Annotations: 7X1I

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	TRAPP	e7x1iA1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: TRAPP	ECOD (v294.1)
B	TRAPP	e7x1iB1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: TRAPP	ECOD (v294.1)

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	Isoform 1 of Solute carrier family 4 member 11	water transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity monoatomic ion channel activity proton channel activity channel activity monoatomic ion transmembrane transporter activity bicarbonate transmembrane transporter activity active transmembrane transporter activity active borate transmembrane transporter activity water transmembrane transporter activity transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity proton transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity monoatomic ion channel activity proton channel activity channel activity monoatomic ion transmembrane transporter activity bicarbonate transmembrane transporter activity active transmembrane transporter activity active borate transmembrane transporter activity symporter activity secondary active transmembrane transporter activity antiporter activity solute:inorganic anion antiporter activity sodium channel activity sodium ion transmembrane transporter activity metal ion transmembrane transporter activity protein binding binding protein dimerization activity	monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization chemical homeostasis homeostatic process monoatomic ion homeostasis cellular homeostasis monoatomic cation transmembrane transport transmembrane transport localization transport proton transmembrane transport monoatomic ion transmembrane transport monoatomic ion transport cellular process monoatomic cation transport establishment of localization chemical homeostasis homeostatic process monoatomic ion homeostasis cellular homeostasis intracellular monoatomic cation homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis regulation of mitochondrial membrane potential biological regulation regulation of biological quality regulation of membrane potential bicarbonate transport organic anion transport borate transport inorganic anion transport monoatomic anion transport cellular response to stimulus response to oxidative stress cellular response to chemical stimulus response to stimulus cellular response to stress response to stress response to chemical cellular response to oxidative stress cellular response to chemical stress sodium ion transport metal ion transport fluid transport developmental process regulation of biological process regulation of cellular process regulation of developmental process cellular developmental process regulation of cell differentiation stem cell differentiation cell differentiation regulation of stem cell differentiation mesenchymal stem cell differentiation regulation of mesenchymal stem cell differentiation response to osmotic stress cellular hypotonic response cellular response to osmotic stress cellular response to environmental stimulus hypotonic response response to abiotic stimulus cellular response to abiotic stimulus	cell periphery cellular anatomical structure apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane basal part of cell basal plasma membrane basolateral plasma membrane membrane-bounded organelle vesicle membrane organelle vesicle cell periphery cellular anatomical structure apical part of cell membrane plasma membrane plasma membrane region apical plasma membrane basal part of cell basal plasma membrane basolateral plasma membrane membrane-bounded organelle vesicle membrane organelle vesicle organelle membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR003020	Bicarbonate transporter, eukaryotic	Family
A, B	IPR011531	Bicarbonate transporter-like, transmembrane domain	Domain
A, B	IPR016152	Phosphotransferase/anion transporter	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: Q8NBS3	corneal dystrophy-perceptive deafness syndrome corneal dystrophy, Fuchs endothelial, 4 Fuchs' endothelial dystrophy congenital hereditary endothelial dystrophy of cornea corneal dystrophy non-small cell lung carcinoma pancreatic intraductal papillary-mucinous carcinoma Abnormality of the cornea hepatitis C virus infection lung adenocarcinoma malignant pancreatic neoplasm ovarian cancer pancreatic intraductal papillary-mucinous neoplasm atopic eczema corneal edema corneal dystrophy-perceptive deafness syndrome corneal dystrophy, Fuchs endothelial, 4 Fuchs' endothelial dystrophy congenital hereditary endothelial dystrophy of cornea corneal dystrophy non-small cell lung carcinoma pancreatic intraductal papillary-mucinous carcinoma Abnormality of the cornea hepatitis C virus infection lung adenocarcinoma malignant pancreatic neoplasm ovarian cancer pancreatic intraductal papillary-mucinous neoplasm atopic eczema corneal edema cryohydrocytosis intellectual disability lung carcinoma medulloblastoma pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia breast fibroadenoma corneal endothelial dystrophy keratoconus malignant ependymoma

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B	PDBTM	Annotated as membrane protein by PDBTM

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	SLC4A11 NH₃-stimulated acid-base transporter BTR1, inward-facing state, pH 5.5

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.