4GZM

Crystal structure of RAC1 F28L mutant

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.255 

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Literature

RAC1P29S is a spontaneously activating cancer-associated GTPase.

Davis, M.J., Ha, B.H., Holman, E.C., Halaban, R., Schlessinger, J., Boggon, T.J.

(2013) Proc Natl Acad Sci U S A 110: 912-917

  • DOI: 10.1073/pnas.1220895110
  • Primary Citation of Related Structures:  
    4GZL, 4GZM

  • PubMed Abstract: 

    • RAC1 is a small, Ras-related GTPase that was recently reported to harbor a recurrent UV-induced signature mutation in melanoma, resulting in substitution of P29 to serine (RAC1(P29S)), ranking this the third most frequently occurring gain-of-function mutation in melanoma ...

    RAC1 is a small, Ras-related GTPase that was recently reported to harbor a recurrent UV-induced signature mutation in melanoma, resulting in substitution of P29 to serine (RAC1(P29S)), ranking this the third most frequently occurring gain-of-function mutation in melanoma. Although the Ras family GTPases are mutated in about 30% of all cancers, mutations in the Rho family GTPases have rarely been observed. In this study, we demonstrate that unlike oncogenic Ras proteins, which are primarily activated by mutations that eliminate GTPase activity, the activated melanoma RAC1(P29S) protein maintains intrinsic GTP hydrolysis and is spontaneously activated by substantially increased inherent GDP/GTP nucleotide exchange. Determination and comparison of crystal structures for activated RAC1 GTPases suggest that RAC1(F28L)--a known spontaneously activated RAC1 mutant--and RAC1(P29S) are self-activated in distinct fashions. Moreover, the mechanism of RAC1(P29S) and RAC1(F28L) activation differs from the common oncogenic mutations found in Ras-like GTPases that abrogate GTP hydrolysis. The melanoma RAC1(P29S) gain-of-function point mutation therefore represents a previously undescribed class of cancer-related GTPase activity.

    Organizational Affiliation: 

    Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ras-related C3 botulinum toxin substrate 1A, B204Homo sapiensMutation(s): 1 
Gene Names: RAC1, TC25, MIG5
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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63000
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GSP
Query on GSP
Download Ideal Coordinates CCD File 
C [auth A],
E [auth B]		5'-GUANOSINE-DIPHOSPHATE-MONOTHIOPHOSPHATE
C10 H16 N5 O13 P3 S
XOFLBQFBSOEHOG-UUOKFMHZSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
D [auth A],
F [auth B]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.255 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.094α = 90
b = 98.807β = 90.21
c = 51.994γ = 90
Software Package:
Software NamePurpose
Executordata collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2012-09-06 
  • Released Date: 2012-12-12 
    • Deposition Author(s): Ha, B.H., Boggon, T.J.

Revision History  (Full details and data files)

  • Version 1.0: 2012-12-12
    Type: Initial release
  • Version 1.1: 2013-01-16
    Changes: Database references
  • Version 1.2: 2013-01-30
    Changes: Database references