Annotations: 7TW1

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth B]	SCOP2B Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092954	3002647	SCOP2B (2022-06-29)
A [auth B]	SCOP2B Superfamily	Phoshotransferase/anion transport protein	8033412	3000490	SCOP2B (2022-06-29)
B [auth A]	SCOP2B Superfamily	Phoshotransferase/anion transport protein	8033412	3000490	SCOP2B (2022-06-29)
B [auth A]	SCOP2B Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092954	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)
B [auth A]	HCO3_cotransp	e7tw1A1	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 [auth A]	Band_3_cyto	e7tw1A2	A: a+b three layers	X: Phoshotransferase/anion transport protein (From Topology)	H: Phoshotransferase/anion transport protein (From Topology)	T: Phoshotransferase/anion transport protein	F: Band_3_cyto	ECOD (1.6)
C [auth E]	Transglut_N	e7tw1E3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Transglut_N	ECOD (1.6)
C [auth E]	Transglut_C_1	e7tw1E4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Transglut_C_1	ECOD (1.6)
C [auth E]	Transglut_C	e7tw1E1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Transglut_C	ECOD (1.6)
C [auth E]	Transglut_core	e7tw1E2	A: a+b complex topology	X: Cysteine proteinases-like	H: Cysteine proteinases (From Topology)	T: Cysteine proteinases	F: Transglut_core	ECOD (1.6)
D [auth F]	Transglut_N	e7tw1F4	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Transglut_N	ECOD (1.6)
D [auth F]	Transglut_C_1	e7tw1F1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Transglut_C_1	ECOD (1.6)
D [auth F]	Transglut_C	e7tw1F2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Transglut_C	ECOD (1.6)
D [auth F]	Transglut_core	e7tw1F3	A: a+b complex topology	X: Cysteine proteinases-like	H: Cysteine proteinases (From Topology)	T: Cysteine proteinases	F: Transglut_core	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth B], B [auth A]	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
A [auth B], B [auth A]	PF07565	Band 3 cytoplasmic domain (Band_3_cyto)	Band 3 cytoplasmic domain	This family contains the cytoplasmic domain of the Band 3 anion exchange proteins that exchange Cl-/HCO3-. Band 3 constitutes the most abundant polypeptide in the red blood cell membrane, comprising 25% of the total membrane protein. The cytoplasmic ...	This family contains the cytoplasmic domain of the Band 3 anion exchange proteins that exchange Cl-/HCO3-. Band 3 constitutes the most abundant polypeptide in the red blood cell membrane, comprising 25% of the total membrane protein. The cytoplasmic domain of band 3 functions primarily as an anchoring site for other membrane-associated proteins. Included among the protein ligands of cdb3 are ankyrin, protein 4.2, protein 4.1, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), phosphofructokinase, aldolase, hemoglobin, hemichromes, and the protein tyrosine kinase (p72syk). [1]	Domain
C [auth E], D [auth F]	PF00868	Transglutaminase family (Transglut_N)	Transglutaminase family	-	Domain
C [auth E], D [auth F]	PF00927	Transglutaminase family, C-terminal ig like domain (Transglut_C)	Transglutaminase family, C-terminal ig like domain	-	Domain
C [auth E], D [auth F]	PF01841	Transglutaminase-like superfamily (Transglut_core)	Transglutaminase-like superfamily	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B], B [auth A]	Band 3 anion transport protein	cytoskeletal protein binding ankyrin binding protein binding binding hemoglobin binding bicarbonate transmembrane transporter activity transporter activity transmembrane transporter activity organic anion transmembrane transporter activity chloride transmembrane transporter activity monoatomic anion transmembrane transporter activity bicarbonate:monoatomic anion antiporter activity secondary active transmembrane transporter activity antiporter activity cytoskeletal protein binding ankyrin binding protein binding binding hemoglobin binding bicarbonate transmembrane transporter activity transporter activity transmembrane transporter activity organic anion transmembrane transporter activity chloride transmembrane transporter activity monoatomic anion transmembrane transporter activity bicarbonate:monoatomic anion antiporter activity secondary active transmembrane transporter activity antiporter activity active monoatomic ion transmembrane transporter activity active transmembrane transporter activity inorganic molecular entity transmembrane transporter activity chloride:bicarbonate antiporter activity monoatomic