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- PDB-8vgq: CryoEM structure of GNE-1952-alkylated KRAS G12C in complex with ... -

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Basic information

Entry
Database: PDB / ID: 8vgq
TitleCryoEM structure of GNE-1952-alkylated KRAS G12C in complex with engineered conformationally rigid Fab 2H11.4DS
Components
  • (Fab 2H11.4DS ...) x 2
  • GTPase KRas
KeywordsONCOPROTEIN/IMMUNE SYSTEM / fab / antigen binding fragment / protein engineering / gtpase / ONCOPROTEIN-MMUNE SYSTEM complex / ONCOPROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


response to mineralocorticoid / GMP binding / forebrain astrocyte development / LRR domain binding / regulation of synaptic transmission, GABAergic / negative regulation of epithelial cell differentiation / response to isolation stress / response to gravity / epithelial tube branching involved in lung morphogenesis / type I pneumocyte differentiation ...response to mineralocorticoid / GMP binding / forebrain astrocyte development / LRR domain binding / regulation of synaptic transmission, GABAergic / negative regulation of epithelial cell differentiation / response to isolation stress / response to gravity / epithelial tube branching involved in lung morphogenesis / type I pneumocyte differentiation / Rac protein signal transduction / positive regulation of Rac protein signal transduction / Signaling by RAS GAP mutants / Signaling by RAS GTPase mutants / Activation of RAS in B cells / myoblast proliferation / skeletal muscle cell differentiation / RAS signaling downstream of NF1 loss-of-function variants / RUNX3 regulates p14-ARF / positive regulation of glial cell proliferation / SOS-mediated signalling / Activated NTRK3 signals through RAS / Activated NTRK2 signals through RAS / SHC1 events in ERBB4 signaling / cardiac muscle cell proliferation / Signalling to RAS / Activated NTRK2 signals through FRS2 and FRS3 / SHC-related events triggered by IGF1R / Estrogen-stimulated signaling through PRKCZ / glial cell proliferation / SHC-mediated cascade:FGFR3 / MET activates RAS signaling / SHC-mediated cascade:FGFR2 / 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:FGFR4 / Erythropoietin activates RAS / SHC-mediated cascade:FGFR1 / Signaling by FGFR4 in disease / FRS-mediated FGFR3 signaling / Signaling by CSF3 (G-CSF) / Signaling by FLT3 ITD and TKD mutants / FRS-mediated FGFR2 signaling / FRS-mediated FGFR4 signaling / FRS-mediated FGFR1 signaling / p38MAPK events / Signaling by FGFR3 in disease / protein-membrane adaptor activity / Tie2 Signaling / striated muscle cell differentiation / Signaling by FGFR2 in disease / GRB2 events in EGFR signaling / Signaling by FLT3 fusion proteins / SHC1 events in EGFR signaling / FLT3 Signaling / Signaling by FGFR1 in disease / EGFR Transactivation by Gastrin / NCAM signaling for neurite out-growth / CD209 (DC-SIGN) signaling / homeostasis of number of cells within a tissue / Downstream signal transduction / GRB2 events in ERBB2 signaling / Insulin receptor signalling cascade / Ras activation upon Ca2+ influx through NMDA receptor / SHC1 events in ERBB2 signaling / response to glucocorticoid / Constitutive Signaling by Overexpressed ERBB2 / Signaling by phosphorylated juxtamembrane, extracellular and kinase domain KIT mutants / VEGFR2 mediated cell proliferation / small monomeric GTPase / FCERI mediated MAPK activation / liver development / female pregnancy / RAF activation / Signaling by ERBB2 TMD/JMD mutants / Signaling by SCF-KIT / Constitutive Signaling by EGFRvIII / Signaling by high-kinase activity BRAF mutants / regulation of long-term neuronal synaptic plasticity / MAP2K and MAPK activation / Signaling by ERBB2 ECD mutants / visual learning / Signaling by ERBB2 KD Mutants / cytoplasmic side of plasma membrane / cytokine-mediated signaling pathway / Regulation of RAS by GAPs / Signaling by CSF1 (M-CSF) in myeloid cells / RAS processing / Negative regulation of MAPK pathway / 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 / GDP binding / Signaling by BRAF and RAF1 fusions / positive regulation of cellular senescence / DAP12 signaling / MAPK cascade / Constitutive Signaling by Ligand-Responsive EGFR Cancer Variants
Similarity search - Function
Small GTPase, Ras-type / Small GTPase Ras domain 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 speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsKung, J.E. / Sudhamsu, J.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: bioRxiv / Year: 2024
Title: Disulfi de constrained Fabs overcome target size limitation for high-resolution single-particle cryo-EM.
Authors: Jennifer E Kung / Matthew C Johnson / Christine C Jao / Christopher P Arthur / Dimitry Tegunov / Alexis Rohou / Jawahar Sudhamsu /
Abstract: High-resolution structures of proteins are critical to understanding molecular mechanisms of biological processes and in the discovery of therapeutic molecules. Cryo-EM has revolutionized structure ...High-resolution structures of proteins are critical to understanding molecular mechanisms of biological processes and in the discovery of therapeutic molecules. Cryo-EM has revolutionized structure determination of large proteins and their complexes, but a vast majority of proteins that underlie human diseases are small (< 50 kDa) and usually beyond its reach due to low signal-to-noise images and difficulties in particle alignment. Current strategies to overcome this problem increase the overall size of small protein targets using scaffold proteins that bind to the target, but are limited by inherent flexibility and not being bound to their targets in a rigid manner, resulting in the target being poorly resolved compared to the scaffolds. Here we present an iteratively engineered molecular design for transforming Fabs (antibody fragments), into conformationally rigid scaffolds (Rigid-Fabs) that, when bound to small proteins (~20 kDa), can enable high-resolution structure determination using cryo-EM. This design introduces multiple disulfide bonds at strategic locations, generates a well-folded Fab constrained into a rigid conformation and can be applied to Fabs from various species, isotypes and chimeric Fabs. We present examples of the Rigid Fab design enabling high-resolution (2.3-2.5 Å) structures of small proteins, Ang2 (26 kDa) and KRAS (21 kDa) by cryo-EM. The strategies for designing disulfide constrained Rigid Fabs in our work thus establish a general approach to overcome the target size limitation of single particle cryo-EM.
History
DepositionDec 27, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 30, 2024Provider: repository / Type: Initial release
Revision 1.1Nov 13, 2024Group: Data collection / Category: em_admin / Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: GTPase KRas
H: Fab 2H11.4DS heavy chain
L: Fab 2H11.4DS light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)68,5316
Polymers67,6493
Non-polymers8823
Water72140
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 1 types, 1 molecules A

