Annotations: 9T3S

Structure of human HER2 in complex with EPS226 Fab

External Resource: Annotation

Domain Annotation: SCOP2 Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C [auth A]	SCOP2B Superfamily	L domain-like	8043690	3001010	SCOP2B (2022-06-29)
C [auth A]	SCOP2B Superfamily	L domain-like	8043691	3001010	SCOP2B (2022-06-29)
C [auth A]	SCOP2B Superfamily	Growth factor receptor domain-like	8043692	3000398	SCOP2B (2022-06-29)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth L]	Light Chain	IGLV2	Lambda	receptor tyrosine-protein kinase erbb-2	SAbDab (2026-04-24)
A [auth H]	Heavy Chain	IGHV1	-	receptor tyrosine-protein kinase erbb-2	SAbDab (2026-04-24)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth A]	PF00757	Furin-like cysteine rich region (Furin-like)	Furin-like cysteine rich region		Domain
C [auth A]	PF01030	Receptor L domain (Recep_L_domain)	Receptor L domain	-	Repeat

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth A]	Receptor tyrosine-protein kinase erbB-2	molecular transducer activity coreceptor activity signaling receptor activity RNA polymerase I core binding RNA polymerase binding protein binding binding RNA polymerase core enzyme binding enzyme binding catalytic activity, acting on a protein kinase activity protein kinase activity transferase activity phosphotransferase activity, alcohol group as acceptor molecular transducer activity coreceptor activity signaling receptor activity RNA polymerase I core binding RNA polymerase binding protein binding binding RNA polymerase core enzyme binding enzyme binding catalytic activity, acting on a protein kinase activity protein kinase activity transferase activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups protein tyrosine kinase activity transmembrane receptor protein tyrosine kinase activity transmembrane receptor protein kinase activity transmembrane signaling receptor activity catalytic activity adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding protein tyrosine kinase binding kinase binding signaling receptor binding receptor tyrosine kinase binding protein kinase binding identical protein binding protein heterodimerization activity protein dimerization activity ErbB-3 class receptor binding	protein localization to postsynaptic specialization membrane protein localization to postsynaptic membrane protein localization to cell periphery cellular localization protein localization to synapse biological regulation localization within membrane protein localization to membrane protein-containing complex localization neurotransmitter receptor localization to postsynaptic specialization membrane localization regulation of postsynaptic membrane neurotransmitter receptor levels macromolecule localization protein localization to organelle protein localization to postsynaptic specialization membrane protein localization to postsynaptic membrane protein localization to cell periphery cellular localization protein localization to synapse biological regulation localization within membrane protein localization to membrane protein-containing complex localization neurotransmitter receptor localization to postsynaptic specialization membrane localization regulation of postsynaptic membrane neurotransmitter receptor levels macromolecule localization protein localization to organelle cellular process protein localization to postsynapse intracellular protein localization regulation of biological quality protein localization to cell junction receptor localization to synapse developmental process multicellular organismal process regulation of multicellular organismal development regulation of biological process regulation of developmental process blood vessel morphogenesis tube development angiogenesis vasculature development regulation of vasculature development circulatory system development anatomical structure morphogenesis multicellular organism development tube morphogenesis regulation of angiogenesis anatomical structure formation involved in morphogenesis anatomical structure development regulation of multicellular organismal process regulation of anatomical structure morphogenesis blood vessel development system development heart development animal organ development cellular response to stimulus ERBB2 signaling pathway ERBB4 signaling pathway regulation of cellular process cell surface receptor signaling pathway response to stimulus signaling cell surface receptor protein tyrosine kinase signaling pathway cell communication ERBB signaling pathway signal transduction enzyme-linked receptor protein signaling pathway ERBB2-ERBB4 signaling pathway cell population proliferation cellular