5NQW | pdb_00005nqw

IgE-Fc in complex with single domain antibody 026

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	C1-set	e5nqwB2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set	ECOD (1.6)
A	C1-set	e5nqwA2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set	ECOD (1.6)
D	V-set_12	e5nqwD1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_12	ECOD (1.6)
C	V-set_12	e5nqwC1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_12	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	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
A, B	Fc-epsilon (IGHE)	CH3-CH4	Homo sapiens (human)	IGHE01, IGHE02, IGHE*04	C-DOMAIN CH3, C-DOMAIN CH4	IG	CH3-CH4	IMGT (202549-0)
C, D	single domain antibody 026	VH	Homo sapiens (human)	IGHV3-2303, IGHJ401, IGHJ402, IGHJ403	V-DOMAIN VH	IG	VH	IMGT (202549-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C, D	Heavy Chain	IGHV3	-	immunoglobulin heavy constant epsilon	SAbDab (2025-12-19)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Immunoglobulin heavy constant epsilon	protein binding binding signaling receptor binding immunoglobulin receptor binding antigen binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity B cell antigen processing and presentation response to stimulus immune response adaptive immune response immune effector process antigen processing and presentation immune system process B cell mediated immunity leukocyte mediated immunity myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity B cell antigen processing and presentation response to stimulus immune response adaptive immune response immune effector process antigen processing and presentation immune system process B cell mediated immunity leukocyte mediated immunity myeloid leukocyte mediated immunity inflammatory response to antigenic stimulus response to stress antibody-dependent cellular cytotoxicity acute inflammatory response hypersensitivity defense response leukocyte mediated cytotoxicity acute inflammatory response to antigenic stimulus immunoglobulin mediated immune response type II hypersensitivity type IIa hypersensitivity cellular process inflammatory response cell killing cellular response to stimulus immune response-regulating cell surface receptor signaling pathway regulation of cellular process signaling positive regulation of biological process cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process regulation of biological process cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway B cell receptor signaling pathway biological regulation regulation of response to stimulus regulation of immune response antigen receptor-mediated signaling pathway activation of immune response humoral immune response complement activation humoral immune response mediated by circulating immunoglobulin complement activation, classical pathway primary adaptive immune response biological process involved in interspecies interaction between organisms response to other organism antibacterial humoral response defense response to symbiont response to external stimulus antimicrobial humoral response response to biotic stimulus defense response to bacterium defense response to other organism response to bacterium response to external biotic stimulus multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation lymphocyte proliferation regulated exocytosis cellular localization transport eosinophil activation cell activation involved in immune response leukocyte degranulation vesicle-mediated transport myeloid leukocyte activation localization secretion by cell establishment of localization in cell leukocyte activation involved in immune response eosinophil degranulation eosinophil activation involved in immune response secretion export from cell establishment of localization myeloid cell activation involved in immune response exocytosis eosinophil mediated immunity granulocyte activation establishment of organelle localization organelle localization mast cell activation mast cell mediated immunity vacuolar localization mast cell degranulation mast cell activation involved in immune response lysosome localization developmental process myeloid leukocyte differentiation cellular developmental process hemopoiesis macrophage differentiation cell development mononuclear cell differentiation myeloid cell differentiation cell differentiation anatomical structure development leukocyte differentiation type 2 immune response import into cell Fc receptor-mediated immune complex endocytosis receptor-mediated endocytosis endocytosis adaptive immune memory response immunological memory process type I hypersensitivity macrophage activation	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex IgE immunoglobulin complex immunoglobulin complex extracellular region extracellular space immunoglobulin complex, circulating plasma membrane protein complex membrane protein complex IgE B cell receptor complex receptor complex cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex IgE immunoglobulin complex immunoglobulin complex extracellular region extracellular space immunoglobulin complex, circulating plasma membrane protein complex membrane protein complex IgE B cell receptor complex receptor complex B cell receptor complex plasma membrane signaling receptor complex
C, D	026	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A, B	IPR003597	Immunoglobulin C1-set	Domain
A, B	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site
A, B	IPR050380	Immune Recognition and Response Modulators	Family
A, B	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, B	IPR007110	Immunoglobulin-like domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P01854	asthma seasonal allergic rhinitis Chronic idiopathic urticaria psoriasis

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.