Annotations: 5E8D

Crystal structure of human epiregulin in complex with the Fab fragment of murine monoclonal antibody 9E5

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d5e8da_	Small proteins	Knottins (small inhibitors, toxins, lectins)	EGF/Laminin	EGF-type module	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B [auth H]	d5e8dh_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
C [auth L]	d5e8dl2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
C [auth L]	d5e8dl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	EGF/Laminin-like	8036173	3000412	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PRMT_C	e5e8dA1	A: alpha arrays	X: Repetitive alpha hairpins	H: Dimerization domain of heterocyst differentiation protein HetR	T: Dimerization domain of heterocyst differentiation protein HetR	F: PRMT_C	ECOD (v295)
B [auth H]	PRMT_C	e5e8dH1	A: alpha arrays	X: Repetitive alpha hairpins	H: Dimerization domain of heterocyst differentiation protein HetR	T: Dimerization domain of heterocyst differentiation protein HetR	F: PRMT_C	ECOD (v295)
B [auth H]	NTP_transferase	e5e8dH2	A: alpha arrays	X: Lipocalins/Streptavidin	H: SAM/DNA-glycosylase	T: SAM domain-like	F: NTP_transferase	ECOD (v295)
C [auth L]	PRMT_C	e5e8dL1	A: alpha arrays	X: Repetitive alpha hairpins	H: Dimerization domain of heterocyst differentiation protein HetR	T: Dimerization domain of heterocyst differentiation protein HetR	F: PRMT_C	ECOD (v295)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.10.25.10	Mainly Beta	Ribbon	Laminin	Laminin	CATH (4.3.0)
B [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
B [auth H]	9E5 Fab, anti-human epiregulin	VH-CH1	Mus musculus (house mouse)	IGHV14-302, IGHJ301, IGHG1*02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202624-0)
C [auth L]	9E5 Fab, anti-human epiregulin	L-KAPPA	Mus musculus (house mouse)	IGKV19-9301, IGKV19-9302, IGKJ101, IGKJ201, IGKC01, IGKC02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202624-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth H]	Heavy Chain	IGHV14	-	proepiregulin	SAbDab (2026-06-26)
C [auth L]	Light Chain	IGKV19	Kappa	proepiregulin	SAbDab (2026-06-26)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Proepiregulin	molecular function activator activity molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity growth factor activity protein tyrosine kinase activator activity enzyme regulator activity transmembrane receptor protein tyrosine kinase activator activity protein kinase regulator activity kinase activator activity enzyme activator activity protein kinase activator activity kinase regulator activity molecular function activator activity molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity growth factor activity protein tyrosine kinase activator activity enzyme regulator activity transmembrane receptor protein tyrosine kinase activator activity protein kinase regulator activity kinase activator activity enzyme activator activity protein kinase activator activity kinase regulator activity epidermal growth factor receptor binding protein binding binding signaling receptor binding growth factor receptor binding	regulation of cellular process negative regulation of biological process RNA metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of cellular process negative regulation of biological process RNA metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of biosynthetic process negative regulation of DNA-templated transcription regulation of biological process negative regulation of metabolic process biological regulation primary metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process metabolic process cellular process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process negative regulation of RNA metabolic process developmental process sexual reproduction cellular developmental process reproductive process multicellular organismal reproductive process oogenesis cell development cellular process involved in reproduction in multicellular organism developmental process involved in reproduction female gamete generation gamete generation cell differentiation anatomical structure development germ cell development primary follicle stage mammalian oogenesis stage cellular response to stimulus cell surface receptor signaling pathway response to stimulus signaling response to cytokine cytokine-mediated signaling pathway cell communication response to peptide response to chemical cellular response to cytokine stimulus signal transduction epithelium development epidermal cell differentiation epidermis development animal organ development tissue development epithelial cell differentiation skin development keratinocyte differentiation response to hormone response to endogenous stimulus response to peptide hormone response to oxygen-containing compound response to nitrogen compound anatomical structure morphogenesis animal organ morphogenesis ERBB2 signaling pathway ERBB4 signaling pathway cell surface receptor protein tyrosine kinase signaling pathway ERBB signaling pathway enzyme-linked receptor protein signaling pathway ERBB2-ERBB4 signaling pathway multicellular organismal process blood vessel morphogenesis tube development angiogenesis vasculature development circulatory system development multicellular organism development tube morphogenesis anatomical structure formation involved in morphogenesis blood vessel development system development interleukin-6 production positive regulation of biological process positive regulation of macromolecule biosynthetic process positive regulation of interleukin-6 production regulation of interleukin-6 production positive regulation of metabolic process positive regulation of biosynthetic process regulation of cytokine production cytokine production regulation of multicellular organismal process positive regulation of macromolecule metabolic process positive regulation of cellular process positive regulation of gene expression positive regulation of multicellular organismal process positive regulation of cytokine production fibroblast proliferation cell population proliferation positive regulation of cell population proliferation regulation of fibroblast proliferation regulation of cell population proliferation positive regulation of fibroblast proliferation positive regulation of DNA replication DNA metabolic process DNA replication positive regulation of DNA metabolic process regulation of DNA metabolic process regulation of DNA replication epithelial cell proliferation