Annotations: 2OTU

Crystal structure of Fv polyglutamine complex

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
H	Biopterin_H	e2otuH1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)
F	Biopterin_H	e2otuF1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)
D	Biopterin_H	e2otuD1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)
B	Biopterin_H	e2otuB1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)
G	Biopterin_H	e2otuG1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)
E	Biopterin_H	e2otuE1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)
C	Biopterin_H	e2otuC1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)
A	Biopterin_H	e2otuA1	A: alpha arrays	X: HTH	H: Nudix	T: Nudix	F: Biopterin_H	ECOD (v295)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
H	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	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
B, D, F, H	Fv anti-polyglutamine (polyQ)	VH	Mus musculus (house mouse)	IGHV5-1201, IGHJ301	V-DOMAIN VH	IG	FV-HEAVY_LAMBDA	IMGT (202625-0)
A, C, E, G	Fv anti-polyglutamine (polyQ)	V-LAMBDA	Mus musculus (house mouse)	IGLV301, IGLJ201	V-DOMAIN V-LAMBDA	IG	FV-HEAVY_LAMBDA	IMGT (202625-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, D, F, H	Heavy Chain	IGHV5	-	peptide antigen	SAbDab (2026-06-26)
A, C, E, G	Light Chain	IGLV3	Lambda	peptide antigen	SAbDab (2026-06-26)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
I [auth P], J [auth Q], K [auth R], L [auth S]	peptide antigen	-	-	-
B, D, F, H	Fv heavy chain variable domain	-	response to stimulus immune response immune system process adaptive immune response	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex immunoglobulin complex extracellular region
A, C, E, G	Fv light chain variable domain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B, D, F, H	IPR050199	Immunoglobulin Heavy Variable	Family
B, D, F, H	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B, D, F, H	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
B, D, F, H	IPR013106	Immunoglobulin V-set domain	Domain
B, D, F, H	IPR003599	Immunoglobulin domain subtype	Domain
B, D, F, H	IPR007110	Immunoglobulin-like domain	Domain

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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.