Annotations: 6CAA

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	8092951	4007786	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092952	3002647	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092952	3002647	SCOP2B (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	e6caaA1	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	e6caaB1	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)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Electrogenic sodium bicarbonate cotransporter 1	antiporter activity active transmembrane transporter activity inorganic molecular entity transmembrane transporter activity transporter activity transmembrane transporter activity inorganic anion transmembrane transporter activity solute:inorganic anion antiporter activity secondary active transmembrane transporter activity monoatomic anion transmembrane transporter activity monoatomic ion transmembrane transporter activity monoatomic cation transmembrane transporter activity bicarbonate transmembrane transporter activity solute:sodium symporter activity solute:monoatomic cation symporter activity antiporter activity active transmembrane transporter activity inorganic molecular entity transmembrane transporter activity transporter activity transmembrane transporter activity inorganic anion transmembrane transporter activity solute:inorganic anion antiporter activity secondary active transmembrane transporter activity monoatomic anion transmembrane transporter activity monoatomic ion transmembrane transporter activity monoatomic cation transmembrane transporter activity bicarbonate transmembrane transporter activity solute:sodium symporter activity solute:monoatomic cation symporter activity sodium ion transmembrane transporter activity active monoatomic ion transmembrane transporter activity monoatomic cation:bicarbonate symporter activity inorganic cation transmembrane transporter activity metal ion transmembrane transporter activity symporter activity organic anion transmembrane transporter activity sodium:bicarbonate symporter activity identical protein binding protein binding binding	ribonucleotide catabolic process pyridine nucleotide catabolic process regulation of cellular process oxoacid metabolic process carbohydrate catabolic process carbohydrate derivative metabolic process organophosphate catabolic process regulation of generation of precursor metabolites and energy positive regulation of phosphate metabolic process nucleoside phosphate catabolic process organic acid metabolic process regulation of primary metabolic process regulation of ATP metabolic process nucleobase-containing compound metabolic process positive regulation of metabolic process ribonucleotide catabolic process pyridine nucleotide catabolic process regulation of cellular process oxoacid metabolic process carbohydrate catabolic process carbohydrate derivative metabolic process organophosphate catabolic process regulation of generation of precursor metabolites and energy positive regulation of phosphate metabolic process nucleoside phosphate catabolic process organic acid metabolic process regulation of primary metabolic process regulation of ATP metabolic process nucleobase-containing compound metabolic process positive regulation of metabolic process regulation of purine nucleotide catabolic process positive regulation of nucleotide catabolic process regulation of small molecule metabolic process glycolytic process regulation of phosphate metabolic process regulation of nucleotide metabolic process phosphate-containing compound metabolic process pyridine-containing compound metabolic process small molecule metabolic process regulation of nucleobase-containing compound metabolic process purine ribonucleotide catabolic process phosphorus metabolic process pyridine nucleotide metabolic process nucleoside phosphate metabolic process nicotinamide nucleotide metabolic process pyruvate metabolic process regulation of carbohydrate catabolic process regulation of biological process positive regulation of nucleobase-containing compound metabolic process positive regulation of phosphorus metabolic process purine nucleoside diphosphate metabolic process primary metabolic process purine-containing compound catabolic process nucleotide metabolic process regulation of purine nucleotide metabolic process nucleobase-containing compound catabolic process positive regulation of ATP metabolic process nucleoside diphosphate metabolic process purine nucleoside diphosphate catabolic process nucleoside diphosphate catabolic process metabolic process regulation of phosphorus metabolic process regulation of nucleotide catabolic process nucleoside triphosphate metabolic process positive regulation of carbohydrate metabolic process monocarboxylic acid metabolic process purine ribonucleotide metabolic process regulation of metabolic process pyridine-containing compound catabolic process ribose phosphate metabolic process ATP metabolic process catabolic process positive regulation of nucleotide metabolic process positive regulation of purine nucleotide catabolic process positive regulation of biological process purine nucleotide metabolic process ribonucleotide metabolic process nucleobase-containing small molecule metabolic process purine ribonucleoside triphosphate metabolic process ribonucleoside diphosphate metabolic process ribonucleoside diphosphate catabolic process regulation of carbohydrate metabolic process ribonucleoside triphosphate metabolic process positive regulation of cellular process nucleotide catabolic process purine nucleoside triphosphate metabolic process carbohydrate metabolic process purine nucleotide catabolic process carbohydrate derivative catabolic process positive regulation of glycolytic process biological regulation ADP catabolic process carboxylic acid metabolic process generation of precursor metabolites and energy regulation of catabolic process regulation of glycolytic process purine-containing compound metabolic process positive regulation of purine nucleotide metabolic process positive regulation of catabolic process ADP metabolic process organophosphate metabolic process purine ribonucleoside diphosphate metabolic process cellular process positive regulation of small molecule metabolic process purine ribonucleoside diphosphate catabolic process regulation of biological quality regulation of membrane potential localization transport monoatomic ion transport monoatomic cation transport establishment of localization sodium ion transport metal ion transport sodium ion export across plasma membrane monoatomic ion transmembrane transport export from cell sodium ion transmembrane transport inorganic ion transmembrane transport export across plasma membrane inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport bicarbonate transport organic anion transport 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 multicellular organismal process system process circulatory system process vascular process in circulatory system vascular transport transport across blood-brain barrier	cellular anatomical structure membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell surface cell periphery plasma membrane cellular anatomical structure membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle cell surface 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, B	IPR011531	Bicarbonate transporter-like, transmembrane domain	Domain
A, B	IPR003024	Sodium bicarbonate cotransporter	Family
A, B	IPR013769	Band 3 cytoplasmic domain	Domain
A, B	IPR016152	Phosphotransferase/anion transporter	Homologous Superfamily
A, B	IPR003020	Bicarbonate transporter, eukaryotic	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: Q9Y6R1	autosomal recessive proximal renal tubular acidosis renal tubular acidosis cataract retinitis pigmentosa glaucoma Liver Cirrhosis, Experimental lung adenocarcinoma interstitial cystitis lung cancer malignant ependymoma atypical teratoid rhabdoid tumor medulloblastoma oligodendroglioma chronic obstructive pulmonary disease pancreatic intraductal papillary-mucinous carcinoma autosomal recessive proximal renal tubular acidosis renal tubular acidosis cataract retinitis pigmentosa glaucoma Liver Cirrhosis, Experimental lung adenocarcinoma interstitial cystitis lung cancer malignant ependymoma atypical teratoid rhabdoid tumor medulloblastoma oligodendroglioma chronic obstructive pulmonary disease pancreatic intraductal papillary-mucinous carcinoma Crohn disease Pick disease developmental disability progressive supranuclear palsy Down syndrome tuberculosis glioblastoma invasive ductal breast carcinoma lung carcinoma Alzheimer disease malignant mesothelioma nephrosclerosis ovarian cancer cone-rod dystrophy pancreatic intraductal papillary-mucinous neoplasm cystic fibrosis pituitary cancer retinal degeneration ductal breast carcinoma in situ ulcerative colitis intellectual disability large cell medulloblastoma malignant colon neoplasm astrocytic tumor malignant pancreatic neoplasm band keratopathy non-small cell lung carcinoma pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia primitive neuroectodermal tumor distal renal tubular acidosis

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Solute Carrier (SLC) Transporter Superfamily	SLC4A4 Na⁺-coupled acid-base transporter NBCe1

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.