Annotations: 2QTJ

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
H [auth D]	C1-set_3	e2qtjD4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_3	ECOD (1.6)
H [auth D]	C1-set	e2qtjD2	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)
H [auth D]	V-set_8	e2qtjD1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
H [auth D]	C1-set_1	e2qtjD3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_1	ECOD (1.6)
G [auth C]	C1-set_3	e2qtjC4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_3	ECOD (1.6)
G [auth C]	C1-set	e2qtjC2	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)
G [auth C]	V-set_8	e2qtjC1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
G [auth C]	C1-set_1	e2qtjC3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_1	ECOD (1.6)
D [auth B]	C1-set_3	e2qtjB4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_3	ECOD (1.6)
D [auth B]	C1-set	e2qtjB2	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 [auth B]	V-set_8	e2qtjB1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
D [auth B]	C1-set_1	e2qtjB3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_1	ECOD (1.6)
C [auth A]	C1-set_3	e2qtjA4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_3	ECOD (1.6)
C [auth A]	C1-set	e2qtjA2	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)
C [auth A]	V-set_8	e2qtjA1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
C [auth A]	C1-set_1	e2qtjA3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_1	ECOD (1.6)
F [auth O]	C1-set_4	e2qtjO2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_4	ECOD (1.6)
F [auth O]	V-set	e2qtjO1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (1.6)
E [auth N]	C1-set_4	e2qtjN2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_4	ECOD (1.6)
E [auth N]	V-set	e2qtjN1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (1.6)
B [auth M]	C1-set_4	e2qtjM2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_4	ECOD (1.6)
B [auth M]	V-set	e2qtjM1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (1.6)
A [auth L]	C1-set_4	e2qtjL2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_4	ECOD (1.6)
A [auth L]	V-set	e2qtjL1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (1.6)

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
C [auth A], D [auth B], G [auth C], H [auth D]	IgA1	H-ALPHA-1	Homo sapiens (human)	IGHV1-301, IGHJ401, IGHJ402, IGHJ403, IGHA1*01	V-DOMAIN VH, C-DOMAIN CH1, C-DOMAIN CH2, C-DOMAIN CH3	IG	IG-ALPHA-1_KAPPA	IMGT (202549-0)
A [auth L], B [auth M], E [auth N], F [auth O]	IgA1	L-KAPPA	Homo sapiens (human)	IGKV1-1302, IGKV1D-1302, IGKJ401, IGKJ402, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	IG-ALPHA-1_KAPPA	IMGT (202549-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth A], D [auth B], G [auth C], H [auth D]	Heavy Chain	IGHV1	-	-	SAbDab (2025-12-19)
A [auth L], B [auth M], E [auth N], F [auth O]	Light Chain	IGKV1	Kappa	-	SAbDab (2025-12-19)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth A], D [auth B], G [auth C], H [auth D]	PF07686	Immunoglobulin V-set domain (V-set)	Immunoglobulin V-set domain	This domain is found in antibodies as well as neural protein P0 and CTL4 amongst others.	Domain
C [auth A], D [auth B], G [auth C], H [auth D]	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
C [auth A], D [auth B], G [auth C], H [auth D]	Ig alpha-1 chain C region	-	regulation of biological process positive regulation of respiratory burst regulation of cellular process biological regulation positive regulation of biological process positive regulation of metabolic process respiratory burst cellular process metabolic process regulation of respiratory burst regulation of metabolic process positive regulation of cellular process response to stimulus immune response regulation of biological process positive regulation of respiratory burst regulation of cellular process biological regulation positive regulation of biological process positive regulation of metabolic process respiratory burst cellular process metabolic process regulation of respiratory burst regulation of metabolic process positive regulation of cellular process response to stimulus immune response immune system process adaptive immune response humoral immune response biological process involved in interspecies interaction between organisms response to other organism defense response 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 stress response to bacterium response to external biotic stimulus multicellular organismal process renal system process system process glomerular filtration renal filtration	IgA immunoglobulin complex, circulating protein-containing complex monomeric IgA immunoglobulin complex cellular anatomical structure extracellular region IgA immunoglobulin complex extracellular space immunoglobulin complex, circulating immunoglobulin complex cell periphery plasma membrane membrane dimeric IgA immunoglobulin complex secretory IgA immunoglobulin complex IgA immunoglobulin complex, circulating protein-containing complex monomeric IgA immunoglobulin complex cellular anatomical structure extracellular region IgA immunoglobulin complex extracellular space immunoglobulin complex, circulating immunoglobulin complex cell periphery plasma membrane membrane dimeric IgA immunoglobulin complex secretory IgA immunoglobulin complex polymeric IgA immunoglobulin complex secretory dimeric IgA immunoglobulin complex
A [auth L], B [auth M], E [auth N], F [auth O]	Kappa light chain IgA1	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth A], D [auth B], G [auth C], H [auth D]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
C [auth A], D [auth B], G [auth C], H [auth D]	IPR050380	Immune Recognition and Response Modulators	Family
C [auth A], D [auth B], G [auth C], H [auth D]	IPR003597	Immunoglobulin C1-set	Domain
C [auth A], D [auth B], G [auth C], H [auth D]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C [auth A], D [auth B], G [auth C], H [auth D]	IPR013106	Immunoglobulin V-set domain	Domain
C [auth A], D [auth B], G [auth C], H [auth D]	IPR003599	Immunoglobulin domain subtype	Domain
C [auth A], D [auth B], G [auth C], H [auth D]	IPR007110	Immunoglobulin-like domain	Domain
C [auth A], D [auth B], G [auth C], H [auth D]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site