keratinocyte proliferation ovulation organelle fission meiotic cell cycle meiotic cell cycle process cellular component organization nuclear division organelle organization female meiotic nuclear division meiotic nuclear division cellular component organization or biogenesis cell cycle cell cycle process cell-cell signaling smooth muscle cell differentiation regulation of developmental process negative regulation of developmental process regulation of smooth muscle cell differentiation negative regulation of muscle cell differentiation regulation of cell differentiation muscle cell differentiation muscle structure development negative regulation of smooth muscle cell differentiation regulation of muscle cell differentiation negative regulation of cell differentiation positive regulation of cell division cell division regulation of cell division positive regulation of organelle organization regulation of cellular component organization positive regulation of cellular component organization regulation of mitotic nuclear division positive regulation of mitotic nuclear division mitotic cell cycle regulation of mitotic cell cycle positive regulation of cell cycle process regulation of cell cycle mitotic nuclear division regulation of cell cycle process positive regulation of nuclear division regulation of organelle organization positive regulation of cell cycle mitotic cell cycle process regulation of nuclear division G protein-coupled receptor signaling pathway luteinizing hormone signaling pathway developmental maturation oocyte development anatomical structure maturation oocyte maturation oocyte differentiation cell maturation mRNA transcription mRNA metabolic process epidermal growth factor receptor signaling pathway negative regulation of cell population proliferation wound healing response to stress response to wounding regulation of smooth muscle cell proliferation smooth muscle cell proliferation positive regulation of smooth muscle cell proliferation muscle cell proliferation positive regulation of phosphorylation phosphorylation positive regulation of phosphate metabolic process phosphate-containing compound metabolic process regulation of phosphorylation ERBB2-EGFR signaling pathway ovulation cycle process developmental growth sex differentiation development of primary female sexual characteristics ovulation cycle development of primary sexual characteristics ovarian cumulus expansion reproductive structure development ovarian follicle development rhythmic process gonad development reproductive system development female gonad development growth female sex differentiation fused antrum stage antral ovarian follicle growth regulation of protein modification process regulation of catalytic activity regulation of protein phosphorylation positive regulation of protein metabolic process regulation of transferase activity positive regulation of molecular function positive regulation of protein modification process protein metabolic process positive regulation of protein kinase activity protein modification process positive regulation of protein phosphorylation protein phosphorylation regulation of protein metabolic process positive regulation of catalytic activity regulation of protein kinase activity regulation of molecular function positive regulation of kinase activity regulation of kinase activity macromolecule modification regulation of epithelial cell proliferation negative regulation of epithelial cell proliferation regulation of defense response positive regulation of response to biotic stimulus regulation of response to biotic stimulus biological process involved in interspecies interaction between organisms regulation of response to external stimulus response to biotic stimulus positive regulation of response to stimulus positive regulation of response to external stimulus positive regulation of immune response regulation of response to stress innate immune response regulation of immune system process response to external biotic stimulus positive regulation of immune system process positive regulation of innate immune response defense response immune response response to other organism regulation of innate immune response defense response to symbiont response to external stimulus regulation of response to stimulus immune system process defense response to other organism positive regulation of defense response regulation of immune response ERBB4-ERBB4 signaling pathway	membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular organelle cellular anatomical structure bounding membrane of organelle cytoplasmic vesicle vesicle membrane clathrin-coated vesicle endocytic vesicle membrane coated vesicle vesicle endocytic vesicle clathrin-coated vesicle membrane membrane-bounded organelle intracellular anatomical structure intracellular vesicle intracellular organelle cellular anatomical structure bounding membrane of organelle cytoplasmic vesicle vesicle membrane clathrin-coated vesicle endocytic vesicle membrane coated vesicle vesicle endocytic vesicle clathrin-coated vesicle membrane clathrin-coated endocytic vesicle membrane membrane intracellular membrane-bounded organelle clathrin-coated endocytic vesicle cytoplasmic vesicle membrane coated vesicle membrane organelle cytoplasm organelle membrane cell periphery plasma membrane extracellular region
B [auth H]	anti-human epiregulin antibody 9E5 Fab heavy chain	-	-	-
C [auth L]	anti-human epiregulin antibody 9E5 Fab light chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR000742	EGF-like domain	Domain
A	IPR060357	Epiregulin, C-terminal helix	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: O14944	erythropoietic protoporphyria psoriasis spina bifida acute myeloid leukemia Crohn disease gastric carcinoma interstitial cystitis Malignant neoplasm of ovary ovarian cancer rheumatoid arthritis tuberculosis atopic eczema cutaneous lupus erythematosus hepatocellular carcinoma lung cancer erythropoietic protoporphyria psoriasis spina bifida acute myeloid leukemia Crohn disease gastric carcinoma interstitial cystitis Malignant neoplasm of ovary ovarian cancer rheumatoid arthritis tuberculosis atopic eczema cutaneous lupus erythematosus hepatocellular carcinoma lung cancer malignant pancreatic neoplasm ovarian neoplasm Sjogren syndrome ulcerative colitis breast cancer cystic fibrosis gastric cancer IgA glomerulonephritis MALT lymphoma

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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.