Annotations: 7RTM

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Sodium-coupled acid-base transporter, SLC4A-like	8107249	4007786	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Nucleobase/cation symporter 2, NCS2-like	8107250	3002647	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	HCO3_cotransp	e7rtmA1	A: alpha complex topology	X: Uracil Transporter UraA (From Topology)	H: Uracil Transporter UraA (From Topology)	T: Uracil Transporter UraA	F: HCO3_cotransp	ECOD (1.6)
B	HCO3_cotransp	e7rtmB1	A: alpha complex topology	X: Uracil Transporter UraA (From Topology)	H: Uracil Transporter UraA (From Topology)	T: Uracil Transporter UraA	F: HCO3_cotransp	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00955	HCO3- transporter integral membrane domain (HCO3_cotransp)	HCO3- transporter integral membrane domain	This family contains Band 3 anion exchange proteins that exchange CL-/HCO3- such as Swiss:P48751. This family also includes cotransporters of Na+/HCO3- such as Swiss:O15153.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Electroneutral sodium bicarbonate exchanger 1	monoatomic cation transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity sodium ion transmembrane transporter activity metal ion transmembrane transporter activity transmembrane transporter activity bicarbonate transmembrane transporter activity organic anion transmembrane transporter activity solute:sodium symporter activity solute:monoatomic cation symporter activity secondary active transmembrane transporter activity active monoatomic ion transmembrane transporter activity monoatomic cation transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity sodium ion transmembrane transporter activity metal ion transmembrane transporter activity transmembrane transporter activity bicarbonate transmembrane transporter activity organic anion transmembrane transporter activity solute:sodium symporter activity solute:monoatomic cation symporter activity secondary active transmembrane transporter activity active monoatomic ion transmembrane transporter activity monoatomic cation:bicarbonate symporter activity active transmembrane transporter activity symporter activity sodium:bicarbonate symporter activity metal cation:monoatomic cation antiporter activity chloride transmembrane transporter activity monoatomic anion transmembrane transporter activity sodium,bicarbonate:chloride antiporter activity bicarbonate:monoatomic anion antiporter activity antiporter activity chloride:bicarbonate antiporter activity inorganic anion transmembrane transporter activity solute:inorganic anion antiporter activity identical protein binding protein binding binding	protein localization establishment of protein localization cellular localization nitrogen compound transport transport secretion basolateral protein secretion establishment of protein localization to extracellular region export from cell protein secretion establishment of localization protein localization to extracellular region localization secretion by cell protein transport protein localization establishment of protein localization cellular localization nitrogen compound transport transport secretion basolateral protein secretion establishment of protein localization to extracellular region export from cell protein secretion establishment of localization protein localization to extracellular region localization secretion by cell protein transport cellular macromolecule localization macromolecule localization cellular process monoatomic ion transmembrane transport inorganic ion transmembrane transport inorganic anion transmembrane transport chloride transport transmembrane transport chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport inorganic anion transport bicarbonate transport organic anion transport sodium ion transmembrane transport metal ion transport inorganic cation transmembrane transport monoatomic cation transmembrane transport monoatomic cation transport sodium ion transport trans-synaptic signaling regulation of biological process regulation of signaling regulation of cellular process modulation of chemical synaptic transmission signaling biological regulation cell-cell signaling chemical synaptic transmission cell communication synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling regulation of cell communication regulation of biological quality regulation of membrane potential positive regulation of cell communication regulation of localization regulated exocytosis positive regulation of neurotransmitter secretion synaptic vesicle cycle synaptic vesicle exocytosis vesicle-mediated transport vesicle-mediated transport in synapse positive regulation of regulated secretory pathway establishment of localization in cell positive regulation of neurotransmitter transport neurotransmitter secretion regulation of synaptic vesicle exocytosis positive regulation of synaptic transmission neurotransmitter transport regulation of secretion signal release from synapse exocytosis positive regulation of biological process positive regulation of secretion by cell positive regulation of exocytosis regulation of regulated secretory pathway regulation of secretion by cell positive regulation of secretion signal release positive regulation of cellular process positive regulation of synaptic vesicle exocytosis regulation of transport regulation of neurotransmitter transport regulation of vesicle-mediated transport positive regulation of transport regulation of neurotransmitter secretion regulation of exocytosis positive regulation of signaling homeostatic process regulation of intracellular pH cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis regulation of pH monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis regulation of cellular pH intracellular monoatomic ion homeostasis	symmetric synapse neuron to neuron synapse synapse cell junction cellular anatomical entity membrane cell periphery apical part of cell plasma membrane plasma membrane region apical plasma membrane axon neuron projection axon terminus symmetric synapse neuron to neuron synapse synapse cell junction cellular anatomical entity membrane cell periphery apical part of cell plasma membrane plasma membrane region apical plasma membrane axon neuron projection axon terminus plasma membrane bounded cell projection presynapse cell projection distal axon terminal bouton neuron projection terminus presynaptic membrane synaptic membrane basal part of cell basal plasma membrane basolateral plasma membrane glial cell projection somatodendritic compartment dendrite dendritic tree glutamatergic synapse hippocampal mossy fiber neuronal cell body membrane cell body cell body membrane neuronal cell body membrane-bounded organelle intracellular anatomical structure intracellular vesicle transport vesicle membrane endomembrane system intracellular organelle bounding membrane of organelle cytoplasmic vesicle vesicle membrane synaptic vesicle synaptic vesicle membrane vesicle transport vesicle exocytic vesicle membrane intracellular membrane-bounded organelle cytoplasmic vesicle membrane organelle secretory vesicle cytoplasm organelle membrane exocytic vesicle asymmetric synapse

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR003024	Sodium bicarbonate cotransporter	Family
A, B	IPR013769	Band 3 cytoplasmic domain	Domain
A, B	IPR003020	Bicarbonate transporter, eukaryotic	Family
A, B	IPR011531	Bicarbonate transporter-like, transmembrane domain	Domain
A, B	IPR016152	Phosphotransferase/anion transporter	Homologous Superfamily

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B	OPM	Transmembrane	Alpha-helical polytopic	APC (Amino acid-Polyamine-organoCation) superfamily	Anion exchanger family

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 R01GM133198.