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- PDB-9bhx: Structure of the extracellular domain of Protein Sevenless -

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Basic information

Entry
Database: PDB / ID: 9bhx
TitleStructure of the extracellular domain of Protein Sevenless
ComponentsProtein sevenless
KeywordsSIGNALING PROTEIN / receptor tyrosine kinase / ROS1
Function / homology
Function and homology information


boss receptor activity / transmembrane receptor protein kinase activity / germ-line stem-cell niche homeostasis / R7 cell fate commitment / sevenless signaling pathway / regulation of TOR signaling / transmembrane receptor protein tyrosine kinase activity / visual perception / cell surface receptor protein tyrosine kinase signaling pathway / receptor protein-tyrosine kinase ...boss receptor activity / transmembrane receptor protein kinase activity / germ-line stem-cell niche homeostasis / R7 cell fate commitment / sevenless signaling pathway / regulation of TOR signaling / transmembrane receptor protein tyrosine kinase activity / visual perception / cell surface receptor protein tyrosine kinase signaling pathway / receptor protein-tyrosine kinase / receptor complex / ATP binding / plasma membrane
Similarity search - Function
LDLR class B repeat / Low-density lipoprotein-receptor YWTD domain / Tyrosine-protein kinase, receptor class II, conserved site / Receptor tyrosine kinase class II signature. / Six-bladed beta-propeller, TolB-like / Fibronectin type III domain / : / Fibronectin type 3 domain / Fibronectin type-III domain profile. / Fibronectin type III ...LDLR class B repeat / Low-density lipoprotein-receptor YWTD domain / Tyrosine-protein kinase, receptor class II, conserved site / Receptor tyrosine kinase class II signature. / Six-bladed beta-propeller, TolB-like / Fibronectin type III domain / : / Fibronectin type 3 domain / Fibronectin type-III domain profile. / Fibronectin type III / Fibronectin type III superfamily / Tyrosine-protein kinase, catalytic domain / Tyrosine kinase, catalytic domain / Tyrosine protein kinases specific active-site signature. / Tyrosine-protein kinase, active site / Serine-threonine/tyrosine-protein kinase, catalytic domain / Protein tyrosine and serine/threonine kinase / 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
Biological speciesDrosophila melanogaster (fruit fly)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.94 Å
AuthorsZhang, J. / Klein, D.E.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2025
Title: Structural basis for the interaction between the Drosophila RTK Sevenless (dROS1) and the GPCR BOSS.
Authors: Jianan Zhang / Yuko Tsutsui / Hengyi Li / Tongqing Li / Yueyue Wang / Salma Laraki / Sofia Alarcon-Frias / Steven E Stayrook / Daryl E Klein /
Abstract: Sevenless, the Drosophila homologue of ROS1 (University of Rochester Sarcoma) (herein, dROS1) is a receptor tyrosine kinase (RTK) essential for the differentiation of Drosophila R7 photoreceptor ...Sevenless, the Drosophila homologue of ROS1 (University of Rochester Sarcoma) (herein, dROS1) is a receptor tyrosine kinase (RTK) essential for the differentiation of Drosophila R7 photoreceptor cells. Activation of dROS1 is mediated by binding to the extracellular region (ECR) of the GPCR (G protein coupled receptor) BOSS (Bride Of Sevenless) on adjacent cells. Activation of dROS1 by BOSS leads to subsequent downstream signaling pathways including SOS (Son of Sevenless). However, the physical basis for how dROS1 interacts with BOSS has long remained unknown. Here we provide a cryo-EM structure of dROS1's extracellular region, which mediates ligand binding. We show that the extracellular region of dROS1 adopts a folded-over conformation stabilized by an N-terminal domain comprised of two disulfide stapled helical hairpins. We further narrowed down the interacting binding epitopes on both dROS1 and BOSS using hydrogen-deuterium exchange mass spectrometry (HDX-MS). This includes beta-strands in dROS1's third Fibronectin type III (FNIII) domain and a C-terminal peptide in BOSS' ECR. Our mutagenesis studies, coupled with AlphaFold complex predictions, support a binding interaction mediated by a hydrophobic interaction and beta-strand augmentation between these regions. Our findings provide a fundamental understanding of the regulatory function of dROS1 and further provide mechanistic insight into the human ortholog and oncogene ROS1.
History
DepositionApr 22, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 22, 2025Provider: repository / Type: Initial release
Revision 1.1Feb 5, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _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 / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Protein sevenless


Theoretical massNumber of molelcules
Total (without water)181,0291
Polymers181,0291
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Protein sevenless


Mass: 181029.219 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Drosophila melanogaster (fruit fly) / Gene: sev, HD-265, CG18085 / Production host: Trichoplusia ni (cabbage looper)
References: UniProt: P13368, receptor protein-tyrosine kinase
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: Protein sevenless / Type: CELL / Details: Monomeric / Entity ID: all / Source: NATURAL
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPES1
2150 mMsodium chlorideNaCl1
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 R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 289.15 K

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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 defocus max: 2600 nm / Nominal defocus min: 1800 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Image recordingElectron dose: 50.56 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.94 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 144311 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0138608
ELECTRON MICROSCOPYf_angle_d1.31311721
ELECTRON MICROSCOPYf_dihedral_angle_d4.7931151
ELECTRON MICROSCOPYf_chiral_restr0.0451244
ELECTRON MICROSCOPYf_plane_restr0.0091542

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