7NKI | pdb_00007nki

1918 H1N1 Viral influenza polymerase heterotrimer with Nb8209 core

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Flu_PA_C	e7nkiA1	A: a+b complex topology	X: Polymerase acidic protein (From Topology)	H: Polymerase acidic protein (From Topology)	T: Polymerase acidic protein	F: Flu_PA_C	ECOD (1.6)
A	Flu_PA_N	e7nkiA2	A: a/b three-layered sandwiches	X: Restriction endonuclease-like	H: Restriction endonuclease-like (From Topology)	T: Restriction endonuclease-like	F: Flu_PA_N	ECOD (1.6)
B	Flu_PB1_2nd	e7nkiB2	A: alpha bundles	X: helical bundle domain in reverse transcriptase-like polymerases (From Topology)	H: helical bundle domain in reverse transcriptase-like polymerases (From Topology)	T: helical bundle domain in reverse transcriptase-like polymerases	F: Flu_PB1_2nd	ECOD (1.6)
B	Flu_PB1_1st	e7nkiB1	A: a+b two layers	X: Alpha-beta plaits	H: Adenylyl and guanylyl cyclase catalytic domain-like	T: Adenylyl and guanylyl cyclase catalytic domain-like	F: Flu_PB1_1st	ECOD (1.6)
B	Flu_PB1_3rd	e7nkiB3	A: extended segments	X: RNA polymerase PB1 C-terminal fragment (From Topology)	H: RNA polymerase PB1 C-terminal fragment (From Topology)	T: RNA polymerase PB1 C-terminal fragment	F: Flu_PB1_3rd	ECOD (1.6)
C	Flu_PB2_2nd	e7nkiC1	A: a+b two layers	X: a+b domain in PB2 (From Topology)	H: a+b domain in PB2 (From Topology)	T: a+b domain in PB2	F: Flu_PB2_2nd	ECOD (1.6)
C	Flu_PB2_3rd	e7nkiC2	A: a+b complex topology	X: Middle domain in PB2 (From Topology)	H: Middle domain in PB2 (From Topology)	T: Middle domain in PB2	F: Flu_PB2_3rd	ECOD (1.6)
C	Flu_PB2_1st	e7nkiC3	A: extended segments	X: RNA polymerase PB2 N-terminal fragment (From Topology)	H: RNA polymerase PB2 N-terminal fragment (From Topology)	T: RNA polymerase PB2 N-terminal fragment	F: Flu_PB2_1st	ECOD (1.6)
F	V-set_8	e7nkiF1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F	Heavy Chain	IGHV1	-	polymerase acidic protein	SAbDab (2026-01-23)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Polymerase acidic protein	hydrolase activity catalytic activity endonuclease activity nuclease activity catalytic activity, acting on a nucleic acid RNA binding binding nucleic acid binding cation binding ion binding metal ion binding small molecule binding	symbiont-mediated suppression of host transcription symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity symbiont-mediated perturbation of host process symbiont-mediated perturbation of host gene expression symbiont-mediated perturbation of host transcription modulation of process of another organism biological process involved in interaction with host biological process involved in symbiotic interaction RNA metabolic process viral life cycle primary metabolic process nucleobase-containing compound biosynthetic process symbiont-mediated suppression of host transcription symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity symbiont-mediated perturbation of host process symbiont-mediated perturbation of host gene expression symbiont-mediated perturbation of host transcription modulation of process of another organism biological process involved in interaction with host biological process involved in symbiotic interaction RNA metabolic process viral life cycle primary metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process RNA biosynthetic process nucleobase-containing compound metabolic process nucleic acid biosynthetic process viral genome replication biosynthetic process viral RNA genome replication viral process metabolic process cellular process macromolecule metabolic process viral gene expression cap snatching negative stranded viral RNA transcription viral transcription RNA-templated viral transcription symbiont-mediated suppression of host gene expression viral translational frameshifting viral translation gene expression DNA-templated transcription	host intracellular membrane-bounded organelle host cellular component host intracellular part cellular anatomical structure host cell part host intracellular region host cell nucleus other organism part host intracellular organelle host cell cytoplasm
B	RNA-directed RNA polymerase catalytic subunit	RNA-directed RNA polymerase activity 5'-3' RNA polymerase activity catalytic activity, acting on RNA catalytic activity, acting on a nucleic acid RNA polymerase activity transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups RNA binding binding nucleic acid binding nucleoside phosphate binding nucleotide binding RNA-directed RNA polymerase activity 5'-3' RNA polymerase activity catalytic activity, acting on RNA catalytic activity, acting on a nucleic acid RNA polymerase activity transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups RNA binding binding nucleic acid binding nucleoside phosphate binding nucleotide binding heterocyclic compound binding small molecule binding	symbiont-mediated suppression of host transcription symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity symbiont-mediated perturbation of host process symbiont-mediated perturbation of host gene expression symbiont-mediated perturbation of host transcription modulation of process of another organism biological process involved in interaction with host biological process involved in symbiotic interaction RNA metabolic process viral life cycle primary metabolic process nucleobase-containing compound biosynthetic process symbiont-mediated suppression of host transcription symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity