5K9K | pdb_00005k9k

Crystal structure of multidonor HV6-1-class broadly neutralizing Influenza A antibody 56.a.09 in complex with Hemagglutinin Hong Kong 1968.

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)
F	d5k9kf1	All beta proteins	Viral protein domain	Viral protein domain	Influenza hemagglutinin headpiece	Hemagglutinin	(Influenza A virus (A/Hong Kong/1/1968(H3N2)) ) [TaxId: 506350 ],	SCOPe (2.08)
F	d5k9kf2	Coiled coil proteins	Stalk segment of viral fusion proteins	Influenza hemagglutinin (stalk)	automated matches	automated matches	(Influenza A virus (A/Hong Kong/1/1968(H3N2)) ) [TaxId: 506350 ],	SCOPe (2.08)
C [auth I]	d5k9ki1	All beta proteins	Viral protein domain	Viral protein domain	Influenza hemagglutinin headpiece	Hemagglutinin	(Influenza A virus (A/Hong Kong/1/1968(H3N2)) ) [TaxId: 506350 ],	SCOPe (2.08)
C [auth I]	d5k9ki2	Coiled coil proteins	Stalk segment of viral fusion proteins	Influenza hemagglutinin (stalk)	automated matches	automated matches	(Influenza A virus (A/Hong Kong/1/1968(H3N2)) ) [TaxId: 506350 ],	SCOPe (2.08)
E [auth L]	d5k9kl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E [auth L]	d5k9kl2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d5k9kb1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d5k9kb2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D [auth H]	d5k9kh1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D [auth H]	d5k9kh2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d5k9ka1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d5k9ka2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(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)
F	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8088048	3001616	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Influenza hemagglutinin domain-like	8094281	3001342	SCOP2B (2022-06-29)
C [auth I]	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8088048	3001616	SCOP2B (2022-06-29)
C [auth I]	SCOP2B Superfamily	Influenza hemagglutinin domain-like	8094281	3001342	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	SasG_E	e5k9kF1	A: alpha bundles	X: Tetrapyrrole methylase C-terminal domain-like	H: Tetrapyrrole methylase C-terminal domain	T: Tetrapyrrole methylase C-terminal domain	F: SasG_E	ECOD (develop294)
C [auth I]	SasG_E	e5k9kI1	A: alpha bundles	X: Tetrapyrrole methylase C-terminal domain-like	H: Tetrapyrrole methylase C-terminal domain	T: Tetrapyrrole methylase C-terminal domain	F: SasG_E	ECOD (develop294)
E [auth L]	SasG_E	e5k9kL1	A: alpha bundles	X: Tetrapyrrole methylase C-terminal domain-like	H: Tetrapyrrole methylase C-terminal domain	T: Tetrapyrrole methylase C-terminal domain	F: SasG_E	ECOD (develop294)
B	SasG_E	e5k9kB1	A: alpha bundles	X: Tetrapyrrole methylase C-terminal domain-like	H: Tetrapyrrole methylase C-terminal domain	T: Tetrapyrrole methylase C-terminal domain	F: SasG_E	ECOD (develop294)
D [auth H]	SasG_E	e5k9kH1	A: alpha bundles	X: Tetrapyrrole methylase C-terminal domain-like	H: Tetrapyrrole methylase C-terminal domain	T: Tetrapyrrole methylase C-terminal domain	F: SasG_E	ECOD (develop294)
A	SasG_E	e5k9kA1	A: alpha bundles	X: Tetrapyrrole methylase C-terminal domain-like	H: Tetrapyrrole methylase C-terminal domain	T: Tetrapyrrole methylase C-terminal domain	F: SasG_E	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F	3.90.209.20	Alpha Beta	Alpha-Beta Complex	Hemagglutinin (Ha1 Chain)	Chain: A	CATH (4.3.0)
C [auth I]	3.90.209.20	Alpha Beta	Alpha-Beta Complex	Hemagglutinin (Ha1 Chain)	Chain: A	CATH (4.3.0)
E [auth L]	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)
D [auth H]	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, E [auth L]	Fab 56.A.09	L-KAPPA	Homo sapiens (human)	IGKV3-2001, IGKJ201, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)
A, D [auth H]	Fab 56.A.09	VH-CH1	Homo sapiens (human)	IGHV6-101, IGHV6-102, IGHJ201, IGHJ302, IGHG101, IGHG102, IGHG104, IGHG105, IGHG112, IGHG114, IGHG113, IGHG109, IGHG110, IGHG107, IGHG1*11	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202610-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, E [auth L]	Light Chain	IGKV3	Kappa	hemagglutinin	SAbDab (2026-03-20)
A, D [auth H]	Heavy Chain	IGHV6	-	hemagglutinin	SAbDab (2026-03-20)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth I], F	Hemagglutinin	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 non-lytic viral release viral budding virion assembly exit from host cell viral budding from plasma membrane viral release from host cell import into cell receptor-mediated endocytosis of virus by host cell transport establishment of localization vesicle-mediated transport localization symbiont entry into host cell clathrin-dependent endocytosis symbiont entry into host clathrin-dependent endocytosis of virus by host cell receptor-mediated endocytosis endocytosis endocytosis involved in viral entry into host cell	cellular anatomical structure membrane virion component virion membrane viral membrane viral envelope host cell plasma membrane host cellular component host cell part host cell membrane other organism part
B, E [auth L]	56.a.09 Light chain	-	-	-
A, D [auth H]	56.a.09 Heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth I], F	IPR001364	Haemagglutinin, influenzavirus A/B	Family
C [auth I], F	IPR008980	Viral capsid/haemagglutinin protein	Homologous Superfamily
C [auth I], F	IPR000149	Haemagglutinin, influenzavirus A	Family
C [auth I], F	IPR013828	Haemagglutinin, HA1 chain, alpha/beta domain superfamily	Homologous Superfamily

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.