Annotations: 4NRX

Crystal Structure of HIV-1 Neutralizing Antibody m66 in complex with gp41 MPER peptide

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 [auth E]	MreC	e4nrxE1	A: beta barrels	X: DEATH domain	H: HTH	T: winged helix domain	F: MreC	ECOD (v294.2)
G [auth B]	MreC	e4nrxB1	A: beta barrels	X: DEATH domain	H: HTH	T: winged helix domain	F: MreC	ECOD (v294.2)
F [auth L]	Acylphosphatase	e4nrxL1	A: beta barrels	X: FAD-linked reductases, C-terminal domain-like	H: FAD-linked reductases-C	T: FAD-linked reductases-C	F: Acylphosphatase	ECOD (v294.2)
E [auth D]	MreC	e4nrxD1	A: beta barrels	X: DEATH domain	H: HTH	T: winged helix domain	F: MreC	ECOD (v294.2)
D [auth A]	MreC	e4nrxA1	A: beta barrels	X: DEATH domain	H: HTH	T: winged helix domain	F: MreC	ECOD (v294.2)
C [auth H]	Glyco_hydro_2	e4nrxH3	A: beta barrels	X: Fusion glycoprotein F2	H: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase	T: MoeA-I/Ornithine decarboxylase-C/Reverse ferredoxin-like domain in RNA-polymerase	F: Glyco_hydro_2	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
H [auth E]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth H]	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
F [auth L], G [auth B], H [auth E]	N-terminal region [HIV-1], neutralizing	L-KAPPA	Homo sapiens (human)	IGKV1-3901, IGKV1D-3901, IGKJ301, IGKC01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202618-0)
C [auth H], D [auth A], E [auth D]	N-terminal region [HIV-1], neutralizing	VH-CH1	Homo sapiens (human)	IGHV5-5101, IGHV5-5103, IGHJ601, IGHJ602, IGHG101, IGHG102, IGHG1*04	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202618-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F [auth L], G [auth B], H [auth E]	Light Chain	IGKV1	Kappa	envelope glycoprotein gp41	SAbDab (2026-05-15)
C [auth H], D [auth A], E [auth D]	Heavy Chain	IGHV5	-	envelope glycoprotein gp41	SAbDab (2026-05-15)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
F [auth L], G [auth B], H [auth E]	m66 Light Chain	-	-	-
C [auth H], D [auth A], E [auth D]	m66 Heavy Chain	-	-	-
A [auth P], B [auth C]	Envelope glycoprotein gp41	structural molecule activity	viral process membrane fusion involved in viral entry into host cell virion attachment to host cell biological process involved in interspecies interaction between organisms adhesion of symbiont to host cell viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction symbiont entry into host cell symbiont entry into host	virion component viral membrane viral envelope host cell plasma membrane host cellular component cellular anatomical structure host cell part host cell membrane other organism part virion membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth P], B [auth C]	IPR000328	Retroviral envelope protein GP41-like	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.