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- PDB-8dfm: Ectodomain of full-length wild-type KIT-SCF dimers -

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Basic information

Entry
Database: PDB / ID: 8dfm
TitleEctodomain of full-length wild-type KIT-SCF dimers
Components
  • Isoform 2 of Mast/stem cell growth factor receptor Kit
  • Soluble KIT ligand
KeywordsTRANSFERASE / receptor tyrosine kinase / cell signaling / cancer / cryo-EM / KIT / stem cell factor / oncogenic mutant / extracellular domain / asymmetric interface / structural plasticity
Function / homology
Function and homology information


positive regulation of melanocyte differentiation / stem cell factor receptor binding / positive regulation of hematopoietic progenitor cell differentiation / Dasatinib-resistant KIT mutants / Imatinib-resistant KIT mutants / KIT mutants bind TKIs / Masitinib-resistant KIT mutants / Nilotinib-resistant KIT mutants / Regorafenib-resistant KIT mutants / Signaling by kinase domain mutants of KIT ...positive regulation of melanocyte differentiation / stem cell factor receptor binding / positive regulation of hematopoietic progenitor cell differentiation / Dasatinib-resistant KIT mutants / Imatinib-resistant KIT mutants / KIT mutants bind TKIs / Masitinib-resistant KIT mutants / Nilotinib-resistant KIT mutants / Regorafenib-resistant KIT mutants / Signaling by kinase domain mutants of KIT / Sunitinib-resistant KIT mutants / Signaling by juxtamembrane domain KIT mutants / Sorafenib-resistant KIT mutants / Signaling by extracellular domain mutants of KIT / melanocyte adhesion / positive regulation of pyloric antrum smooth muscle contraction / positive regulation of colon smooth muscle contraction / melanocyte migration / stem cell factor receptor activity / positive regulation of vascular associated smooth muscle cell differentiation / Kit signaling pathway / positive regulation of dendritic cell cytokine production / tongue development / positive regulation of small intestine smooth muscle contraction / positive regulation of mast cell cytokine production / mast cell differentiation / mast cell chemotaxis / Fc receptor signaling pathway / mast cell proliferation / immature B cell differentiation / melanocyte differentiation / positive regulation of long-term neuronal synaptic plasticity / primordial germ cell migration / positive regulation of pseudopodium assembly / detection of mechanical stimulus involved in sensory perception of sound / erythropoietin-mediated signaling pathway / megakaryocyte development / pigmentation / embryonic hemopoiesis / digestive tract development / lamellipodium assembly / somatic stem cell population maintenance / Regulation of KIT signaling / stem cell population maintenance / positive regulation of Notch signaling pathway / positive regulation of tyrosine phosphorylation of STAT protein / growth factor binding / Developmental Lineage of Mammary Gland Alveolar Cells / hemopoiesis / cytokine binding / hematopoietic progenitor cell differentiation / T cell differentiation / Developmental Lineage of Mammary Gland Luminal Epithelial Cells / epithelial cell proliferation / ovarian follicle development / response to cadmium ion / TFAP2 (AP-2) family regulates transcription of growth factors and their receptors / B cell differentiation / transmembrane receptor protein tyrosine kinase activity / Transcriptional and post-translational regulation of MITF-M expression and activity / male gonad development / acrosomal vesicle / SH2 domain binding / stem cell differentiation / erythrocyte differentiation / Signaling by phosphorylated juxtamembrane, extracellular and kinase domain KIT mutants / cytokine activity / mast cell degranulation / positive regulation of receptor signaling pathway via JAK-STAT / growth factor activity / cell chemotaxis / filopodium / visual learning / Signaling by SCF-KIT / receptor protein-tyrosine kinase / cytokine-mediated signaling pathway / cytoplasmic side of plasma membrane / Constitutive Signaling by Aberrant PI3K in Cancer / regulation of cell shape / cell-cell junction / PIP3 activates AKT signaling / regulation of cell population proliferation / protein autophosphorylation / cell migration / lamellipodium / PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling / RAF/MAP kinase cascade / actin cytoskeleton organization / protease binding / protein tyrosine kinase activity / spermatogenesis / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / cytoskeleton / positive regulation of MAPK cascade / signaling receptor complex / cell adhesion / positive regulation of cell migration / inflammatory response / external side of plasma membrane / positive regulation of cell population proliferation
Similarity search - Function
Stem cell factor / Stem cell factor / Mast/stem cell growth factor receptor / Tyrosine-protein kinase, receptor class III, conserved site / Receptor tyrosine kinase class III signature. / Four-helical cytokine-like, core / Immunoglobulin / Immunoglobulin domain / : / Immunoglobulin subtype 2 ...Stem cell factor / Stem cell factor / Mast/stem cell growth factor receptor / Tyrosine-protein kinase, receptor class III, conserved site / Receptor tyrosine kinase class III signature. / Four-helical cytokine-like, core / Immunoglobulin / Immunoglobulin domain / : / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Tyrosine-protein kinase, catalytic domain / Tyrosine kinase, catalytic domain / Tyrosine protein kinases specific active-site signature. / Immunoglobulin subtype / Immunoglobulin / Tyrosine-protein kinase, active site / Protein tyrosine and serine/threonine kinase / Serine-threonine/tyrosine-protein kinase, catalytic domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Protein kinase, ATP binding site / Protein kinases ATP-binding region signature. / Immunoglobulin-like fold / Protein kinase domain profile. / Protein kinase domain / Protein kinase-like domain superfamily
Similarity search - Domain/homology
Mast/stem cell growth factor receptor Kit / Kit ligand
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.45 Å
AuthorsKrimmer, S.G. / Bertoletti, N. / Mi, W. / Schlessinger, J.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Cryo-EM analyses of KIT and oncogenic mutants reveal structural oncogenic plasticity and a target for therapeutic intervention.
Authors: Stefan G Krimmer / Nicole Bertoletti / Yoshihisa Suzuki / Luka Katic / Jyotidarsini Mohanty / Sheng Shu / Sangwon Lee / Irit Lax / Wei Mi / Joseph Schlessinger /
Abstract: The receptor tyrosine kinase KIT and its ligand stem cell factor (SCF) are required for the development of hematopoietic stem cells, germ cells, and other cells. A variety of human cancers, such as ...The receptor tyrosine kinase KIT and its ligand stem cell factor (SCF) are required for the development of hematopoietic stem cells, germ cells, and other cells. A variety of human cancers, such as acute myeloid leukemia, gastrointestinal stromal tumor, and mast cell leukemia, are driven by somatic gain-of-function KIT mutations. Here, we report cryo electron microscopy (cryo-EM) structural analyses of full-length wild-type and two oncogenic KIT mutants, which show that the overall symmetric arrangement of the extracellular domain of ligand-occupied KIT dimers contains asymmetric D5 homotypic contacts juxtaposing the plasma membrane. Mutational analysis of KIT reveals in D5 region an "Achilles heel" for therapeutic intervention. A ligand-sensitized oncogenic KIT mutant exhibits a more comprehensive and stable D5 asymmetric conformation. A constitutively active ligand-independent oncogenic KIT mutant adopts a V-shaped conformation solely held by D5-mediated contacts. Binding of SCF to this mutant fully restores the conformation of wild-type KIT dimers, including the formation of salt bridges responsible for D4 homotypic contacts and other hallmarks of SCF-induced KIT dimerization. These experiments reveal an unexpected structural plasticity of oncogenic KIT mutants and a therapeutic target in D5.
History
DepositionJun 22, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 29, 2023Provider: repository / Type: Initial release
Revision 1.1Apr 5, 2023Group: Database references / Category: citation / citation_author
Item: _citation.page_first / _citation.page_last ..._citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Nov 6, 2024Group: Data collection / Refinement description / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Isoform 2 of Mast/stem cell growth factor receptor Kit
B: Isoform 2 of Mast/stem cell growth factor receptor Kit
C: Soluble KIT ligand
D: Soluble KIT ligand
hetero molecules


