5A3I | pdb_00005a3i

Crystal Structure of a Complex formed between FLD194 Fab and Transmissible Mutant H5 Haemagglutinin

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	d5a3if_	Coiled coil proteins	Stalk segment of viral fusion proteins	Influenza hemagglutinin (stalk)	Influenza hemagglutinin (stalk)	automated matches	INFLUENZA VIRUS (Influenza A virus (A/Viet Nam/1203/2004(H5N1)) ) [TaxId: 284218 ],	SCOPe (2.08)
H	d5a3ih2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
H	d5a3ih1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d5a3id2	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	d5a3id1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
G	d5a3ig_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C	d5a3ic_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d5a3ib_	Coiled coil proteins	Stalk segment of viral fusion proteins	Influenza hemagglutinin (stalk)	Influenza hemagglutinin (stalk)	automated matches	INFLUENZA VIRUS (Influenza A virus (A/Viet Nam/1203/2004(H5N1)) ) [TaxId: 284218 ],	SCOPe (2.08)
E	d5a3ie1	All beta proteins	Viral protein domain	Viral protein domain	Influenza hemagglutinin headpiece	automated matches	INFLUENZA VIRUS (Influenza A virus (A/Viet Nam/1203/2004(H5N1)) ) [TaxId: 284218 ],	SCOPe (2.08)
E	d5a3ie2	Artifacts	Tags	Tags	Tags	N-terminal Tags	INFLUENZA VIRUS (Influenza A virus (A/Viet Nam/1203/2004(H5N1)) ) [TaxId: 284218 ],	SCOPe (2.08)
A	d5a3ia1	All beta proteins	Viral protein domain	Viral protein domain	Influenza hemagglutinin headpiece	automated matches	INFLUENZA VIRUS (Influenza A virus (A/Viet Nam/1203/2004(H5N1)) ) [TaxId: 284218 ],	SCOPe (2.08)
A	d5a3ia2	Artifacts	Tags	Tags	Tags	N-terminal Tags	INFLUENZA VIRUS (Influenza A virus (A/Viet Nam/1203/2004(H5N1)) ) [TaxId: 284218 ],	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)	8087912	3001616	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Influenza hemagglutinin (stalk)	8087912	3001616	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		e5a3iF1	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)
H		e5a3iH1	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)
D		e5a3iD1	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)
G		e5a3iG2	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)
G		e5a3iG3	A: Lipocalins/Streptavidin	X: SAM/DNA-glycosylase	H: SAM domain-like	T: EF-hand_1, EF-hand_6, EF-hand_7	F:	ECOD (20:10:01)
C		e5a3iC1	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)
C		e5a3iC2	A: Lipocalins/Streptavidin	X: SAM/DNA-glycosylase	H: SAM domain-like	T: EF-hand_1, EF-hand_6, EF-hand_7	F:	ECOD (20:10:01)
B		e5a3iB1	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)
E		e5a3iE1	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)
A		e5a3iA1	A: amino-terminal domain of OmpATb	X: amino-terminal domain of OmpATb	H: SGNH hydrolase	T: Anillin	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F	3.90.20.10	Alpha Beta	Alpha-Beta Complex	Hemagglutinin Ectodomain	Chain B	CATH (4.3.0)
H	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	3.90.20.10	Alpha Beta	Alpha-Beta Complex	Hemagglutinin Ectodomain	Chain B	CATH (4.3.0)
E	2.10.77.10	Mainly Beta	Ribbon	Hemagglutinin	Chain A, domain 2	CATH (4.3.0)
E	3.90.209.20	Alpha Beta	Alpha-Beta Complex	Hemagglutinin (Ha1 Chain)	Chain: A	CATH (4.3.0)
A	2.10.77.10	Mainly Beta	Ribbon	Hemagglutinin	Chain A, domain 2	CATH (4.3.0)
A	3.90.209.20	Alpha Beta	Alpha-Beta Complex	Hemagglutinin (Ha1 Chain)	Chain: A	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
D, H	FLD194 Fab	L-KAPPA	Homo sapiens (human)	IGKV2-2801, IGKV2D-2801, IGKJ401, IGKJ402, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)
C, G	FLD194 Fab	VH-CH1	Homo sapiens (human)	IGHV5-5101, IGHV5-5103, IGHJ401, IGHJ402, IGHJ403, IGHG103	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202609-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D, H	Light Chain	IGKV2	Kappa	hemagglutinin	SAbDab (2026-03-13)
C, G	Heavy Chain	IGHV5	-	hemagglutinin	SAbDab (2026-03-13)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
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
D, H	ANTI-HAEMAGGLUTININ HA1 FAB LIGHT CHAIN	-	-	-
C, G	ANTI-HAEMAGGLUTININ HA1 FAB HEAVY CHAIN	-	-	-
B	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
A, E	HEMAGGLUTININ	identical protein binding protein binding binding host cell surface 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 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	virion component virion membrane viral membrane viral envelope host cell plasma membrane host cellular component cellular anatomical structure host cell part host cell membrane other organism part

InterPro: Protein Family Classification InterPro Database Homepage

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