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- PDB-8g4h: KRAS G13C complex with GDP imaged on a cryo-EM imaging scaffold -

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Basic information

Entry
Database: PDB / ID: 8g4h
TitleKRAS G13C complex with GDP imaged on a cryo-EM imaging scaffold
Components
  • GTPase KRas
  • RCG-33 - Cryo-EM imaging scaffold subunit B fused to DARPin
KeywordsSIGNALING PROTEIN / CryoEM imaging scaffold / Cancer / GTPase
Function / homology
Function and homology information


forebrain astrocyte development / regulation of synaptic transmission, GABAergic / negative regulation of epithelial cell differentiation / epithelial tube branching involved in lung morphogenesis / type I pneumocyte differentiation / Rac protein signal transduction / skeletal muscle cell differentiation / positive regulation of Rac protein signal transduction / Signaling by RAS GAP mutants / Signaling by RAS GTPase mutants ...forebrain astrocyte development / regulation of synaptic transmission, GABAergic / negative regulation of epithelial cell differentiation / epithelial tube branching involved in lung morphogenesis / type I pneumocyte differentiation / Rac protein signal transduction / skeletal muscle cell differentiation / positive regulation of Rac protein signal transduction / Signaling by RAS GAP mutants / Signaling by RAS GTPase mutants / Activation of RAS in B cells / RAS signaling downstream of NF1 loss-of-function variants / RUNX3 regulates p14-ARF / SOS-mediated signalling / Activated NTRK3 signals through RAS / Activated NTRK2 signals through RAS / SHC1 events in ERBB4 signaling / Signalling to RAS / glial cell proliferation / SHC-related events triggered by IGF1R / Activated NTRK2 signals through FRS2 and FRS3 / Estrogen-stimulated signaling through PRKCZ / SHC-mediated cascade:FGFR3 / MET activates RAS signaling / PTK6 Regulates RHO GTPases, RAS GTPase and MAP kinases / Signaling by PDGFRA transmembrane, juxtamembrane and kinase domain mutants / Signaling by PDGFRA extracellular domain mutants / SHC-mediated cascade:FGFR2 / SHC-mediated cascade:FGFR4 / protein-membrane adaptor activity / Signaling by FGFR4 in disease / SHC-mediated cascade:FGFR1 / Erythropoietin activates RAS / homeostasis of number of cells within a tissue / positive regulation of glial cell proliferation / FRS-mediated FGFR3 signaling / Signaling by CSF3 (G-CSF) / Signaling by FLT3 ITD and TKD mutants / FRS-mediated FGFR2 signaling / FRS-mediated FGFR4 signaling / Signaling by FGFR3 in disease / p38MAPK events / FRS-mediated FGFR1 signaling / Tie2 Signaling / Signaling by FGFR2 in disease / GRB2 events in EGFR signaling / striated muscle cell differentiation / SHC1 events in EGFR signaling / EGFR Transactivation by Gastrin / Signaling by FLT3 fusion proteins / Ras activation upon Ca2+ influx through NMDA receptor / FLT3 Signaling / Signaling by FGFR1 in disease / GRB2 events in ERBB2 signaling / NCAM signaling for neurite out-growth / CD209 (DC-SIGN) signaling / SHC1 events in ERBB2 signaling / Downstream signal transduction / Insulin receptor signalling cascade / Constitutive Signaling by Overexpressed ERBB2 / small monomeric GTPase / G protein activity / Signaling by phosphorylated juxtamembrane, extracellular and kinase domain KIT mutants / VEGFR2 mediated cell proliferation / FCERI mediated MAPK activation / regulation of long-term neuronal synaptic plasticity / Signaling by ERBB2 TMD/JMD mutants / RAF activation / Signaling by high-kinase activity BRAF mutants / Constitutive Signaling by EGFRvIII / visual learning / MAP2K and MAPK activation / Signaling by ERBB2 ECD mutants / Signaling by ERBB2 KD Mutants / Signaling by SCF-KIT / cytoplasmic side of plasma membrane / Regulation of RAS by GAPs / Negative regulation of MAPK pathway / RAS processing / GDP binding / Signaling by RAF1 mutants / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants / Signaling by CSF1 (M-CSF) in myeloid cells / MAPK cascade / Signaling by BRAF and RAF1 fusions / Constitutive Signaling by Ligand-Responsive EGFR Cancer Variants / DAP12 signaling / Ca2+ pathway / gene expression / actin cytoskeleton organization / RAF/MAP kinase cascade / neuron apoptotic process / Ras protein signal transduction / negative regulation of neuron apoptotic process / mitochondrial outer membrane / positive regulation of protein phosphorylation / Golgi membrane / focal adhesion
Similarity search - Function
Small GTPase, Ras-type / small GTPase Ras family profile. / Ran (Ras-related nuclear proteins) /TC4 subfamily of small GTPases / Rho (Ras homology) subfamily of Ras-like small GTPases / Ras subfamily of RAS small GTPases / Small GTPase / Ras family / Rab subfamily of small GTPases / Small GTP-binding protein domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
GUANOSINE-5'-DIPHOSPHATE / GTPase KRas
Similarity search - Component
Biological speciessynthetic construct (others)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.87 Å
AuthorsCastells-Graells, R. / Sawaya, M.R. / Yeates, T.O.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM129854 United States
Department of Energy (DOE, United States)DE-FC02-02ER63421 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Cryo-EM structure determination of small therapeutic protein targets at 3 Å-resolution using a rigid imaging scaffold.
Authors: Roger Castells-Graells / Kyle Meador / Mark A Arbing / Michael R Sawaya / Morgan Gee / Duilio Cascio / Emma Gleave / Judit É Debreczeni / Jason Breed / Karoline Leopold / Ankoor Patel / ...Authors: Roger Castells-Graells / Kyle Meador / Mark A Arbing / Michael R Sawaya / Morgan Gee / Duilio Cascio / Emma Gleave / Judit É Debreczeni / Jason Breed / Karoline Leopold / Ankoor Patel / Dushyant Jahagirdar / Bronwyn Lyons / Sriram Subramaniam / Chris Phillips / Todd O Yeates /
Abstract: Cryoelectron microscopy (Cryo-EM) has enabled structural determination of proteins larger than about 50 kDa, including many intractable by any other method, but it has largely failed for smaller ...Cryoelectron microscopy (Cryo-EM) has enabled structural determination of proteins larger than about 50 kDa, including many intractable by any other method, but it has largely failed for smaller proteins. Here, we obtain structures of small proteins by binding them to a rigid molecular scaffold based on a designed protein cage, revealing atomic details at resolutions reaching 2.9 Å. We apply this system to the key cancer signaling protein KRAS (19 kDa in size), obtaining four structures of oncogenic mutational variants by cryo-EM. Importantly, a structure for the key G12C mutant bound to an inhibitor drug (AMG510) reveals significant conformational differences compared to prior data in the crystalline state. The findings highlight the promise of cryo-EM scaffolds for advancing the design of drug molecules against small therapeutic protein targets in cancer and other human diseases.
History
DepositionFeb 9, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 9, 2023Provider: repository / Type: Initial release
Revision 1.1Sep 27, 2023Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: RCG-33 - Cryo-EM imaging scaffold subunit B fused to DARPin
B: GTPase KRas
hetero molecules


