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- PDB-9t3r: Structure of human HER2 in complex with EPS232 Fab -

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Basic information

Entry
Database: PDB / ID: 9t3r
TitleStructure of human HER2 in complex with EPS232 Fab
Components
  • EPS232 Fab HC
  • Ig-like domain-containing protein
  • Receptor tyrosine-protein kinase erbB-2
KeywordsANTITUMOR PROTEIN / Antibody Fab / Complex / cancer / extracellular domain.
Function / homology
Function and homology information


negative regulation of immature T cell proliferation in thymus / ERBB3:ERBB2 complex / ERBB2-ERBB4 signaling pathway / GRB7 events in ERBB2 signaling / RNA polymerase I core binding / immature T cell proliferation in thymus / semaphorin receptor complex / ErbB-3 class receptor binding / motor neuron axon guidance / Sema4D induced cell migration and growth-cone collapse ...negative regulation of immature T cell proliferation in thymus / ERBB3:ERBB2 complex / ERBB2-ERBB4 signaling pathway / GRB7 events in ERBB2 signaling / RNA polymerase I core binding / immature T cell proliferation in thymus / semaphorin receptor complex / ErbB-3 class receptor binding / motor neuron axon guidance / Sema4D induced cell migration and growth-cone collapse / regulation of microtubule-based process / PLCG1 events in ERBB2 signaling / enzyme-linked receptor protein signaling pathway / ERBB2 Activates PTK6 Signaling / ERBB2-EGFR signaling pathway / neurotransmitter receptor localization to postsynaptic specialization membrane / ERBB2-ERBB3 signaling pathway / Drug-mediated inhibition of ERBB2 signaling / Resistance of ERBB2 KD mutants to trastuzumab / Resistance of ERBB2 KD mutants to sapitinib / Resistance of ERBB2 KD mutants to tesevatinib / Resistance of ERBB2 KD mutants to neratinib / Resistance of ERBB2 KD mutants to osimertinib / Resistance of ERBB2 KD mutants to afatinib / Resistance of ERBB2 KD mutants to AEE788 / Resistance of ERBB2 KD mutants to lapatinib / Drug resistance in ERBB2 TMD/JMD mutants / neuromuscular junction development / positive regulation of Rho protein signal transduction / positive regulation of MAP kinase activity / positive regulation of transcription by RNA polymerase I / ERBB2 Regulates Cell Motility / oligodendrocyte differentiation / semaphorin-plexin signaling pathway / PI3K events in ERBB2 signaling / regulation of angiogenesis / positive regulation of protein targeting to membrane / Schwann cell development / regulation of ERK1 and ERK2 cascade / coreceptor activity / Signaling by ERBB2 / TFAP2 (AP-2) family regulates transcription of growth factors and their receptors / myelination / transmembrane receptor protein tyrosine kinase activity / positive regulation of cell adhesion / GRB2 events in ERBB2 signaling / SHC1 events in ERBB2 signaling / peptidyl-tyrosine phosphorylation / cell surface receptor protein tyrosine kinase signaling pathway / Constitutive Signaling by Overexpressed ERBB2 / Downregulation of ERBB2:ERBB3 signaling / cellular response to epidermal growth factor stimulus / basal plasma membrane / positive regulation of epithelial cell proliferation / positive regulation of translation / neuromuscular junction / phosphatidylinositol 3-kinase/protein kinase B signal transduction / wound healing / Signaling by ERBB2 TMD/JMD mutants / receptor protein-tyrosine kinase / Signaling by ERBB2 ECD mutants / Signaling by ERBB2 KD Mutants / receptor tyrosine kinase binding / cellular response to growth factor stimulus / epidermal growth factor receptor signaling pathway / Downregulation of ERBB2 signaling / ruffle membrane / neuron differentiation / Constitutive Signaling by Aberrant PI3K in Cancer / transmembrane signaling receptor activity / PIP3 activates AKT signaling / myelin sheath / heart development / PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling / RAF/MAP kinase cascade / positive regulation of cell growth / presynaptic membrane / protein tyrosine kinase activity / basolateral plasma membrane / early endosome / protein phosphorylation / cell surface receptor signaling pathway / signaling receptor complex / positive regulation of MAPK cascade / cell population proliferation / endosome membrane / apical plasma membrane / intracellular signal transduction / protein heterodimerization activity / signaling receptor binding / negative regulation of apoptotic process / perinuclear region of cytoplasm / signal transduction / nucleoplasm / ATP binding / membrane / identical protein binding / nucleus / plasma membrane / cytosol
Similarity search - Function
: / Epidermal growth factor receptor transmembrane-juxtamembrane segment / Tyrosine protein kinase, EGF/ERB/XmrK receptor / Growth factor receptor domain 4 / Growth factor receptor domain IV / Receptor L-domain / Furin-like cysteine-rich domain / Receptor L-domain superfamily / Furin-like cysteine rich region / Receptor L domain ...: / Epidermal growth factor receptor transmembrane-juxtamembrane segment / Tyrosine protein kinase, EGF/ERB/XmrK receptor / Growth factor receptor domain 4 / Growth factor receptor domain IV / Receptor L-domain / Furin-like cysteine-rich domain / Receptor L-domain superfamily / Furin-like cysteine rich region / Receptor L domain / Furin-like repeat / Furin-like repeats / Growth factor receptor cysteine-rich domain 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. / Protein kinase domain profile. / Protein kinase domain / Protein kinase-like domain superfamily
Similarity search - Domain/homology
Receptor tyrosine-protein kinase erbB-2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsBirtley, J. / Johnson, R.M. / Regan, L. / Soni, K. / Pye, V.E. / Fitzgerald, K.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Not funded United Kingdom
CitationJournal: To Be Published
Title: Elucidating the relationship between affinity and potency in the performance of IgE as therapeutic antibodies for cancers with low antigen densities
Authors: Birtley, J. / Johnson, R.M. / Regan, L. / Soni, K. / Pye, V.E. / Fitzgerald, K.
History
DepositionOct 29, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 11, 2026Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Mar 11, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
L: Ig-like domain-containing protein
H: EPS232 Fab HC
A: Receptor tyrosine-protein kinase erbB-2


