7X6L | pdb_00007x6l

Cryo-EM structure of H3 hemagglutinin from A/HongKong/01/1968 in complex with a neutralizing antibody 28-12

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
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)
L [auth F]	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8088048	3001616	SCOP2B (2022-06-29)
H [auth E]	SCOP2 Family	Influenza hemagglutinin (stalk)	8106875	4003840	SCOP2 (2022-06-29)
H [auth E]	SCOP2 Superfamily	Influenza hemagglutinin (stalk)	8106876	3001616	SCOP2 (2022-06-29)
H [auth E]	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8088048	3001616	SCOP2B (2022-06-29)
D [auth B]	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8088048	3001616	SCOP2B (2022-06-29)
K [auth D]	SCOP2B Superfamily	Influenza hemagglutinin domain-like	8094281	3001342	SCOP2B (2022-06-29)
G [auth C]	SCOP2B Superfamily	Influenza hemagglutinin domain-like	8094281	3001342	SCOP2B (2022-06-29)
C [auth A]	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)
I [auth H]	PhnJ	e7x6lH1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
E [auth G]	PhnJ	e7x6lG1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
A [auth I]	PK_C	e7x6lI1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PK_C	ECOD (v294.1)
L [auth F]	PhnJ	e7x6lF1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
H [auth E]	PhnJ	e7x6lE1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
D [auth B]	PK_C	e7x6lB1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PK_C	ECOD (v294.1)
K [auth D]	PhnJ	e7x6lD1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
G [auth C]	PhnJ	e7x6lC1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
C [auth A]	PK_C	e7x6lA1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PK_C	ECOD (v294.1)
J [auth L]	PhnJ	e7x6lL1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
F [auth J]	PhnJ	e7x6lJ1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PhnJ	ECOD (v294.1)
B [auth K]	PK_C	e7x6lK1	A: a/b three-layered sandwiches	X: RNase A-like	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PK_C	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
I [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth G]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A [auth I]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
L [auth F]	3.90.20.10	Alpha Beta	Alpha-Beta Complex	Hemagglutinin Ectodomain	Chain B	CATH (utative)
H [auth E]	3.90.20.10	Alpha Beta	Alpha-Beta Complex	Hemagglutinin Ectodomain	Chain B	CATH (utative)
D [auth B]	3.90.20.10	Alpha Beta	Alpha-Beta Complex	Hemagglutinin Ectodomain	Chain B	CATH (utative)
J [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
F [auth J]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B [auth K]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A [auth I], E [auth G], I [auth H]	Heavy Chain	IGHV3	-	hemagglutinin \| hemagglutinin	SAbDab (2026-04-10)
B [auth K], F [auth J], J [auth L]	Light Chain	IGKV1	Kappa	hemagglutinin \| hemagglutinin	SAbDab (2026-04-10)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth I], E [auth G], I [auth H]	Heavy chain of antibody 12 fab	-	-	-
D [auth B], H [auth E], L [auth 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
C [auth A], G [auth C], K [auth D]	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 [auth K], F [auth J], J [auth L]	The light chain of the antibody 12 fab	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

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