The Ras-RasGAP complex: structural basis for GTPase activation and its loss in oncogenic Ras mutants.Scheffzek, K., Ahmadian, M.R., Kabsch, W., Wiesmuller, L., Lautwein, A., Schmitz, F., Wittinghofer, A.
(1997) Science 277: 333-338
- PubMed: 9219684
- DOI: 10.1126/science.277.5324.333
- Primary Citation of Related Structures:
- PubMed Abstract:
- The Interaction of Ras with Gtpase-Activating Proteins
Wittinghofer, A., Scheffzek, K., Ahmadian, M.R.
(1997) FEBS Lett 410: 63
- Formation of a Transition-State Analog of the Ras Gtpase Reaction by Ras-Gdp, Tetrafluoroaluminate, and Gtpase-Activating Proteins
Mittal, R., Ahmadian, M.R., Goody, R.S., Wittinghofer, A.
(1996) Science 273: 115
- Crystal Structure of the Gtpase-Activating Domain of Human P120Gap and Implications for the Interaction with Ras
Scheffzek, K., Lautwein, A., Kabsch, W., Ahmadian, M.R., Wittinghofer, A.
(1996) Nature 384: 591
- Refined Crystal Structure of the Triphosphate Conformation of H-Ras P21 at 1.35 A 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
- A Cytoplasmic Protein Stimulates Normal N-Ras P21 Gtpase, But Does not Affect Oncogenic Mutants
Trahey, M., Mccormick, F.
(1987) Science 238: 542
- Biological and Biochemical Properties of Human Rash Genes Mutated at Codon 61
Der, C.J., Finkel, T., Cooper, G.M.
(1986) Cell 44: 167
- Biological Properties of Human C-Ha-Ras1 Genes Mutated at Codon 12
Seeburg, P.H., Colby, W.W., Capon, D.J., Goeddel, D.V., Levinson, A.D.
(1984) Nature 312: 71
The three-dimensional structure of the complex between human H-Ras bound to guanosine diphosphate and the guanosine triphosphatase (GTPase)-activating domain of the human GTPase-activating protein p120GAP (GAP-334) in the presence of aluminum fluorid ...
The three-dimensional structure of the complex between human H-Ras bound to guanosine diphosphate and the guanosine triphosphatase (GTPase)-activating domain of the human GTPase-activating protein p120GAP (GAP-334) in the presence of aluminum fluoride was solved at a resolution of 2.5 angstroms. The structure shows the partly hydrophilic and partly hydrophobic nature of the communication between the two molecules, which explains the sensitivity of the interaction toward both salts and lipids. An arginine side chain (arginine-789) of GAP-334 is supplied into the active site of Ras to neutralize developing charges in the transition state. The switch II region of Ras is stabilized by GAP-334, thus allowing glutamine-61 of Ras, mutation of which activates the oncogenic potential, to participate in catalysis. The structural arrangement in the active site is consistent with a mostly associative mechanism of phosphoryl transfer and provides an explanation for the activation of Ras by glycine-12 and glutamine-61 mutations. Glycine-12 in the transition state mimic is within van der Waals distance of both arginine-789 of GAP-334 and glutamine-61 of Ras, and even its mutation to alanine would disturb the arrangements of residues in the transition state.
Max-Planck-Institut für molekulare Physiologie, Abteilung Strukturelle Biologie, Rheinlanddamm 201, 44139 Dortmund, Germany.