Annotations: 8D1L

hBest1 Ca2+-bound partially open aperture 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	Peptidase_S29	e8d1lE1	A: alpha arrays	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Peptidase_S29	ECOD (v295)
D	Peptidase_S29	e8d1lD1	A: alpha arrays	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Peptidase_S29	ECOD (v295)
C [auth A]	Peptidase_S29	e8d1lA1	A: alpha arrays	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Peptidase_S29	ECOD (v295)
B [auth C]	Peptidase_S29	e8d1lC1	A: alpha arrays	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Peptidase_S29	ECOD (v295)
A [auth B]	Peptidase_S29	e8d1lB1	A: alpha arrays	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Peptidase_S29	ECOD (v295)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B], B [auth C], C [auth A], D, E	Bestrophin-1	bicarbonate transmembrane transporter activity transporter activity transmembrane transporter activity passive transmembrane transporter activity bicarbonate channel activity channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity monoatomic ion channel activity monoatomic anion channel activity monoatomic ion transmembrane transporter activity chloride channel activity ligand-gated channel activity gated channel activity bicarbonate transmembrane transporter activity transporter activity transmembrane transporter activity passive transmembrane transporter activity bicarbonate channel activity channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity monoatomic ion channel activity monoatomic anion channel activity monoatomic ion transmembrane transporter activity chloride channel activity ligand-gated channel activity gated channel activity identical protein binding protein binding binding intracellularly calcium-gated channel activity intracellularly calcium-gated chloride channel activity ligand-gated monoatomic anion channel activity ligand-gated monoatomic ion channel activity	cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein complex oligomerization protein-containing complex assembly cellular process cellular component organization or biogenesis nitrogen compound transport carboxylic acid transport transport secretion export from cell establishment of localization cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein complex oligomerization protein-containing complex assembly cellular process cellular component organization or biogenesis nitrogen compound transport carboxylic acid transport transport secretion export from cell establishment of localization organic acid transport amino acid transport localization acidic amino acid transport secretion by cell dicarboxylic acid transport glutamate secretion monoatomic ion transmembrane transport chloride transport transmembrane transport chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport inorganic anion transport cellular localization signaling cell communication synaptic signaling gamma-aminobutyric acid transport signal release establishment of localization in cell trans-synaptic signaling regulation of biological process synaptic transmission, GABAergic gamma-aminobutyric acid secretion neurotransmitter secretion biological regulation cell-cell signaling acid secretion neurotransmitter transport chemical synaptic transmission signal release from synapse gamma-aminobutyric acid secretion, neurotransmission anterograde trans-synaptic signaling transepithelial chloride transport transepithelial transport regulation of synaptic plasticity regulation of signaling regulation of cellular process modulation of chemical synaptic transmission regulation of trans-synaptic signaling regulation of cell communication regulation of biological quality multicellular organismal process sensory perception of light stimulus system process sensory perception nervous system process visual perception	protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex membrane microdomain cell periphery basal part of cell plasma membrane basal plasma membrane plasma membrane region protein-containing complex cellular anatomical structure transmembrane transporter complex membrane chloride channel complex membrane protein complex transporter complex monoatomic ion channel complex membrane microdomain cell periphery basal part of cell plasma membrane basal plasma membrane plasma membrane region intracellular anatomical structure cytoplasm cytosol basolateral plasma membrane presynapse synapse cell junction

InterPro: Protein Family Classification InterPro Database Homepage

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

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A [auth B], B [auth C], C [auth A], D, E	: O76090	vitelliform macular dystrophy autosomal recessive bestrophinopathy retinitis pigmentosa autosomal dominant vitreoretinochoroidopathy retinitis pigmentosa 50 retinal degeneration vitelliform macular dystrophy 2 ovarian cancer VITREORETINOCHOROIDOPATHY (disorder) asthma cataract inherited retinal dystrophy macular degeneration adult-onset foveomacular vitelliform dystrophy atypical teratoid rhabdoid tumor vitelliform macular dystrophy autosomal recessive bestrophinopathy retinitis pigmentosa autosomal dominant vitreoretinochoroidopathy retinitis pigmentosa 50 retinal degeneration vitelliform macular dystrophy 2 ovarian cancer VITREORETINOCHOROIDOPATHY (disorder) asthma cataract inherited retinal dystrophy macular degeneration adult-onset foveomacular vitelliform dystrophy atypical teratoid rhabdoid tumor benign concentric annular macular dystrophy colorectal cancer malignant mesothelioma osteosarcoma tuberculosis vitelliform macular dystrophy 3 age-related macular degeneration cone-rod dystrophy lung cancer medulloblastoma

Membrane Protein Annotation: OPM OPM Database Homepage

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

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A [auth B], B [auth C], C [auth A], D, E	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Other Ion Channels	Bestrophin-1 (BEST1) 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.