Annotations: 6XDC

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	SARS coronavirus viroporin, transmembrane domain	8093337	3002697	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	SARS coronavirus Orf3/3a, C-terminal domain	8093336	3002696	SCOP2B (2022-06-29)
A	SCOP2 Family	SARS coronavirus Orf3/3a viroporin	8093335	4007803	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	SARS coronavirus viroporin, transmembrane domain	8093337	3002697	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	SARS coronavirus Orf3/3a, C-terminal domain	8093336	3002696	SCOP2 (2022-06-29)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	ORF3a protein	molecular function activator activity molecular function regulator activity passive transmembrane transporter activity monoatomic ion channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity identical protein binding protein binding binding	transmembrane transport localization transport cellular process inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated perturbation of host process symbiont-mediated activation of host autophagy modulation of process of another organism biological process involved in interaction with host induction by virus of host reticulophagy transmembrane transport localization transport cellular process inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport symbiont-mediated perturbation of host cellular process biological process involved in interspecies interaction between organisms symbiont-mediated perturbation of host process symbiont-mediated activation of host autophagy modulation of process of another organism biological process involved in interaction with host induction by virus of host reticulophagy biological process involved in symbiotic interaction	virion component virion membrane cellular anatomical structure extracellular region host intracellular membrane-bounded organelle host cellular component host intracellular part host cell cytoplasm host cell part host cell endoplasmic reticulum host intracellular region host cell cytoplasm part host intracellular organelle host cell lysosome virion component virion membrane cellular anatomical structure extracellular region host intracellular membrane-bounded organelle host cellular component host intracellular part host cell cytoplasm host cell part host cell endoplasmic reticulum host intracellular region host cell cytoplasm part host intracellular organelle host cell lysosome host cell endosome cell periphery plasma membrane membrane host cell membrane host cell endomembrane system host cell endoplasmic reticulum membrane protein-containing complex plasma membrane protein complex voltage-gated calcium channel complex membrane protein complex cation channel complex transporter complex transmembrane transporter complex calcium channel complex monoatomic ion channel complex host cell plasma membrane cytoplasmic side of plasma membrane cytoplasmic side of membrane side of membrane voltage-gated potassium channel complex potassium channel complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR046446	3a-like viroporin, cytosolic domain, alpha/betacoronavirus	Domain
A, B	IPR024407	Protein 3a, betacoronavirus	Family
A, B	IPR046445	3a-like viroporin, transmembrane domain, alpha/betacoronavirus	Domain

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B	OPM	Transmembrane	Alpha-helical polytopic	Polytopic viroporins	Betacoronavirus viroporin 3a

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B	MemProtMD	Annotated as membrane protein by MemProtMD

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.