Annotations: 9NJ2

N1 neuraminidase of influenza A/Vietnam/1203/2004 H5N1 in complex with four FNI9 Fab molecules

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
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	Sialidases	8071678	3001607	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Sialidases	8071678	3001607	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Sialidases	8071678	3001607	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Sialidases	8071678	3001607	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)
E [auth H]	Neur_chan_memb	e9nj2H1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Neur_chan_memb	ECOD (v295.2)
A	Neur_chan_memb	e9nj2A1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Neur_chan_memb	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
I [auth L], J [auth M], K [auth N], L [auth O]	Light Chain	IGKV3	Kappa	neuraminidase	SAbDab (2026-09-11)
E [auth H], F [auth I], G [auth J], H [auth K]	Heavy Chain	IGHV1	-	neuraminidase	SAbDab (2026-09-11)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
I [auth L], J [auth M], K [auth N], L [auth O]	FNI9 Fab light chain	-	-	-
E [auth H], F [auth I], G [auth J], H [auth K]	FNI9 Fab heavy chain	-	-	-
A, B, C, D	Neuraminidase	cation binding ion binding binding metal ion binding small molecule binding identical protein binding protein binding hydrolase activity, acting on glycosyl bonds alpha-sialidase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity exo-alpha-sialidase activity catalytic activity	carbohydrate metabolic process primary metabolic process metabolic process cellular process biological process involved in interspecies interaction between organisms non-lytic viral release viral budding viral life cycle biological process involved in interaction with host biological process involved in symbiotic interaction virion assembly exit from host cell viral process viral budding from plasma membrane carbohydrate metabolic process primary metabolic process metabolic process cellular process biological process involved in interspecies interaction between organisms non-lytic viral release viral budding viral life cycle biological process involved in interaction with host biological process involved in symbiotic interaction virion assembly exit from host cell viral process viral budding from plasma membrane viral release from host cell	cellular anatomical structure membrane host cell plasma membrane host cellular component host cell part host cell membrane other organism part virion component virion membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR001860	Glycoside hydrolase, family 34	Family
A, B, C, D	IPR033654	Sialidase, Influenza viruses A/B	Domain
A, B, C, D	IPR036278	Sialidase 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.