symbiont-mediated perturbation of host process symbiont-mediated perturbation of host gene expression symbiont-mediated perturbation of host transcription modulation of process of another organism biological process involved in interaction with host biological process involved in symbiotic interaction RNA metabolic process viral life cycle primary metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process RNA biosynthetic process nucleobase-containing compound metabolic process nucleic acid biosynthetic process viral genome replication biosynthetic process viral RNA genome replication viral process metabolic process cellular process macromolecule metabolic process viral gene expression viral transcription symbiont-mediated suppression of host gene expression gene expression DNA-templated transcription	host intracellular membrane-bounded organelle host cellular component host intracellular part cellular anatomical structure host cell part host intracellular region host cell nucleus other organism part host intracellular organelle host cell cytoplasm
C	Polymerase basic protein 2,Polymerase basic protein 2	RNA-directed RNA polymerase activity 5'-3' RNA polymerase activity catalytic activity, acting on RNA catalytic activity, acting on a nucleic acid RNA polymerase activity transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups RNA binding binding nucleic acid binding	symbiont-mediated suppression of host transcription symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity symbiont-mediated perturbation of host process symbiont-mediated perturbation of host gene expression symbiont-mediated perturbation of host transcription modulation of process of another organism biological process involved in interaction with host biological process involved in symbiotic interaction symbiont-mediated perturbation of host defense response symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity symbiont-mediated suppression of host pathogen-associated molecular pattern receptor signaling pathway symbiont-mediated perturbation of host immune response symbiont-mediated suppression of host transcription symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity symbiont-mediated perturbation of host process symbiont-mediated perturbation of host gene expression symbiont-mediated perturbation of host transcription modulation of process of another organism biological process involved in interaction with host biological process involved in symbiotic interaction symbiont-mediated perturbation of host defense response symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity symbiont-mediated suppression of host pathogen-associated molecular pattern receptor signaling pathway symbiont-mediated perturbation of host immune response symbiont-mediated suppression of host signal transduction pathway symbiont-mediated suppression of host immune response symbiont-mediated suppression of host innate immune response symbiont-mediated perturbation of host innate immune response symbiont-mediated perturbation of host signal transduction pathway symbiont-mediated suppression of cytoplasmic pattern recognition receptor signaling pathway RNA metabolic process viral life cycle primary metabolic process nucleobase-containing compound biosynthetic process macromolecule biosynthetic process nucleic acid metabolic process RNA biosynthetic process nucleobase-containing compound metabolic process nucleic acid biosynthetic process viral genome replication biosynthetic process viral RNA genome replication viral process metabolic process cellular process macromolecule metabolic process viral gene expression cap snatching negative stranded viral RNA transcription viral transcription RNA-templated viral transcription symbiont-mediated suppression of host gene expression 7-methylguanosine mRNA capping 7-methylguanosine RNA capping RNA capping gene expression mRNA processing mRNA metabolic process RNA 5'-end processing RNA processing DNA-templated transcription	host intracellular membrane-bounded organelle host cellular component host intracellular part other organism part host cell mitochondrion host cell cytoplasm part host intracellular organelle cellular anatomical structure host cell cytoplasm host cell part host intracellular region host cell nucleus virion component
D [auth E]	RNA (5'-R(PGPGPCPCPUPGPCPU)-3')	-	-	-
E [auth D]	RNA (5'-R(PAPGPUPAPGPAPAPAPCPAPAPGPGPCP*C)-3')	-	-	-
F	Nb8209	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR001009	Influenza RNA-dependent RNA polymerase subunit PA	Family
A	IPR037534	Polymerase acidic protein	Family
A	IPR038372	Influenza RNA-dependent RNA polymerase subunit PA, endonuclease domain	Homologous Superfamily
B	IPR007099	RNA-directed RNA polymerase, negative-strand RNA virus	Domain
B	IPR001407	Influenza RNA-dependent RNA polymerase subunit PB1	Family
C	IPR001591	Influenza RNA-dependent RNA polymerase subunit PB2	Family
C	IPR049106	Influenza RNA polymerase PB2, N-terminal region	Domain
C	IPR049115	Influenza RNA polymerase PB2, C-terminal domain	Domain
C	IPR049110	Influenza RNA polymerase PB2, second domain	Domain
C	IPR049114	Influenza RNA polymerase PB2, sixth domain	Domain
C	IPR049113	Polymerase basic protein 2, helical domain	Domain
C	IPR049111	Influenza RNA polymerase PB2, middle domain	Domain
C	IPR048298	Influenza RNA polymerase PB2, CAP binding domain	Domain
C	IPR037258	PB2, C-terminal	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.