1MH1

SMALL G-PROTEIN

• PDB DOI: https://doi.org/10.2210/pdb1MH1/pdb

• Classification: GTP-BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1997-01-21 Released: 1998-01-21 
• Deposition Author(s): Hirshberg, M., Stockley, R.W., Dodson, G., Webb, M.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.38 Å
• R-Value Free: 0.205 
• R-Value Work: 0.175 

Starting Model: experimental

Literature

The crystal structure of human rac1, a member of the rho-family complexed with a GTP analogue.

Hirshberg, M., Stockley, R.W., Dodson, G., Webb, M.R.

(1997) Nat Struct Biol 4: 147-152

• PubMed: 9033596 
• DOI: https://doi.org/10.1038/nsb0297-147
• Primary Citation of Related Structures:  
  1MH1


• PubMed Abstract: 
  

  The crystal structure of human rac1, a member of the rho family of small G-proteins, complexed with the non-hydrolysable GTP analogue, guanosine-5'-(beta gamma-imino)triphosphate (GMPPNP), has been determined by X-ray analysis at a resolution of 1.38 A. Comparison with the structure of H-ras indicates that rac1 has an extra alpha-helical domain that is characteristic of the rho G proteins, and may be involved in the signalling pathway of this family.

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Organizational Affiliation: 

Division of Protein Structure, National Institute for Medical Research, Mill Hill, London, UK.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.06 kDa 
• Atom Count: 1,684 
• Modelled Residue Count: 183 
• Deposited Residue Count: 186 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RAC1	A	186	Homo sapiens	Mutation(s): 1  Gene Names: RHO EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P63000 (Homo sapiens) Explore P63000  Go to UniProtKB:  P63000
PHAROS:  P63000 GTEx:  ENSG00000136238

Small Molecules

Ligands 2 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
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.38 Å
• R-Value Free: 0.205 
• R-Value Work: 0.175 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.44	α = 90
b = 103.05	β = 90
c = 43.673	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-01-21 
Deposition Author(s): Hirshberg, M., Stockley, R.W., Dodson, G., Webb, M.R.

Revision History  

• Version 1.0: 1998-01-21
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-11-03
  Changes: Database references, Derived calculations
• Version 1.4: 2023-08-09
  Changes: Refinement description
• Version 1.5: 2024-05-22
  Changes: Data collection