developmental process immature T cell proliferation in thymus cell development mononuclear cell differentiation lymphocyte activation lymphocyte differentiation leukocyte proliferation leukocyte activation T cell differentiation in thymus T cell activation cell differentiation lymphocyte proliferation T cell differentiation T cell proliferation hemopoiesis cell activation immature T cell proliferation immune system process mononuclear cell proliferation leukocyte differentiation ERBB2-ERBB3 signaling pathway ERBB3 signaling pathway epidermal growth factor receptor signaling pathway negative regulation of lymphocyte proliferation regulation of leukocyte differentiation regulation of leukocyte activation negative regulation of biological process regulation of cell activation negative regulation of T cell differentiation in thymus regulation of cell differentiation negative regulation of T cell proliferation regulation of cell development negative regulation of cell adhesion negative regulation of T cell differentiation negative regulation of leukocyte proliferation regulation of immune system process regulation of immature T cell proliferation negative regulation of hemopoiesis regulation of leukocyte proliferation negative regulation of immature T cell proliferation negative regulation of leukocyte differentiation regulation of immature T cell proliferation in thymus negative regulation of T cell activation negative regulation of leukocyte cell-cell adhesion regulation of cell population proliferation negative regulation of cell-cell adhesion negative regulation of lymphocyte differentiation regulation of leukocyte cell-cell adhesion negative regulation of multicellular organismal process negative regulation of leukocyte activation regulation of T cell differentiation in thymus negative regulation of lymphocyte activation leukocyte cell-cell adhesion regulation of T cell differentiation negative regulation of mononuclear cell proliferation cell adhesion cell-cell adhesion negative regulation of cellular process negative regulation of cell differentiation regulation of cell-cell adhesion negative regulation of immature T cell proliferation in thymus regulation of lymphocyte proliferation regulation of lymphocyte differentiation negative regulation of cell population proliferation negative regulation of developmental process regulation of cell adhesion regulation of T cell activation negative regulation of cell activation negative regulation of cell development regulation of T cell proliferation negative regulation of immune system process regulation of hemopoiesis regulation of mononuclear cell proliferation regulation of lymphocyte activation protein phosphorylation phosphorylation primary metabolic process macromolecule modification phosphate-containing compound metabolic process metabolic process protein metabolic process macromolecule metabolic process protein modification process phosphorus metabolic process regulation of signaling regulation of signal transduction regulation of MAPK cascade intracellular signal transduction regulation of intracellular signal transduction regulation of response to stimulus intracellular signaling cassette MAPK cascade regulation of cell communication ERK1 and ERK2 cascade regulation of ERK1 and ERK2 cascade ERBB2-EGFR signaling pathway regulation of localization establishment of protein localization regulation of protein localization protein targeting positive regulation of biological process positive regulation of establishment of protein localization regulation of protein targeting to membrane positive regulation of cellular process establishment of protein localization to membrane regulation of establishment of protein localization establishment of localization protein targeting to membrane regulation of cellular localization regulation of protein targeting positive regulation of protein targeting to membrane regulation of growth regulation of cellular component organization growth positive regulation of cell growth regulation of cell growth cell growth cellular component organization positive regulation of growth cellular component organization or biogenesis nervous system development neurogenesis central nervous system development gliogenesis oligodendrocyte differentiation glial cell differentiation phosphatidylinositol 3-kinase/protein kinase B signal transduction negative regulation of programmed cell death regulation of apoptotic process regulation of programmed cell death cell death negative regulation of apoptotic process apoptotic process programmed cell death peripheral nervous system development glial cell development