2FR4 | pdb_00002fr4

Structure of Fab DNA-1 complexed with a stem-loop DNA ligand

External Resource: Annotation

Domain Annotation: SCOP2 Classification
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

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
E [auth A]	SCOP2B Superfamily	Immunoglobulin (Ig) domain-like	8091539	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)
F [auth B]		e2fr4B1	A: HTH	X: HTH	H: tetra-helical, lambda repressor-like	T: ACR_tran	F:	ECOD (20:10:01)
D [auth H]		e2fr4H1	A: HTH	X: HTH	H: tetra-helical, lambda repressor-like	T: ACR_tran	F:	ECOD (20:10:01)
E [auth A]		e2fr4A1	A: HTH	X: HTH	H: tetra-helical, lambda repressor-like	T: ACR_tran	F:	ECOD (20:10:01)
C [auth L]		e2fr4L1	A: HTH	X: HTH	H: tetra-helical, lambda repressor-like	T: ACR_tran	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth L]	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
D [auth H], F [auth B]	DNA-1 Fab, anti-ssDNA / DNA hairpin 5'-d [CTG(CCTT)CAG]-3'	VH-CH1	Mus musculus (house mouse)	IGHV1-1401, IGHJ401, IGHG1*02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)
C [auth L], E [auth A]	DNA-1 Fab, anti-ssDNA / DNA hairpin 5'-d [CTG(CCTT)CAG]-3'	L-KAPPA	Mus musculus (house mouse)	IGKV12-4401, IGKJ501, IGKC01, IGKC02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D [auth H], F [auth B]	Heavy Chain	IGHV1	-	5'-d(cptpgpcpcptptpcpapg)-3'	SAbDab (2026-03-13)
C [auth L], E [auth A]	Light Chain	IGKV12	Kappa	5'-d(cptpgpcpcptptpcpapg)-3'	SAbDab (2026-03-13)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C [auth L], E [auth A]	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
D [auth H], F [auth B]	antibody heavy chain FAB	-	-	-
C [auth L], E [auth A]	antibody light chain FAB	-	developmental process multicellular organismal process cellular developmental process hemopoiesis B cell activation cell activation cell development mononuclear cell differentiation lymphocyte differentiation lymphocyte activation leukocyte activation B cell differentiation cell differentiation immune system process anatomical structure development developmental process multicellular organismal process cellular developmental process hemopoiesis B cell activation cell activation cell development mononuclear cell differentiation lymphocyte differentiation lymphocyte activation leukocyte activation B cell differentiation cell differentiation immune system process anatomical structure development cellular process leukocyte differentiation response to stimulus immune response adaptive immune response	cell periphery cellular anatomical structure plasma membrane membrane protein-containing complex plasma membrane protein complex membrane protein complex alpha-beta T cell receptor complex receptor complex plasma membrane signaling receptor complex T cell receptor complex extracellular region IgG immunoglobulin complex immunoglobulin complex
A [auth M], B [auth N]	5'-D(CPTPGPCPCPTPTPCPAPG)-3'	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

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

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.