Theoretical massNumber of molelcules
Total (without water)255,46910
Polymers253,3294
Non-polymers2,1406
Water00
1


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

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Components

#1: Protein Isoform 2 of Mast/stem cell growth factor receptor Kit / SCFR / Piebald trait protein / PBT / Proto-oncogene c-Kit / Tyrosine-protein kinase Kit / p145 c- ...SCFR / Piebald trait protein / PBT / Proto-oncogene c-Kit / Tyrosine-protein kinase Kit / p145 c-kit / v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog


Mass: 110657.008 Da / Num. of mol.: 2 / Mutation: K619A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KIT, SCFR / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P10721, receptor protein-tyrosine kinase
#2: Protein Soluble KIT ligand / sKITLG


Mass: 16007.306 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KITLG, MGF, SCF / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): CodonPlus RIPL / References: UniProt: P21583
#3: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
#4: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
Has ligand of interestN
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

ComponentName: Full-length wild-type KIT-SCF dimers reconstituted in amphipol
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.25 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
120 mM(4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid)C8H18N2O4S1
2200 mMSodium chlorideNaCl1
30.1 %(1H, 1H, 2H, 2H-Perfluorooctyl)phosphocholineC13H17F13NO4P1
SpecimenConc.: 5.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was monodisperse.
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: C-flat-1.2/1.3
VitrificationInstrument: GATAN CRYOPLUNGE 3 / Cryogen name: ETHANE / Humidity: 90 % / Chamber temperature: 293 K / Details: Blotting time 3 sec, blotting force 0.

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS / Details: SerialEM COMA-FREE ALIGNMENT
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 64000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 8.9 sec. / Electron dose: 49.23 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5925

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
EM software
IDNameVersionCategory
1cryoSPARC3.1.0particle selection
2SerialEMimage acquisition
4cryoSPARC3.1.0CTF correction
7ISOLDE1.0b3model fitting
9PHENIX1.02.1-4487-000model refinement
10cryoSPARC3.1.0initial Euler assignment
11cryoSPARC3.1.0final Euler assignment
12cryoSPARC3.1.0classification
13cryoSPARC3.1.03D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1096589
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.45 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 500569 / Symmetry type: POINT
Atomic model buildingB value: 117 / Protocol: RIGID BODY FIT / Space: REAL
Atomic model buildingPDB-ID: 2E9W

2e9w


Accession code: 2E9W / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0058591
ELECTRON MICROSCOPYf_angle_d1.11311757
ELECTRON MICROSCOPYf_dihedral_angle_d12.2772807
ELECTRON MICROSCOPYf_chiral_restr0.0681425
ELECTRON MICROSCOPYf_plane_restr0.0121482

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