Schwann cell development Schwann cell differentiation cell junction organization neuromuscular junction development synapse organization axonogenesis cell projection organization motor neuron axon guidance plasma membrane bounded cell projection morphogenesis neuron projection development cell morphogenesis cell projection morphogenesis neuron differentiation neuron projection morphogenesis plasma membrane bounded cell projection organization axon guidance axon development cell morphogenesis involved in neuron differentiation generation of neurons neuron projection guidance neuron development positive regulation of cell communication small GTPase-mediated signal transduction positive regulation of signal transduction regulation of small GTPase mediated signal transduction Rho protein signal transduction positive regulation of response to stimulus positive regulation of intracellular signal transduction regulation of Rho protein signal transduction positive regulation of Rho protein signal transduction positive regulation of small GTPase mediated signal transduction positive regulation of signaling positive regulation of cell population proliferation positive regulation of epithelial cell proliferation regulation of epithelial cell proliferation epithelial cell proliferation positive regulation of cell adhesion positive regulation of protein metabolic process positive regulation of translation protein biosynthetic process positive regulation of macromolecule biosynthetic process regulation of primary metabolic process post-transcriptional regulation of gene expression positive regulation of metabolic process positive regulation of biosynthetic process positive regulation of macromolecule metabolic process regulation of biosynthetic process regulation of protein metabolic process regulation of macromolecule metabolic process gene expression translation macromolecule biosynthetic process regulation of gene expression biosynthetic process positive regulation of gene expression regulation of translation regulation of macromolecule biosynthetic process regulation of metabolic process peptidyl-tyrosine modification peptidyl-amino acid modification peptidyl-tyrosine phosphorylation positive regulation of phosphorylation regulation of catalytic activity regulation of transferase activity positive regulation of phosphate metabolic process regulation of MAP kinase activity positive regulation of protein serine/threonine kinase activity positive regulation of protein phosphorylation positive regulation of MAP kinase activity positive regulation of phosphorus metabolic process positive regulation of MAPK cascade regulation of molecular function positive regulation of kinase activity regulation of kinase activity regulation of protein serine/threonine kinase activity regulation of phosphorus metabolic process regulation of protein modification process regulation of protein phosphorylation positive regulation of molecular function positive regulation of protein modification process positive regulation of protein kinase activity positive regulation of catalytic activity regulation of protein kinase activity regulation of phosphorylation semaphorin-plexin signaling pathway cellular response to endogenous stimulus cellular response to growth factor stimulus response to endogenous stimulus response to growth factor wound healing response to stress response to wounding positive regulation of DNA-templated transcription RNA metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process transcription by RNA polymerase I regulation of nucleobase-containing compound metabolic process positive regulation of transcription by RNA polymerase I regulation of RNA biosynthetic process regulation of transcription by RNA polymerase I nucleobase-containing compound biosynthetic process nucleic acid metabolic process positive regulation of RNA metabolic process positive regulation of RNA biosynthetic process regulation of DNA-templated transcription myelination axon ensheathment ensheathment of neurons cellular response to epidermal growth factor stimulus response to epidermal growth factor regulation of microtubule-based process microtubule-based process	cellular anatomical structure membrane intracellular anatomical structure cytoplasm cytosol cell periphery protein-containing complex plasma membrane protein complex plasma membrane plasma membrane signaling receptor complex membrane protein complex signaling receptor complex ERBB3:ERBB2 complex presynapse cellular anatomical structure membrane intracellular anatomical structure cytoplasm cytosol cell periphery protein-containing complex plasma membrane