Annotations: 8EEQ

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth C]	PF00955	e8eeqC1	A: alpha complex topology	X: Uracil Transporter UraA (From Topology)	H: Uracil Transporter UraA (From Topology)	T: Uracil Transporter UraA	F: PF00955	ECOD (1.6)
D	PF07565	e8eeqD1	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: PF07565	ECOD (1.6)
A	PF00955	e8eeqA1	A: alpha complex topology	X: Uracil Transporter UraA (From Topology)	H: Uracil Transporter UraA (From Topology)	T: Uracil Transporter UraA	F: PF00955	ECOD (1.6)
C [auth B]	PF07565	e8eeqB1	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: PF07565	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B [auth C], C [auth B], D	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 [auth C], C [auth B], D	Anion exchange protein	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 bicarbonate transmembrane transporter activity organic anion transmembrane transporter activity monoatomic anion transmembrane transporter activity monoatomic ion transmembrane transporter activity	homeostatic process biological regulation regulation of intracellular pH cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis regulation of pH monoatomic ion homeostasis intracellular chemical homeostasis regulation of biological quality monoatomic cation homeostasis regulation of cellular pH intracellular monoatomic ion homeostasis	cell periphery basal part of cell membrane plasma membrane basal plasma membrane plasma membrane region cellular anatomical entity basolateral plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B [auth C], C [auth B], D	IPR013769	Band 3 cytoplasmic domain	Domain
A, B [auth C], C [auth B], D	IPR016152	Phosphotransferase/anion transporter	Homologous Superfamily
A, B [auth C], C [auth B], D	IPR001717	Anion exchange protein	Family
A, B [auth C], C [auth B], D	IPR011531	Bicarbonate transporter-like, transmembrane domain	Domain
A, B [auth C], C [auth B], D	IPR002977	Anion exchange protein 1	Family
A, B [auth C], C [auth B], D	IPR003020	Bicarbonate transporter, eukaryotic	Family
A, B [auth C], C [auth B], D	IPR018241	Anion exchange, conserved site	Conserved Site

Membrane Protein Annotation: OPM OPM Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B [auth C], C [auth B], D	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Solute Carrier Family 4 (anion exchanger)	Band 3 (AE1) anion exchanger dimer, inward facing-inward facing, TM domain

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.