ras Guanine Nucleotide Exchange FactorsSon of Sevenless Proteinsras-GRF1Protein ConformationGuanine Nucleotide Exchange Factorsras ProteinsGRB2 Adaptor ProteinModels, MolecularGenes, rasProtein BindingBinding SitesProtein Structure, TertiaryKineticsMolecular Sequence DataProtein Structure, SecondaryCrystallography, X-RayAmino Acid SequenceSpectrometry, FluorescenceCircular DichroismProto-Oncogene Proteins p21(ras)Molecular ConformationThermodynamicsHydrogen-Ion ConcentrationLigandsMutationMagnetic Resonance SpectroscopyDeuterium Exchange MeasurementOncogene Protein p21(ras)Protein FoldingStructure-Activity RelationshipEscherichia coliNucleic Acid ConformationMutagenesis, Site-DirectedModels, ChemicalTemperatureProtein Structure, QuaternaryMolecular Dynamics SimulationRecombinant ProteinsAdenosine TriphosphateNuclear Magnetic Resonance, BiomolecularProtein DenaturationDimerizationTryptophanAllosteric RegulationHydrogen BondingCatalysisCatalytic DomainHydrolysisFluorescence Resonance Energy TransferAmino Acid SubstitutionCysteineBacterial ProteinsSpectrophotometry, UltravioletMagnesiumBase SequenceSubstrate SpecificityFluorescenceComputer SimulationModels, BiologicalProtein MultimerizationAllosteric SiteEscherichia coli ProteinsPeptide FragmentsSolutionsProteinsCalciumPeptidesTrypsinras GTPase-Activating ProteinsSequence Homology, Amino AcidGuanosine TriphosphateMacromolecular SubstancesCattleAnilino NaphthalenesulfonatesSpectroscopy, Fourier Transform InfraredProtonsDNAHydrogenCell LineNaphthalenesulfonatesStatic ElectricityAdenosine DiphosphateCryoelectron MicroscopyAdenosine TriphosphatasesFluorescent DyesCell MembraneDisulfidesGuanosine DiphosphateEnzyme ActivationPulmonary Gas ExchangeMolecular StructureWaterApoproteinsCalorimetrySolventsNucleotidesCrystallographySignal TransductionDeuteriumElectrophoresis, Polyacrylamide Gel