9EQ4 | pdb_00009eq4

Structure of IgE HMM5 bound to FceRIa cryo-EM class 5

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD 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 R]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8054823	3000071	SCOP2B (2022-06-29)
C [auth R]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8055592	3000071	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 [auth H]	WD40	e9eq4H1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)
D [auth X]	WD40	e9eq4X1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)
E [auth Y]	WD40	e9eq4Y1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)
B [auth L]	WD40	e9eq4L1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)
C [auth R]	WD40	e9eq4R1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: WD40	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A [auth H], D [auth X]	Heavy Chain	IGHV1	-	-	SAbDab (2026-06-12)
B [auth L], E [auth Y]	Light Chain	IGKV1	Kappa	-	SAbDab (2026-06-12)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth R]	PF13927	Immunoglobulin domain (Ig_3)	Immunoglobulin domain	This family contains immunoglobulin-like domains.	Domain
C [auth R]	PF13895	Immunoglobulin domain (Ig_2)	Immunoglobulin domain	This domain contains immunoglobulin-like domains.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth H], D [auth X]	IgE HMM5 heavy chain	-	-	-
B [auth L], E [auth Y]	IgE HMM5 light chain	-	-	-
C [auth R]	High affinity immunoglobulin epsilon receptor subunit alpha	high-affinity IgE receptor activity molecular transducer activity immunoglobulin receptor activity transmembrane signaling receptor activity signaling receptor activity immune receptor activity IgE receptor activity IgE binding protein-containing complex binding binding immunoglobulin binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response immune system process B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process cellular response to stimulus regulation of biological process regulation of cellular process cell surface receptor signaling pathway adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response immune system process B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process cellular response to stimulus regulation of biological process regulation of cellular process cell surface receptor signaling pathway signaling biological regulation cellular process signal transduction cell communication multicellular organismal process regulated exocytosis cellular localization transport eosinophil activation cell activation involved in immune response leukocyte degranulation myeloid leukocyte mediated immunity vesicle-mediated transport myeloid leukocyte activation 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 cell activation 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 type 2 immune response hypersensitivity defense response acute inflammatory response to antigenic stimulus type I hypersensitivity inflammatory response to antigenic stimulus response to stress inflammatory response acute inflammatory response	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth R]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
C [auth R]	IPR003598	Immunoglobulin subtype 2	Domain
C [auth R]	IPR050488	Immunoglobulin Fc region receptor	Family
C [auth R]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C [auth R]	IPR003599	Immunoglobulin domain subtype	Domain
C [auth R]	IPR007110	Immunoglobulin-like domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C [auth R]	: P12319	urticaria Drug Eruptions drug allergy pilocytic astrocytoma acute myeloid leukemia chronic obstructive pulmonary disease head and neck cancer lung cancer ovarian cancer psoriasis atopic eczema cutaneous lupus erythematosus esophageal adenocarcinoma interstitial cystitis malignant pancreatic neoplasm urticaria Drug Eruptions drug allergy pilocytic astrocytoma acute myeloid leukemia chronic obstructive pulmonary disease head and neck cancer lung cancer ovarian cancer psoriasis atopic eczema cutaneous lupus erythematosus esophageal adenocarcinoma interstitial cystitis malignant pancreatic neoplasm non-small cell lung carcinoma pancreatic intraductal papillary-mucinous carcinoma tuberculosis Barrett esophagus exocrine pancreatic carcinoma invasive ductal breast carcinoma MALT lymphoma osteosarcoma

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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.