ion transmembrane transporter activity inorganic anion transmembrane transporter activity solute:inorganic anion antiporter activity protein-membrane adaptor activity protein-macromolecule adaptor activity molecular adaptor activity identical protein binding protein homodimerization activity protein dimerization activity	multicellular organismal process regulation of body fluid levels wound healing response to stimulus hemostasis biological regulation blood coagulation response to stress coagulation regulation of biological quality response to wounding developmental process erythrocyte development cellular developmental process multicellular organismal process regulation of body fluid levels wound healing response to stimulus hemostasis biological regulation blood coagulation response to stress coagulation regulation of biological quality response to wounding developmental process erythrocyte development cellular developmental process homeostatic process hemopoiesis cell development erythrocyte differentiation multicellular organismal-level homeostasis myeloid cell differentiation immune system process cell differentiation anatomical structure development myeloid cell development homeostasis of number of cells cellular process myeloid cell homeostasis erythrocyte homeostasis transport monoatomic ion transmembrane transport inorganic ion transmembrane transport inorganic anion transmembrane transport establishment of localization chloride transport transmembrane transport localization chloride transmembrane transport monoatomic anion transport monoatomic anion transmembrane transport monoatomic ion transport inorganic anion transport cellular homeostasis chemical homeostasis monoatomic ion homeostasis intracellular chemical homeostasis intracellular monoatomic ion homeostasis bicarbonate transport organic anion transport protein localization protein localization to cell periphery cellular localization protein localization to plasma membrane cellular macromolecule localization macromolecule localization localization within membrane protein localization to membrane renal system process system process regulation of urine volume negative regulation of urine volume membrane organization phospholipid translocation lipid localization phospholipid transport lipid transport lipid translocation regulation of membrane lipid distribution plasma membrane phospholipid scrambling cellular component organization plasma membrane organization cellular component organization or biogenesis endomembrane system organization organophosphate ester transport pH elevation regulation of pH monoatomic cation homeostasis pyridine nucleotide catabolic process oxoacid metabolic process carbohydrate catabolic process organophosphate catabolic process carbohydrate derivative metabolic process regulation of generation of precursor metabolites and energy nucleoside phosphate catabolic process organic acid metabolic process regulation of primary metabolic process regulation of ATP metabolic process regulation of purine nucleotide catabolic process negative regulation of nucleotide metabolic process regulation of small molecule metabolic process regulation of nucleotide metabolic process regulation of phosphate metabolic process phosphate-containing compound metabolic process small molecule metabolic process purine ribonucleotide catabolic process negative regulation of carbohydrate metabolic process nucleoside phosphate metabolic process organonitrogen compound catabolic process pyruvate metabolic process cellular metabolic process negative regulation of metabolic process negative regulation of purine nucleotide catabolic process purine nucleoside diphosphate metabolic process primary metabolic process purine-containing compound catabolic process regulation of purine nucleotide metabolic process nucleobase-containing compound catabolic process nucleoside diphosphate metabolic process metabolic process regulation of phosphorus metabolic process monocarboxylic acid metabolic process pyridine-containing compound catabolic process ribose phosphate metabolic process ATP metabolic process negative regulation of purine nucleotide metabolic process negative regulation of phosphate metabolic process nucleobase-containing small molecule metabolic process purine ribonucleoside triphosphate metabolic process negative regulation of nucleotide catabolic process purine nucleotide catabolic process carbohydrate derivative catabolic process regulation of glycolytic process