Annotations: 8EEQ

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	HCO3_cotransp	e8eeqA1	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 C]	HCO3_cotransp	e8eeqC1	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)
C [auth B]	Band_3_cyto	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: Band_3_cyto	ECOD (1.6)
D	Band_3_cyto	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: Band_3_cyto	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 monoatomic anion transmembrane transporter activity monoatomic ion transmembrane transporter activity	-	cell periphery cellular anatomical structure plasma membrane 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 R01GM157729.