79.747	β = 90
c = 66.977	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHENIX	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection
HKL-2000	data reduction
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-08-26 
Deposition Author(s): Lee, S.H., Baek, K., Li, Y., Dominguez, R.
• This entry supersedes: 2HY4

Revision History  

• Version 1.0: 2008-08-26
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.2: 2017-10-25
  Changes: Refinement description
• Version 1.3: 2023-08-30
  Changes: Data collection, Database references, Derived calculations, Refinement description