through fructose-6-phosphate purine-containing compound metabolic process ADP metabolic process negative regulation of phosphorus metabolic process purine ribonucleoside diphosphate metabolic process purine ribonucleoside diphosphate catabolic process negative regulation of glycolytic process through fructose-6-phosphate ribonucleotide catabolic process regulation of cellular process negative regulation of small molecule metabolic process negative regulation of glycolytic process negative regulation of biological process negative regulation of ATP metabolic process negative regulation of cellular metabolic process nucleobase-containing compound metabolic process glycolytic process pyridine-containing compound metabolic process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process phosphorus metabolic process pyridine nucleotide metabolic process nicotinamide nucleotide metabolic process regulation of carbohydrate catabolic process regulation of biological process regulation of cellular metabolic process nucleotide metabolic process purine nucleoside diphosphate catabolic process nucleoside diphosphate catabolic process regulation of nucleotide catabolic process nucleoside triphosphate metabolic process purine ribonucleotide metabolic process regulation of metabolic process catabolic process purine nucleotide metabolic process ribonucleotide metabolic process negative regulation of cellular process ribonucleoside diphosphate metabolic process ribonucleoside diphosphate catabolic process regulation of carbohydrate metabolic process nucleotide catabolic process ribonucleoside triphosphate metabolic process negative regulation of catabolic process purine nucleoside triphosphate metabolic process carbohydrate metabolic process organonitrogen compound metabolic process ADP catabolic process carboxylic acid metabolic process regulation of catabolic process generation of precursor metabolites and energy regulation of glycolytic process organophosphate metabolic process glycolytic process through fructose-6-phosphate regulation of intracellular pH intracellular monoatomic cation homeostasis regulation of cellular pH	membrane cellular anatomical entity intracellular anatomical structure Z disc sarcomere intracellular organelle I band organelle intracellular non-membrane-bounded organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer membrane cellular anatomical entity intracellular anatomical structure Z disc sarcomere intracellular organelle I band organelle intracellular non-membrane-bounded organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex non-membrane-bounded organelle ankyrin-1 complex protein-containing complex membrane protein complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region extracellular space vesicle extracellular membrane-bounded organelle cell periphery plasma membrane basal part of cell basal plasma membrane plasma membrane region basolateral plasma membrane blood microparticle cytoplasmic side of plasma membrane cytoplasmic side of membrane side of membrane cell cortex cortical cytoskeleton cytoskeleton
C [auth E], D [auth F]	Protein 4.2	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 structural constituent of cytoskeleton structural molecule activity aminoacyltransferase activity protein-glutamine gamma-glutamyltransferase activity catalytic activity, acting on a protein acyltransferase activity transferase activity catalytic activity	developmental process regulation of biological process regulation of developmental process biological regulation regulation of cell shape cell morphogenesis regulation of cell morphogenesis anatomical structure morphogenesis anatomical structure development regulation of biological quality regulation of anatomical structure morphogenesis organonitrogen compound metabolic process metabolic process primary metabolic process developmental process regulation of biological process regulation of developmental process biological regulation regulation of cell shape cell morphogenesis regulation of cell morphogenesis anatomical structure morphogenesis anatomical structure development regulation of biological quality regulation of anatomical structure morphogenesis organonitrogen compound metabolic process metabolic process primary metabolic process protein metabolic process macromolecule metabolic process hemoglobin metabolic process immune system development multicellular organism development multicellular organismal process spleen development immune system