Theoretical massNumber of molelcules
Total (without water)55,3604
Polymers54,8922
Non-polymers4682
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein RCG-33 - Cryo-EM imaging scaffold subunit B fused to DARPin


Mass: 35452.441 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli BL21 (bacteria)
#2: Protein GTPase KRas / K-Ras 2 / Ki-Ras / c-K-ras / c-Ki-ras


Mass: 19439.863 Da / Num. of mol.: 1 / Mutation: G13C
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KRAS, KRAS2, RASK2 / Production host: Escherichia coli (E. coli) / References: UniProt: P01116, small monomeric GTPase
#3: Chemical ChemComp-GDP / GUANOSINE-5'-DIPHOSPHATE / Guanosine diphosphate


Type: RNA linking / Mass: 443.201 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H15N5O11P2 / Comment: GDP, energy-carrying molecule*YM
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: KRAS G13C complex with GDP displayed on a Cryo-EM imaging scaffold
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: synthetic construct (others)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/2
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2200 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

Software
NameVersionClassification
phenix.real_space_refine1.20_4459refinement
PHENIX1.20_4459refinement
EM softwareName: PHENIX / Version: 1.20_4459 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.87 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1653856 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 44.76 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00222572
ELECTRON MICROSCOPYf_angle_d0.44463481
ELECTRON MICROSCOPYf_chiral_restr0.0374395
ELECTRON MICROSCOPYf_plane_restr0.0041452
ELECTRON MICROSCOPYf_dihedral_angle_d11.4518955

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