Annotations: 4FQK

Influenza B/Brisbane/60/2008 hemagglutinin Fab CR8059 complex

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
IMGT Antibody Annotation
SAbDab Antibody 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)
D	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8088076	3001616	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8088076	3001616	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Influenza hemagglutinin domain-like	8087896	3001342	SCOP2B (2022-06-29)
A	SCOP2 Family	Influenza hemagglutinin headpiece	8087895	4002506	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Influenza hemagglutinin domain-like	8087896	3001342	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)
H [auth L]	RRM_1	e4fqkL2	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: RRM_1	ECOD (v294.2)
F	RRM_1	e4fqkF2	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: RRM_1	ECOD (v294.2)
G [auth H]	Rrf2	e4fqkH1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: Rrf2	ECOD (v294.2)
E	Rrf2	e4fqkE1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: Rrf2	ECOD (v294.2)
C	V-set	e4fqkC1	A: beta barrels	X: beta-Grasp	H: HTH	T: winged helix domain	F: V-set	ECOD (v294.2)
A	DMRL_synthase	e4fqkA1	A: beta barrels	X: Flavodoxin-like	H: SH3	T: SH3	F: DMRL_synthase	ECOD (v294.2)

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, H [auth L]	CR8059 Fab	L-LAMBDA	Homo sapiens (human)	IGLV1-4701, IGLJ201, IGLJ302, IGLJ301, IGLC201, IGLC202, IGLC3*04	V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA	IG	FAB-GAMMA-1_LAMBDA	IMGT (202617-0)
E, G [auth H]	CR8059 Fab	VH-CH1	Homo sapiens (human)	IGHV1-1801, IGHV1-1804, IGHJ401, IGHJ402, IGHJ403, IGHG103	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_LAMBDA	IMGT (202617-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F, H [auth L]	Light Chain	IGLV1	Lambda	hemagglutinin ha1	SAbDab (2026-05-08)
E, G [auth H]	Heavy Chain	IGHV1	-	hemagglutinin ha1	SAbDab (2026-05-08)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
F, H [auth L]	Antibody CR8059 Light Chain	-	-	-
E, G [auth H]	Antibody CR8059 Heavy Chain	-	-	-
B, D	Hemagglutinin HA2	host cell surface binding binding host cell surface receptor binding	viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion fusion of virus membrane with host plasma membrane cellular process cellular component organization or biogenesis 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 viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion fusion of virus membrane with host plasma membrane cellular process cellular component organization or biogenesis 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 endocytosis involved in viral entry into host cell	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
A, C	Hemagglutinin HA1	host cell surface binding binding host cell surface receptor binding	viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion fusion of virus membrane with host plasma membrane cellular process cellular component organization or biogenesis 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 viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion fusion of virus membrane with host plasma membrane cellular process cellular component organization or biogenesis 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 endocytosis involved in viral entry into host cell	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
B, D	IPR001364	Haemagglutinin, influenzavirus A/B	Family
B, D	IPR008980	Viral capsid/haemagglutinin protein	Homologous Superfamily
B, D	IPR000386	Haemagglutinin, influenzavirus B	Family
B, D	IPR013828	Haemagglutinin, HA1 chain, alpha/beta domain superfamily	Homologous Superfamily
A, C	IPR001364	Haemagglutinin, influenzavirus A/B	Family
A, C	IPR008980	Viral capsid/haemagglutinin protein	Homologous Superfamily
A, C	IPR000386	Haemagglutinin, influenzavirus B	Family
A, C	IPR013828	Haemagglutinin, HA1 chain, alpha/beta domain superfamily	Homologous Superfamily

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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.