4YZF | pdb_00004yzf

Crystal structure of the anion exchanger domain of human erythrocyte Band 3

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
D	SCOP2B Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092954	3002647	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092954	3002647	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092954	3002647	SCOP2B (2022-06-29)
A	SCOP2 Family	Sodium-coupled acid-base transporter, SLC4A-like	8092953	4007786	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Nucleobase/cation symporter 2, NCS2-like	8092954	3002647	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
K	e4yzfK2	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
K	e4yzfK1	A: Lipocalins/Streptavidin	X: SAM/DNA-glycosylase	H: SAM domain-like	T: EF-hand_1, EF-hand_6, EF-hand_7	F:	ECOD (20:10:01)
I	e4yzfI1	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
I	e4yzfI2	A: Lipocalins/Streptavidin	X: SAM/DNA-glycosylase	H: SAM domain-like	T: EF-hand_1, EF-hand_6, EF-hand_7	F:	ECOD (20:10:01)
G	e4yzfG2	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
G	e4yzfG3	A: Lipocalins/Streptavidin	X: SAM/DNA-glycosylase	H: SAM domain-like	T: EF-hand_1, EF-hand_6, EF-hand_7	F:	ECOD (20:10:01)
E	e4yzfE1	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
E	e4yzfE2	A: Lipocalins/Streptavidin	X: SAM/DNA-glycosylase	H: SAM domain-like	T: EF-hand_1, EF-hand_6, EF-hand_7	F:	ECOD (20:10:01)
L	e4yzfL1	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
J	e4yzfJ1	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
H	e4yzfH1	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
F	e4yzfF1	A: OB-fold	X: Rubredoxin-related	H: Rubredoxin-related	T: Lip_C	F:	ECOD (20:10:01)
D	e4yzfD1	A: Alpha-beta plaits	X: Pseudouridine synthase	H: Pseudouridine synthase	T: Ribosomal_L13e	F:	ECOD (20:10:01)
C	e4yzfC1	A: Lipocalins/Streptavidin	X: SAM/DNA-glycosylase	H: SAM domain-like	T: NAPRTase	F:	ECOD (20:10:01)
B	e4yzfB1	A: Alpha-beta plaits	X: Pseudouridine synthase	H: Pseudouridine synthase	T: Ribosomal_L13e	F:	ECOD (20:10:01)
A	e4yzfA1	A: Alpha-beta plaits	X: Pseudouridine synthase	H: Pseudouridine synthase	T: Ribosomal_L13e	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
K	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
I	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
L	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
J	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
H	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
E, G, I, K	IgG Fab	VH-CH1	Mus musculus (house mouse)	IGHV8-1101, IGHV8-801, IGHJ201, IGHG2A01, IGHG2A*02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-2A_KAPPA	IMGT (202609-0)
F, H, J, L	IgG Fab	L-KAPPA	Mus musculus (house mouse)	IGKV3-701, IGKJ101, IGKC01, IGKC02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-2A_KAPPA	IMGT (202609-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E, G, I, K	Heavy Chain	IGHV8	-	band 3 anion transport protein	SAbDab (2026-03-13)
F, H, J, L	Light Chain	IGKV3	Kappa	band 3 anion transport protein	SAbDab (2026-03-13)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E, G, I, K	FAB fragment of Immunoglobulin (IgG) molecule	-	-	-
F, H, J, L	FAB fragment of Immunoglobulin (IgG) molecule	-	-	-
A, B, C, D	Band 3 anion transport protein	cytoskeletal protein binding ankyrin binding protein binding binding hemoglobin binding bicarbonate transmembrane transporter activity transporter activity 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 transmembrane transporter activity cytoskeletal protein binding ankyrin binding protein binding binding hemoglobin binding bicarbonate transmembrane transporter activity transporter activity 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 transmembrane transporter activity chloride:bicarbonate antiporter activity monoatomic ion 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 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 to cell periphery cellular localization protein localization to plasma membrane macromolecule localization intracellular protein 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 response to oxygen levels response to abiotic stimulus response to increased oxygen levels pH elevation regulation of pH monoatomic cation homeostasis ribonucleotide catabolic process pyridine nucleotide catabolic process aerobic respiration regulation of cellular process negative regulation of small molecule metabolic process negative regulation of glycolytic process oxoacid metabolic process negative regulation of biological 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 negative regulation of ATP metabolic process regulation of primary metabolic process regulation of ATP metabolic process nucleobase-containing compound metabolic process regulation of purine nucleotide catabolic process negative regulation of nucleotide metabolic process regulation of small molecule metabolic process glycolytic process regulation of nucleotide metabolic process phosphate-containing compound metabolic process pyridine-containing compound metabolic process small molecule metabolic process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process purine ribonucleotide catabolic process phosphorus metabolic process negative regulation of carbohydrate metabolic process nucleoside phosphate metabolic process nicotinamide nucleotide metabolic process pyruvate metabolic process regulation of carbohydrate catabolic process regulation of biological 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 nucleotide metabolic process regulation of purine nucleotide metabolic process nucleobase-containing compound catabolic process nucleoside diphosphate metabolic process purine nucleoside diphosphate catabolic process nucleoside diphosphate catabolic process regulation of nucleotide catabolic process metabolic process regulation of phosphorus metabolic process nucleoside triphosphate metabolic process monocarboxylic acid metabolic process purine ribonucleotide metabolic process regulation of metabolic process pyridine-containing compound catabolic process ribose phosphate metabolic process cellular respiration catabolic process ATP metabolic process negative regulation of purine nucleotide metabolic process energy derivation by oxidation of organic compounds negative regulation of phosphate metabolic process purine nucleotide metabolic process ribonucleotide metabolic process nucleobase-containing small molecule metabolic process purine ribonucleoside triphosphate metabolic process negative regulation of cellular process ribonucleoside diphosphate metabolic process ribonucleoside diphosphate catabolic process regulation of carbohydrate metabolic process nucleotide catabolic process negative regulation of nucleotide catabolic process negative regulation of catabolic process purine nucleoside triphosphate metabolic process purine nucleotide catabolic process carbohydrate metabolic process carbohydrate derivative catabolic process regulation of glycolytic process through fructose-6-phosphate ADP catabolic process carboxylic acid metabolic process regulation of catabolic process generation of precursor metabolites and energy regulation of glycolytic process purine-containing compound metabolic process ADP metabolic process organophosphate 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 glycolytic process through fructose-6-phosphate regulation of intracellular pH intracellular monoatomic cation homeostasis regulation of cellular pH	cellular anatomical structure membrane intracellular anatomical structure intracellular membraneless organelle Z disc sarcomere intracellular organelle I band organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril cellular anatomical structure membrane intracellular anatomical structure intracellular membraneless organelle Z disc sarcomere intracellular organelle I band organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex 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

InterPro: Protein Family Classification InterPro Database Homepage

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

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B, C, D	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

Membrane Protein Annotation: OPM OPM Database Homepage

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

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B, C, D	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Solute Carrier Family 4 (anion exchanger)	Erythrocyte Band 3 anion exchanger

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.

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