Annotations: 8D1N

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth E]		e8d1nE1	A: Family A G protein-coupled receptor-like	X: Family A G protein-coupled receptor-like	H: Family A G protein-coupled receptor-like	T: Peptidase_S29	F:	ECOD (20:10:01)
B [auth D]		e8d1nD1	A: Family A G protein-coupled receptor-like	X: Family A G protein-coupled receptor-like	H: Family A G protein-coupled receptor-like	T: Peptidase_S29	F:	ECOD (20:10:01)
C [auth A]		e8d1nA1	A: Family A G protein-coupled receptor-like	X: Family A G protein-coupled receptor-like	H: Family A G protein-coupled receptor-like	T: Peptidase_S29	F:	ECOD (20:10:01)
D [auth C]		e8d1nC1	A: Family A G protein-coupled receptor-like	X: Family A G protein-coupled receptor-like	H: Family A G protein-coupled receptor-like	T: Peptidase_S29	F:	ECOD (20:10:01)
E [auth B]		e8d1nB1	A: Family A G protein-coupled receptor-like	X: Family A G protein-coupled receptor-like	H: Family A G protein-coupled receptor-like	T: Peptidase_S29	F:	ECOD (20:10:01)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth E], B [auth D], C [auth A], D [auth C], E [auth B]	Bestrophin	bicarbonate transmembrane transporter activity passive transmembrane transporter activity bicarbonate channel activity channel activity transporter activity transmembrane transporter activity ligand-gated channel activity intracellularly ligand-gated monoatomic ion channel activity ligand-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity monoatomic ion transmembrane transporter activity monoatomic anion transmembrane transporter activity ligand-gated monoatomic anion channel activity bicarbonate transmembrane transporter activity passive transmembrane transporter activity bicarbonate channel activity channel activity transporter activity transmembrane transporter activity ligand-gated channel activity intracellularly ligand-gated monoatomic ion channel activity ligand-gated monoatomic ion channel activity gated channel activity monoatomic ion channel activity monoatomic ion transmembrane transporter activity monoatomic anion transmembrane transporter activity ligand-gated monoatomic anion channel activity monoatomic anion channel activity chloride transmembrane transporter activity chloride channel activity monoatomic cation transmembrane transporter activity monoatomic cation channel activity ligand-gated monoatomic cation channel activity	localization bicarbonate transport organic anion transport transport establishment of localization monoatomic ion transmembrane transport chloride transport transmembrane transport chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport cellular process inorganic anion transport	protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex cell periphery plasma membrane basal part of cell basal plasma membrane plasma membrane region basolateral plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth E], B [auth D], C [auth A], D [auth C], E [auth B]	IPR021134	Bestrophin-like	Family
A [auth E], B [auth D], C [auth A], D [auth C], E [auth B]	IPR000615	Bestrophin	Family

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A [auth E], B [auth D], C [auth A], D [auth C], E [auth B]	OPM	Transmembrane	Alpha-helical polytopic	Bestrophin anion channel	Bestrophin anion channel

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A [auth E], B [auth D], C [auth A], D [auth C], E [auth B]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A [auth E], B [auth D], C [auth A], D [auth C], E [auth B]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Other Ion Channels	Bestrophin-2 (BEST2) Ca²⁺-activated Cl^- channel, 1uM Ca²⁺, closed state

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.