process animal organ development hematopoietic or lymphoid organ development system development multicellular organismal-level iron ion homeostasis inorganic ion homeostasis multicellular organismal-level homeostasis chemical homeostasis homeostatic process multicellular organismal-level chemical homeostasis monoatomic ion homeostasis monoatomic cation homeostasis erythrocyte development cellular developmental process hemopoiesis cell development erythrocyte maturation developmental maturation erythrocyte differentiation myeloid cell differentiation anatomical structure maturation cell differentiation myeloid cell development homeostasis of number of cells cellular process myeloid cell homeostasis cell maturation erythrocyte homeostasis	ankyrin-1 complex protein-containing complex membrane membrane protein complex cellular anatomical entity intracellular organelle intracellular anatomical structure cytoskeleton organelle intracellular non-membrane-bounded organelle non-membrane-bounded organelle cell periphery plasma membrane cell cortex ankyrin-1 complex protein-containing complex membrane membrane protein complex cellular anatomical entity intracellular organelle intracellular anatomical structure cytoskeleton organelle intracellular non-membrane-bounded organelle non-membrane-bounded organelle cell periphery plasma membrane cell cortex cortical cytoskeleton cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth B], B [auth A]	IPR013769	Band 3 cytoplasmic domain	Domain
A [auth B], B [auth A]	IPR001717	Anion exchange protein	Family
A [auth B], B [auth A]	IPR003020	Bicarbonate transporter, eukaryotic	Family
A [auth B], B [auth A]	IPR011531	Bicarbonate transporter-like, transmembrane domain	Domain
A [auth B], B [auth A]	IPR002977	Anion exchange protein 1	Family
A [auth B], B [auth A]	IPR016152	Phosphotransferase/anion transporter	Homologous Superfamily
A [auth B], B [auth A]	IPR018241	Anion exchange, conserved site	Conserved Site
C [auth E], D [auth F]	IPR036985	Transglutaminase-like superfamily	Homologous Superfamily
C [auth E], D [auth F]	IPR036238	Transglutaminase, C-terminal domain superfamily	Homologous Superfamily
C [auth E], D [auth F]	IPR013808	Transglutaminase, active site	Active Site
C [auth E], D [auth F]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C [auth E], D [auth F]	IPR002931	Transglutaminase-like	Domain
C [auth E], D [auth F]	IPR014756	Immunoglobulin E-set	Homologous Superfamily
C [auth E], D [auth F]	IPR038765	Papain-like cysteine peptidase superfamily	Homologous Superfamily
C [auth E], D [auth F]	IPR001102	Transglutaminase, N-terminal	Domain
C [auth E], D [auth F]	IPR008958	Transglutaminase, C-terminal	Domain
C [auth E], D [auth F]	IPR050779	Protein-glutamine gamma-glutamyltransferases	Family
C [auth E], D [auth F]	IPR023608	Protein-glutamine gamma-glutamyltransferase, animal	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A [auth B], B [auth A]	Pharos: P02730	hereditary elliptocytosis hereditary spherocytosis renal tubular acidosis hereditary spherocytosis type 4 cryohydrocytosis southeast Asian ovalocytosis hemolytic anemia renal tubular acidosis, distal, 4, with hemolytic anemia malaria hematologic disease Ovalocytosis, Malaysian-Melanesian-Filipino Type autosomal dominant distal renal tubular acidosis familial hemolytic anemia distal renal tubular acidosis MALT lymphoma hereditary elliptocytosis hereditary spherocytosis renal tubular acidosis hereditary spherocytosis type 4 cryohydrocytosis southeast Asian ovalocytosis hemolytic anemia renal tubular acidosis, distal, 4, with hemolytic anemia malaria hematologic disease Ovalocytosis, Malaysian-Melanesian-Filipino Type autosomal dominant distal renal tubular acidosis familial hemolytic anemia distal renal tubular acidosis MALT lymphoma renal tubular acidosis, distal, 3, with or without sensorineural hearing loss tuberculosis psoriasis osteosarcoma
C [auth E], D [auth F]	Pharos: P16452	hereditary spherocytosis hereditary spherocytosis type 5 familial hemolytic anemia Anemia, hereditary spherocytic hemolytic ductal breast carcinoma in situ MALT lymphoma congenital anemia osteosarcoma hemolytic anemia invasive ductal breast carcinoma ovarian cancer

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A [auth B], B [auth A], C [auth E], D [auth F]	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 [auth B], B [auth A], C [auth E], D [auth F]	PDBTM	Annotated as membrane protein by PDBTM

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.