#1: Protein GTPase KRas / K-Ras 2 / Ki-Ras / c-K-ras / c-Ki-ras


Mass: 19352.785 Da / Num. of mol.: 1 / Mutation: G12C, C51S, C80L, C118S
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

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Antibody , 2 types, 2 molecules HL

#2: Antibody Fab 2H11.4DS heavy chain


Mass: 25318.248 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Cricetulus griseus (Chinese hamster)
#3: Antibody Fab 2H11.4DS light chain


Mass: 22977.490 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Cricetulus griseus (Chinese hamster)

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Non-polymers , 4 types, 43 molecules

#4: Chemical ChemComp-A1AAW / 1-{4-[(7M)-6-methyl-7-(5-methyl-2H-indazol-4-yl)quinazolin-4-yl]piperazin-1-yl}propan-1-one


Mass: 414.503 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C24H26N6O / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-GDP / GUANOSINE-5'-DIPHOSPHATE


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


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#7: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 40 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationY

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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

Component
IDNameTypeEntity IDParent-IDSource
1GNE-1952-alkylated KRAS G12C in complex with Fab 2H11.4DSCOMPLEX#1-#30MULTIPLE SOURCES
2GNE-1952-alkylated KRAS G12CCOMPLEX#11RECOMBINANT
3Fab 2H11.4DSCOMPLEX#2-#31RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
32Homo sapiens (human)9606
43Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
32Escherichia coli (E. coli)562
43Cricetulus griseus (Chinese hamster)10029
Buffer solutionpH: 7
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPES1
2100 mMsodium chlorideNaCl1
35 mMmagnesium chlorideMgCl21
45 uMGDP1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: The peak fraction was subjected to mild crosslinking with 0.5 mM BS3 at room temperature for 10 min. The crosslinking reaction was quenched by addition of 100mM Tris pH 7.5.
Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R0.6/1
VitrificationCryogen 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 FIELD / Nominal magnification: 105000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm
Image recordingElectron dose: 40.3 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2EPUimage acquisition
4cryoSPARCCTF correction
7ISOLDEmodel fitting
8UCSF ChimeraXmodel fitting
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
14PHENIX1.21rc1_5049model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 926738 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT
Atomic model buildingPDB-ID: 7RP3

7rp3


Accession code: 7RP3 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0134746
ELECTRON MICROSCOPYf_angle_d1.0416471
ELECTRON MICROSCOPYf_dihedral_angle_d14.4351719
ELECTRON MICROSCOPYf_chiral_restr0.064721
ELECTRON MICROSCOPYf_plane_restr0.011821

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