Annotations: 7BXU

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth A]	Voltage_CLC	e7bxuA1	A: alpha complex topology	X: Clc chloride channel (From Topology)	H: Clc chloride channel (From Topology)	T: Clc chloride channel	F: Voltage_CLC	ECOD (1.6)
B [auth A]	IMPDH_2nd_1	e7bxuA2	A: a+b duplicates or obligate multimers	X: CBS-domain (From Topology)	H: CBS-domain (From Topology)	T: CBS-domain	F: IMPDH_2nd_1	ECOD (1.6)
D [auth B]	Voltage_CLC	e7bxuB1	A: alpha complex topology	X: Clc chloride channel (From Topology)	H: Clc chloride channel (From Topology)	T: Clc chloride channel	F: Voltage_CLC	ECOD (1.6)
D [auth B]	IMPDH_2nd_1	e7bxuB2	A: a+b duplicates or obligate multimers	X: CBS-domain (From Topology)	H: CBS-domain (From Topology)	T: CBS-domain	F: IMPDH_2nd_1	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth C], C [auth D]	PF09777	Osteopetrosis-associated transmembrane protein 1 precursor (OSTMP1)	Osteopetrosis-associated transmembrane protein 1 precursor	-	Family
B [auth A], D [auth B]	PF00571	CBS domain (CBS)	CBS domain	CBS domains are small intracellular modules that pair together to form a stable globular domain [2]. This family represents a single CBS domain. Pairs of these domains have been termed a Bateman domain [6]. CBS domains have been shown to bind ligands ...	CBS domains are small intracellular modules that pair together to form a stable globular domain [2]. This family represents a single CBS domain. Pairs of these domains have been termed a Bateman domain [6]. CBS domains have been shown to bind ligands with an adenosyl group such as AMP, ATP and S-AdoMet [5]. CBS domains are found attached to a wide range of other protein domains suggesting that CBS domains may play a regulatory role making proteins sensitive to adenosyl carrying ligands. The region containing the CBS domains in Cystathionine-beta synthase is involved in regulation by S-AdoMet [4]. CBS domain pairs from AMPK bind AMP or ATP [5]. The CBS domains from IMPDH and the chloride channel CLC2 bind ATP [5].	Domain
B [auth A], D [auth B]	PF00654	Voltage gated chloride channel (Voltage_CLC)	Voltage gated chloride channel	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth C], C [auth D]	Osteopetrosis-associated transmembrane protein 1	-	developmental process myeloid leukocyte differentiation cellular developmental process hemopoiesis cell development myeloid cell differentiation cell differentiation osteoclast differentiation anatomical structure development cellular process leukocyte differentiation localization transepithelial chloride transport transepithelial transport developmental process myeloid leukocyte differentiation cellular developmental process hemopoiesis cell development myeloid cell differentiation cell differentiation osteoclast differentiation anatomical structure development cellular process leukocyte differentiation localization transepithelial chloride transport transepithelial transport transport monoatomic anion transport monoatomic ion transport establishment of localization chloride transport inorganic anion transport	protein-containing complex transmembrane transporter complex membrane chloride channel complex membrane protein complex cellular anatomical entity transporter complex monoatomic ion channel complex intracellular anatomical structure cytoplasm cytosol vacuolar membrane membrane-bounded organelle lytic vacuole protein-containing complex transmembrane transporter complex membrane chloride channel complex membrane protein complex cellular anatomical entity transporter complex monoatomic ion channel complex intracellular anatomical structure cytoplasm cytosol vacuolar membrane membrane-bounded organelle lytic vacuole vacuole intracellular membrane-bounded organelle intracellular organelle lytic vacuole membrane bounding membrane of organelle organelle lysosomal membrane organelle membrane lysosome
B [auth A], D [auth B]	H(+)/Cl(-) exchange transporter 7	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding voltage-gated chloride channel activity monoatomic anion transmembrane transporter activity chloride transmembrane transporter activity gated channel activity monoatomic ion channel activity voltage-gated channel activity voltage-gated monoatomic ion channel activity voltage-gated monoatomic anion channel activity passive transmembrane transporter activity inorganic molecular entity transmembrane transporter activity channel activity monoatomic anion channel activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity inorganic anion transmembrane transporter activity chloride channel activity antiporter activity active transmembrane transporter activity secondary active transmembrane transporter activity	localization transepithelial chloride transport transepithelial transport transport monoatomic anion transport monoatomic ion transport establishment of localization chloride transport inorganic anion transport	protein-containing complex transmembrane transporter complex membrane chloride channel complex membrane protein complex cellular anatomical entity transporter complex monoatomic ion channel complex vacuolar membrane membrane-bounded organelle intracellular anatomical structure lytic vacuole vacuole intracellular membrane-bounded organelle protein-containing complex transmembrane transporter complex membrane chloride channel complex membrane protein complex cellular anatomical entity transporter complex monoatomic ion channel complex vacuolar membrane membrane-bounded organelle intracellular anatomical structure lytic vacuole vacuole intracellular membrane-bounded organelle intracellular organelle lytic vacuole membrane bounding membrane of organelle organelle lysosomal membrane cytoplasm organelle membrane lysosome

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth C], C [auth D]	IPR019172	Osteopetrosis-associated transmembrane protein 1 precursor	Family
B [auth A], D [auth B]	IPR046342	CBS domain superfamily	Homologous Superfamily
B [auth A], D [auth B]	IPR014743	Chloride channel, core	Homologous Superfamily
B [auth A], D [auth B]	IPR000644	CBS domain	Domain
B [auth A], D [auth B]	IPR001807	Chloride channel, voltage gated	Family
B [auth A], D [auth B]	IPR002249	Chloride channel ClC-7	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A [auth C], C [auth D]	Pharos: Q86WC4	osteopetrosis autosomal recessive osteopetrosis 5 infantile osteopetrosis with neuroaxonal dysplasia atypical teratoid rhabdoid tumor dermatomyositis lung cancer Osteopetrosis, Autosomal Recessive 5 psoriasis autosomal recessive osteopetrosis 1 glioblastoma interstitial cystitis myopathy osteosarcoma rheumatoid arthritis hydrocephalus osteopetrosis autosomal recessive osteopetrosis 5 infantile osteopetrosis with neuroaxonal dysplasia atypical teratoid rhabdoid tumor dermatomyositis lung cancer Osteopetrosis, Autosomal Recessive 5 psoriasis autosomal recessive osteopetrosis 1 glioblastoma interstitial cystitis myopathy osteosarcoma rheumatoid arthritis hydrocephalus large cell medulloblastoma ovarian cancer subependymal giant cell astrocytoma
B [auth A], D [auth B]	Pharos: P51798	osteopetrosis autosomal dominant osteopetrosis 2 autosomal recessive osteopetrosis 4 autosomal recessive osteopetrosis 6 diabetes mellitus intellectual disability Osteopetrosis, Autosomal Recessive 4 autosomal recessive osteopetrosis heart disease autosomal recessive osteopetrosis 2 psoriasis

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A [auth C], B [auth A], C [auth D], D [auth B]	OPM	Transmembrane	Alpha-helical polytopic	Chloride transporter (ClC)	Chloride transporter

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A [auth C], B [auth A], C [auth D], D [auth B]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	H⁺/Cl^- or F^- Exchange Transporters	CLC-7 Cl^-/H⁺ exchanger in complex with OSTM1

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.