621P

THREE-DIMENSIONAL STRUCTURES OF H-RAS P21 MUTANTS: MOLECULAR BASIS FOR THEIR INABILITY TO FUNCTION AS SIGNAL SWITCH MOLECULES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Three-dimensional structures of H-ras p21 mutants: molecular basis for their inability to function as signal switch molecules.

Krengel, U.Schlichting, I.Scherer, A.Schumann, R.Frech, M.John, J.Kabsch, W.Pai, E.F.Wittinghofer, A.

(1990) Cell 62: 539-548

  • Primary Citation of Related Structures:  221P, 421P, 521P, 721P

  • PubMed Abstract: 
  • The X-ray structures of the guanine nucleotide binding domains (amino acids 1-166) of five mutants of the H-ras oncogene product p21 were determined. The mutations described are Gly-12----Arg, Gly-12----Val, Gln-61----His, Gln-61----Leu, which are al ...

    The X-ray structures of the guanine nucleotide binding domains (amino acids 1-166) of five mutants of the H-ras oncogene product p21 were determined. The mutations described are Gly-12----Arg, Gly-12----Val, Gln-61----His, Gln-61----Leu, which are all oncogenic, and the effector region mutant Asp-38----Glu. The resolutions of the crystal structures range from 2.0 to 2.6 A. Cellular and mutant p21 proteins are almost identical, and the only significant differences are seen in loop L4 and in the vicinity of the gamma-phosphate. For the Gly-12 mutants the larger side chains interfere with GTP binding and/or hydrolysis. Gln-61 in cellular p21 adopts a conformation where it is able to catalyze GTP hydrolysis. This conformation has not been found for the mutants of Gln-61. Furthermore, Leu-61 cannot activate the nucleophilic water because of the chemical nature of its side chain. The D38E mutation preserves its ability to bind GAP.


    Related Citations: 
    • Refined Crystal Structure of the Triphosphate Conformation of H-Ras P21 at 1.35 Angstroms Resolution: Implications for the Mechanism of GTP Hydrolysis
      Pai, E.F.,Krengel, U.,Petsko, G.A.,Goody, R.S.,Kabsch, W.,Wittinghofer, A.
      (1990) Embo J. 9: 2351


    Organizational Affiliation

    Max-Planck-Institut für medizinische Forschung Abteilung Biophysik, Heidelberg, Federal Republic of Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
H-RAS P21 PROTEIN
A
166Homo sapiensGene 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
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
GNP
Query on GNP

Download SDF File 
Download CCD File 
A
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER
C10 H17 N6 O13 P3
UQABYHGXWYXDTK-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.180 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 40.400α = 90.00
b = 40.400β = 90.00
c = 160.700γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2012-03-07
    Type: Database references
  • Version 1.4: 2017-11-29
    Type: Derived calculations, Other