Annotations: 3LEV

HIV-1 antibody 2F5 in complex with epitope scaffold ES2

External Resource: Annotation

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

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth H]	d3levh1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	Immunoglobulin heavy chain variable domain, VH	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C [auth H]	d3levh2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin heavy chain gamma constant domain 1, CH1-gamma	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B [auth L]	d3levl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	Immunoglobulin light chain kappa variable domain, VL-kappa	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B [auth L]	d3levl2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	Immunoglobulin light chain kappa constant domain, CL-kappa	human (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)
A	SCOP2B Superfamily	Sigma2 domain of RNA polymerase sigma factors	8044411	3001393	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	Flavin containing amine oxidoreductase / NAD(P)-binding Rossmann-like domain	e3levA1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: Flavin containing amine oxidoreductase / NAD(P)-binding Rossmann-like domain	ECOD (v295.2)
C [auth H]	Flavin containing amine oxidoreductase / NAD(P)-binding Rossmann-like domain	e3levH1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: Flavin containing amine oxidoreductase / NAD(P)-binding Rossmann-like domain	ECOD (v295.2)
B [auth L]	Flavin containing amine oxidoreductase / NAD(P)-binding Rossmann-like domain	e3levL1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: Flavin containing amine oxidoreductase / NAD(P)-binding Rossmann-like domain	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.120.1810	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)		CATH (4.3.0)
C [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [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
C [auth H]	2F5 mAb, anti-gp41 membrane-proximal external region (MPER)	VH-CH1	Homo sapiens (human)	IGHV2-502, IGHJ601, IGHJ602, IGHG101, IGHG102, IGHG104	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202636-0)
B [auth L]	2F5 mAb, anti-gp41 membrane-proximal external region (MPER)	L-KAPPA	Homo sapiens (human)	IGKV1D-1301, IGKV1-1302, IGKJ301, IGKJ401, IGKJ402, IGKC01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202636-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth H]	Heavy Chain	IGHV2	-	rna polymerase sigma factor	SAbDab (2026-09-18)
B [auth L]	Light Chain	IGKV1	Kappa	rna polymerase sigma factor	SAbDab (2026-09-18)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	RNA polymerase sigma factor	DNA binding binding nucleic acid binding transcription regulator activity DNA-binding transcription factor activity sigma factor activity	RNA metabolic process primary metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process DNA-templated transcription initiation nucleic acid metabolic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process biosynthetic process metabolic process cellular process RNA metabolic process primary metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process DNA-templated transcription initiation nucleic acid metabolic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process biosynthetic process metabolic process cellular process macromolecule metabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm
C [auth H]	2F5 ANTIBODY HEAVY CHAIN	-	-	-
B [auth L]	2F5 ANTIBODY LIGHT CHAIN	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR007627	RNA polymerase sigma-70 region 2	Domain
A	IPR000943	RNA polymerase sigma-70	Domain
A	IPR013325	RNA polymerase sigma factor, region 2	Homologous Superfamily
A	IPR013324	RNA polymerase sigma factor, region 3/4-like	Homologous Superfamily
A	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A	IPR012760	RNA polymerase sigma factor RpoD, C-terminal	Domain
A	IPR009042	RNA polymerase sigma-70 region 1.2	Domain
A	IPR007630	RNA polymerase sigma-70 region 4	Domain
A	IPR014284	RNA polymerase sigma-70-like domain	Domain
A	IPR007624	RNA polymerase sigma-70 region 3	Domain
A	IPR028630	RNA polymerase sigma factor RpoD	Family
A	IPR050239	Sigma-70 factor family, RNA polymerase initiation factors	Family