Theoretical massNumber of molelcules
Total (without water)121,6293
Polymers121,6293
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: Antibody Ig-like domain-containing protein


Mass: 22676.990 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#2: Antibody EPS232 Fab HC


Mass: 28701.863 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#3: Protein Receptor tyrosine-protein kinase erbB-2 / Metastatic lymph node gene 19 protein / MLN 19 / Proto-oncogene Neu / Proto-oncogene c-ErbB-2 / ...Metastatic lymph node gene 19 protein / MLN 19 / Proto-oncogene Neu / Proto-oncogene c-ErbB-2 / Tyrosine kinase-type cell surface receptor HER2 / p185erbB2


Mass: 70249.711 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ERBB2, HER2, MLN19, NEU, NGL / Production host: Homo sapiens (human)
References: UniProt: P04626, 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: Human HER2 in complex with EPS232 Fab / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 0.1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: 25 mAU / Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 4.39 sec. / Electron dose: 49.32 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 10400
EM imaging opticsEnergyfilter name: TFS Selectris X / Energyfilter slit width: 10 eV

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Processing

EM software
IDNameVersionCategory
1Warp1.0.9particle selection
2PHENIX1.21.2_5419model refinement
3EPU3.9image acquisition
5Warp1.0.9CTF correction
10RELION5initial Euler assignment
11RELION5final Euler assignment
12RELION5classification
13RELION53D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1662836
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 179482 / Symmetry type: POINT
RefinementHighest resolution: 3.5 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0035186
ELECTRON MICROSCOPYf_angle_d0.547048
ELECTRON MICROSCOPYf_dihedral_angle_d4.424715
ELECTRON MICROSCOPYf_chiral_restr0.043796
ELECTRON MICROSCOPYf_plane_restr0.004911

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