protein complex plasma membrane plasma membrane signaling receptor complex membrane protein complex signaling receptor complex ERBB3:ERBB2 complex presynapse synapse cell junction presynaptic membrane plasma membrane region synaptic membrane basal part of cell basal plasma membrane basolateral plasma membrane semaphorin receptor complex neuromuscular junction perinuclear region of cytoplasm endosome membrane membrane-bounded organelle endosome intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle cytoplasmic vesicle membrane bounding membrane of organelle vesicle membrane cytoplasmic vesicle organelle vesicle organelle membrane myelin sheath apical part of cell apical plasma membrane ruffle cell leading edge leading edge membrane plasma membrane bounded cell projection cell projection ruffle membrane cell projection membrane nucleus membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen early endosome
B [auth L]	EPS226 Fab LC	-	-	-
A [auth H]	EPS226 Fab HC	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth A]	IPR016245	Tyrosine protein kinase, EGF/ERB/XmrK receptor	Family
C [auth A]	IPR008266	Tyrosine-protein kinase, active site	Active Site
C [auth A]	IPR020635	Tyrosine-protein kinase, catalytic domain	Domain
C [auth A]	IPR000719	Protein kinase domain	Domain
C [auth A]	IPR036941	Receptor L-domain superfamily	Homologous Superfamily
C [auth A]	IPR032778	Growth factor receptor domain 4	Domain
C [auth A]	IPR049328	Epidermal growth factor receptor-like, transmembrane-juxtamembrane segment	Domain
C [auth A]	IPR006212	Furin-like repeat	Repeat
C [auth A]	IPR000494	Receptor L-domain	Domain
C [auth A]	IPR017441	Protein kinase, ATP binding site	Binding Site
C [auth A]	IPR001245	Serine-threonine/tyrosine-protein kinase, catalytic domain	Domain
C [auth A]	IPR011009	Protein kinase-like domain superfamily	Homologous Superfamily
C [auth A]	IPR006211	Furin-like cysteine-rich domain	Domain
C [auth A]	IPR009030	Growth factor receptor cysteine-rich domain superfamily	Homologous Superfamily
C [auth A]	IPR050122	Receptor Tyrosine Kinase	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth A]	: P04626	lung cancer gastric cancer ovarian cancer Lymphatic Metastasis cholangiocarcinoma prostate cancer medulloblastoma invasive ductal breast carcinoma nasopharyngeal carcinoma breast carcinoma malignant glioma papilloma renal cell carcinoma childhood medulloblastoma head and neck cancer lung cancer gastric cancer ovarian cancer Lymphatic Metastasis cholangiocarcinoma prostate cancer medulloblastoma invasive ductal breast carcinoma nasopharyngeal carcinoma breast carcinoma malignant glioma papilloma renal cell carcinoma childhood medulloblastoma head and neck cancer adenocarcinoma adult medulloblastoma intrahepatic cholangiocarcinoma mixed glioma ductal breast carcinoma in situ ulcerative colitis breast cancer neuroblastoma papillary renal cell carcinoma glioblastoma glioma susceptibility 1 collecting duct carcinoma sarcomatoid renal cell carcinoma melanotic medulloblastoma skin basal cell carcinoma squamous papilloma lung carcinoma gallbladder cancer urinary bladder cancer glioma malignant pancreatic neoplasm chromophobe renal cell carcinoma granular cell carcinoma hereditary diffuse gastric adenocarcinoma medullomyoblastoma with myogenic differentiation esophageal cancer tubular adenocarcinoma malignant colon neoplasm ovarian carcinoma gastric carcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia papillomatosis clear cell renal carcinoma primary biliary cholangitis mammary neoplasms, animal colonic neoplasm marginal zone lymphoma sarcoma melanoma Crohn disease astrocytoma (excluding glioblastoma) skin pigmented basal cell carcinoma liver disease benign colon neoplasm neoplasm of esophagus ependymoma subependymoma biliary tract neoplasm malignant ependymoma non-small cell lung carcinoma ovarian neoplasm gastric neoplasm carcinoma peripheral nervous system disease head and neck carcinoma colorectal adenocarcinoma renal carcinoma cribriform carcinoma inflammatory bowel disease desmoplastic/nodular medulloblastoma atopic eczema lung adenocarcinoma benign neoplasm of stomach systemic lupus erythematosus bipolar disorder lymphoma neutropenia cancer pancreatic ductal adenocarcinoma peripheral neuropathy colonic disease head and neck neoplasm colorectal cancer cribriform carcinoma of breast interstitial cystitis digestive system cancer skin disease leukemia atypical teratoid rhabdoid tumor endometriosis stomach carcinoma in situ lung benign neoplasm bile duct cancer breast adenocarcinoma gallbladder neoplasm breast fibroadenoma

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.