6Q21

MOLECULAR SWITCH FOR SIGNAL TRANSDUCTION: STRUCTURAL DIFFERENCES BETWEEN ACTIVE AND INACTIVE FORMS OF PROTOONCOGENIC RAS PROTEINS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Molecular switch for signal transduction: structural differences between active and inactive forms of protooncogenic ras proteins.

Milburn, M.V.Tong, L.deVos, A.M.Brunger, A.Yamaizumi, Z.Nishimura, S.Kim, S.H.

(1990) Science 247: 939-945

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Ras proteins participate as a molecular switch in the early steps of the signal transduction pathway that is associated with cell growth and differentiation. When the protein is in its GTP complexed form it is active in signal transduction, whereas i ...

    Ras proteins participate as a molecular switch in the early steps of the signal transduction pathway that is associated with cell growth and differentiation. When the protein is in its GTP complexed form it is active in signal transduction, whereas it is inactive in its GDP complexed form. A comparison of eight three-dimensional structures of ras proteins in four different crystal lattices, five with a nonhydrolyzable GTP analog and three with GDP, reveals that the "on" and "off" states of the switch are distinguished by conformational differences that span a length of more than 40 A, and are induced by the gamma-phosphate. The most significant differences are localized in two regions: residues 30 to 38 (the switch I region) in the second loop and residues 60 to 76 (the switch II region) consisting of the fourth loop and the short alpha-helix that follows the loop. Both regions are highly exposed and form a continuous strip on the molecular surface most likely to be the recognition sites for the effector and receptor molecule(or molecules). The conformational differences also provide a structural basis for understanding the biological and biochemical changes of the proteins due to oncogenic mutations, autophosphorylation, and GTP hydrolysis, and for understanding the interactions with other proteins.


    Related Citations: 
    • Crystal Structure of an Active Form of Ras Protein, a Complex of a GTP Analog and the Hras P21 Catalytic Domain
      Brunger, A.T.,Milburn, M.V.,Tong, L.,Devos, A.M.,Jancarik, J.,Yamaizumi, Z.,Nishimura, S.,Ohtsuka, E.,Kim, S.-H.
      (1990) Proc.Natl.Acad.Sci.USA 87: 4849
    • X-Ray Crystal Structures of Transforming P21 Ras Mutants Suggest a Transition-State Stabilization Mechanism for GTP Hydrolysis
      Prive, G.G.,Milburn, M.V.,Tong, L.,Devos, A.M.,Yamaizumi, Z.,Nishimura, S.,Kim, S.-H.
      (1992) Proc.Natl.Acad.Sci.USA 89: 3649
    • Three-Dimensional Structure of an Oncogene Protein. Catalytic Domain of Human C-H-Ras P21
      Devos, A.M.,Tong, L.,Milburn, M.V.,Matias, P.M.,Jancarik, J.,Noguchi, S.,Nishimura, S.,Miura, K.,Ohtsuka, E.,Kim, S.-H.
      (1988) Science 239: 888
    • Structure of Ras Protein
      Tong, L.,Milburn, M.V.,Devos, A.M.,Kim, S.-H.
      (1989) Science 245: 244


    Organizational Affiliation

    Department of Chemistry, University of California, Berkeley.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
C-H-RAS P21 PROTEIN CATALYTIC DOMAIN
A, B, C, D
171Homo sapiensMutation(s): 0 
Gene Names: HRAS (HRAS1)
Find proteins for P01112 (Homo sapiens)
Go to Gene View: HRAS
Go to UniProtKB:  P01112
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
GCP
Query on GCP

Download SDF File 
Download CCD File 
A, B, C, D
PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
C11 H18 N5 O13 P3
PHBDHXOBFUBCJD-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Work: 0.190 
  • Space Group: P 1 1 21
Unit Cell:
Length (Å)Angle (°)
a = 41.980α = 90.00
b = 79.120β = 90.00
c = 128.500γ = 117.48
Software Package:
Software NamePurpose
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1992-07-27 
  • Released Date: 1992-07-28 
  • Deposition Author(s): Kim, S.-H.

Revision History 

  • Version 1.0: 1992-07-28
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other