Annotations: 8D1F

hBest2 5mM Ca2+ (Ca2+-bound) closed state

External Resource: Annotation

Domain Annotation: ECOD Classification
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: mpstruc

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
E [auth B]	PHF5	e8d1fB1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PHF5	ECOD (v294.2)
D	PHF5	e8d1fD1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PHF5	ECOD (v294.2)
C [auth A]	PHF5	e8d1fA1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PHF5	ECOD (v294.2)
B [auth E]	PHF5	e8d1fE1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PHF5	ECOD (v294.2)
A [auth C]	PHF5	e8d1fC1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PHF5	ECOD (v294.2)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth C], B [auth E], C [auth A], D, E [auth B]	Bestrophin-2	bicarbonate transmembrane transporter activity passive transmembrane transporter activity bicarbonate channel activity channel activity transporter activity transmembrane transporter activity monoatomic anion transmembrane transporter activity gated channel activity monoatomic ion channel activity ligand-gated monoatomic anion channel activity ligand-gated channel activity ligand-gated monoatomic ion channel activity monoatomic ion transmembrane transporter activity monoatomic anion channel activity bicarbonate transmembrane transporter activity passive transmembrane transporter activity bicarbonate channel activity channel activity transporter activity transmembrane transporter activity monoatomic anion transmembrane transporter activity gated channel activity monoatomic ion channel activity ligand-gated monoatomic anion channel activity ligand-gated channel activity ligand-gated monoatomic ion channel activity monoatomic ion transmembrane transporter 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 intracellularly ligand-gated monoatomic ion channel activity cation binding ion binding binding metal ion binding small molecule binding	transport monoatomic ion transmembrane transport establishment of localization chloride transport transmembrane transport localization chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport cellular process inorganic anion transport multicellular organismal process system process transport monoatomic ion transmembrane transport establishment of localization chloride transport transmembrane transport localization chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport cellular process inorganic anion transport multicellular organismal process system process sensory perception of chemical stimulus sensory perception nervous system process sensory perception of smell membrane depolarization biological regulation regulation of biological quality regulation of membrane potential	protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex membrane-bounded organelle cell projection organelle cilium plasma membrane bounded cell projection cell periphery protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex membrane-bounded organelle cell projection organelle cilium plasma membrane bounded cell projection 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 C], B [auth E], C [auth A], D, E [auth B]	IPR000615	Bestrophin	Family
A [auth C], B [auth E], C [auth A], D, E [auth B]	IPR021134	Bestrophin-like	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A [auth C], B [auth E], C [auth A], D, E [auth B]	: Q8NFU1	chromosome 19p13.13 deletion syndrome psoriasis cystic fibrosis ulcerative colitis large cell medulloblastoma vitelliform macular dystrophy

Membrane Protein Annotation: OPM OPM Database Homepage

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

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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.