Annotations: 6O9I

Ternary complex of mouse ECD with Fab1 and Fab2

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Protein Modification Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
E	d6o9ie1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E	d6o9ie2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d6o9id_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d6o9ib1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d6o9ib2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d6o9ia_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2 Family	Hormone receptor domain	8094574	4003045	SCOP2 (2022-06-29)
C	SCOP2 Superfamily	FnI-like domain	8094575	3000979	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
E	Radical_SAM	e6o9iE1	A: alpha arrays	X: jelly-roll	H: Helical bundle in flu nucleocapsid protein	T: Helical bundle in flu nucleocapsid protein	F: Radical_SAM	ECOD (v295)
D	Radical_SAM	e6o9iD1	A: alpha arrays	X: jelly-roll	H: Helical bundle in flu nucleocapsid protein	T: Helical bundle in flu nucleocapsid protein	F: Radical_SAM	ECOD (v295)
C	Radical_SAM	e6o9iC1	A: alpha arrays	X: jelly-roll	H: Helical bundle in flu nucleocapsid protein	T: Helical bundle in flu nucleocapsid protein	F: Radical_SAM	ECOD (v295)
B	Radical_SAM	e6o9iB1	A: alpha arrays	X: jelly-roll	H: Helical bundle in flu nucleocapsid protein	T: Helical bundle in flu nucleocapsid protein	F: Radical_SAM	ECOD (v295)
A	Radical_SAM	e6o9iA1	A: alpha arrays	X: jelly-roll	H: Helical bundle in flu nucleocapsid protein	T: Helical bundle in flu nucleocapsid protein	F: Radical_SAM	ECOD (v295)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E	Light Chain	IGKV1	Kappa	ecd	SAbDab (2026-06-26)
D	Heavy Chain	IGHV1	-	ecd	SAbDab (2026-06-26)
B	Light Chain	IGKV8	Kappa	ecd	SAbDab (2026-06-26)
A	Heavy Chain	IGHV5	-	ecd	SAbDab (2026-06-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C	PF02793	Hormone receptor domain (HRM)	Hormone receptor domain	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E	Fab2 light chain	-	-	-
D	Fab 2 heavy chain	-	-	-
C	Gastric inhibitory polypeptide receptor	molecular transducer activity signaling receptor activity glucagon family peptide binding binding peptide hormone binding hormone binding G protein-coupled receptor activity transmembrane signaling receptor activity gastric inhibitory peptide receptor activity peptide receptor activity G protein-coupled peptide receptor activity	cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation cell communication G protein-coupled receptor signaling pathway cellular process signal transduction neuropeptide signaling pathway response to stress response to wounding response to axon injury cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus signaling biological regulation cell communication G protein-coupled receptor signaling pathway cellular process signal transduction neuropeptide signaling pathway response to stress response to wounding response to axon injury positive regulation of cytosolic calcium ion concentration regulation of biological quality response to metal ion response to chemical response to calcium ion adenylate cyclase-modulating G protein-coupled receptor signaling pathway negative adaptation of signaling pathway negative regulation of signaling negative regulation of biological process desensitization of G protein-coupled receptor signaling pathway regulation of signal transduction negative regulation of G protein-coupled receptor signaling pathway negative regulation of cell communication negative regulation of cellular process regulation of G protein-coupled receptor signaling pathway regulation of signaling negative regulation of response to stimulus negative regulation of signal transduction regulation of response to stimulus adaptation of signaling pathway regulation of cell communication response to hexose response to monosaccharide response to carbohydrate response to glucose response to oxygen-containing compound gastric inhibitory peptide signaling pathway adenylate cyclase-activating G protein-coupled receptor signaling pathway developmental process multicellular organism development multicellular organismal process pancreas development endocrine system development anatomical structure development animal organ development endocrine pancreas development system development cell surface receptor signaling pathway response to lipid response to fatty acid positive regulation of cell communication regulation of localization establishment of protein localization nitrogen compound transport positive regulation of establishment of protein localization localization positive regulation of insulin secretion intracellular protein localization regulation of peptide hormone secretion regulation of hormone levels positive regulation of peptide hormone secretion establishment of protein localization to extracellular region protein secretion establishment of localization regulation of protein secretion regulation of secretion positive regulation of protein localization regulation of hormone secretion regulation of protein localization regulation of peptide secretion transport positive regulation of biological process positive regulation of secretion by cell hormone secretion protein localization to extracellular region positive regulation of protein transport peptide secretion regulation of secretion by cell secretion by cell positive regulation of hormone secretion positive regulation of secretion signal release positive regulation of cellular process positive regulation of peptide secretion regulation of transport secretion regulation of peptide transport regulation of establishment of protein localization export from cell cell-cell signaling regulation of protein transport positive regulation of protein secretion peptide transport positive regulation of transport protein transport regulation of insulin secretion peptide hormone secretion macromolecule localization hormone transport insulin secretion positive regulation of signaling	cell periphery cellular anatomical structure plasma membrane membrane
B	Fab1 light chain	-	-	-
A	Fab1 heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C	IPR017983	GPCR, family 2, secretin-like, conserved site	Conserved Site
C	IPR050332	G-protein coupled receptor 2	Family
C	IPR036445	GPCR family 2, extracellular hormone receptor domain superfamily	Homologous Superfamily
C	IPR000832	GPCR, family 2, secretin-like	Family
C	IPR017981	GPCR, family 2-like, 7TM	Domain
C	IPR001879	GPCR, family 2, extracellular hormone receptor domain	Domain
C	IPR001749	GPCR, family 2, gastric inhibitory polypeptide receptor	Family

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
D	PCA	Parent Component: GLN : AA0031 : 2-pyrrolidone-5-carboxylic acid (Gln) MOD:00040 , 2-pyrrolidone-5-carboxylic acid (Glu) MOD:00420

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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.