Band 3

For the radio frequency range, see Band III.
Solute carrier family 4 (anion exchanger), member 1 (Diego blood group)

Atomic microscope image of Band 3
Available structures
PDB Ortholog search: PDBe, RCSB
Identifiers
Symbols SLC4A1 ; AE1; BND3; CD233; DI; EMPB3; EPB3; FR; RTA1A; SW; WD; WD1; WR
External IDs OMIM: 109270 MGI: 109393 HomoloGene: 133556 GeneCards: SLC4A1 Gene
RNA expression pattern
More reference expression data
Orthologs
Species Human Mouse
Entrez 6521 20533
Ensembl ENSG00000004939 ENSMUSG00000006574
UniProt P02730 P04919
RefSeq (mRNA) NM_000342 NM_011403
RefSeq (protein) NP_000333 NP_035533
Location (UCSC) Chr 17:
44.25 – 44.27 Mb
Chr 11:
102.35 – 102.37 Mb
PubMed search
solute carrier family 4 (anion exchanger), member 1, adapter protein
Identifiers
Symbol SLC4A1AP
Entrez 22950
HUGO 13813
OMIM 602655
RefSeq NM_018158
UniProt P02730
Other data
Locus Chr. 2 p23.3

Band 3 anion transport protein, also known as anion exchanger 1 (AE1) or band 3 or solute carrier family 4 member 1 (SLC4A1), is a protein that is encoded by the SLC4A1 gene in humans.

Band 3 anion transport protein is a phylogenetically-preserved transport protein responsible for mediating the exchange of chloride (Cl) with bicarbonate (HCO3) across plasma membranes. Functionally similar members of the AE clade are AE2 and AE3.[1]

Function

Band 3 is present in the basolateral face of the α-intercalated cells of the collecting ducts of the nephron, which are the main acid-secreting cells of the kidney. They generate hydrogen ions and bicarbonate ions from carbon dioxide and water - a reaction catalysed by carbonic anhydrase. The hydrogen ions are pumped into the collecting duct tubule by vacuolar H+ ATPase, the apical proton pump, which thus excretes acid into the urine. kAE1 exchanges bicarbonate for chloride on the basolateral surface, essentially returning bicarbonate to the blood. Here it performs two functions:

Distribution

It is ubiquitous throughout the vertebrates. In mammals, it is present in two specific sites:

Gene products

The erythrocyte and kidney forms are different isoforms of the same protein.[2]

The erythrocyte isoform of AE1, known as eAE1, is composed of 911 amino acids. eAE1 is an important structural component of the erythrocyte cell membrane, making up to 25% of the cell membrane surface. Each red cell contains approximately one million copies of eAE1.

The kidney isoform of AE1, known as kAE1 (which is 65 amino acids shorter than erythroid AE1) is found in the basolateral membrane of alpha-intercalated cells in the cortical collecting duct of the kidney.

Clinical significance

Mutations of kidney AE1 cause distal (type 1) renal tubular acidosis, which is an inability to acidify the urine, even if the blood is too acidic. These mutations are disease causing as they cause mistargetting of the mutant band 3 proteins so that they are retained within the cell or occasionally addressed to the wrong (i.e. apical) surface.

Mutations of erythroid AE1 affecting the extracellular domains of the molecule may cause alterations in the individual's blood group, as band 3 determines the Diego blood group.

More importantly erythroid AE1 mutations cause 15–25% of cases of Hereditary spherocytosis (a disorder associated with progressive red cell membrane loss), and also cause the hereditary conditions of Hereditary stomatocytosis[3] and Southeast Asian Ovalocytosis[4]

Interactions

Band 3 has been shown to interact with CA2[5][6][7][8] and CA4.[9]

Discovery

AE1 was discovered following SDS-PAGE ( sodium dodecyl sulfate polyacrylamide gel electrophoresis ) of erythrocyte cell membrane. The large 'third' band on the electrophoresis gel represented AE1, which was thus initially termed 'Band 3'.

See also

References

  1. Alper SL (2009). "Molecular physiology and genetics of Na+-independent SLC4 anion exchangers". Journal of Experimental Biology 212 (11): 1672–1683. doi:10.1242/jeb.029454. PMC 2683012. PMID 19448077.
  2. Schlüter K, Drenckhahn D (August 1986). "Co-clustering of denatured hemoglobin with band 3: its role in binding of autoantibodies against band 3 to abnormal and aged erythrocytes". Proc. Natl. Acad. Sci. U.S.A. 83 (16): 6137–41. Bibcode:1986PNAS...83.6137S. doi:10.1073/pnas.83.16.6137. PMC 386454. PMID 3461480.
  3. Bruce LJ, Robinson HC, Guizouarn H, Borgese F, Harrison P, King MJ, Goede JS, Coles SE, Gore DM, Lutz HU, Ficarella R, Layton DM, Iolascon A, Ellory JC, Stewart GW (2005). "Monovalent cation leaks in human red cells caused by single amino-acid substitutions in the transport domain of the band 3 chloride-bicarbonate exchanger, AE1". Nat. Genet. 37 (11): 1258–63. doi:10.1038/ng1656. PMID 16227998.
  4. Jarolim P, Palek J, Amato D, Hassan K, Sapak P, Nurse GT, Rubin HL, Zhai S, Sahr KE, Liu SC (1991). "Deletion in erythrocyte band 3 gene in malaria-resistant Southeast Asian ovalocytosis". Proc. Natl. Acad. Sci. U.S.A. 88 (24): 11022–6. Bibcode:1991PNAS...8811022J. doi:10.1073/pnas.88.24.11022. PMC 53065. PMID 1722314.
  5. Sterling D, Reithmeier RA, Casey JR (Dec 2001). "A transport metabolon. Functional interaction of carbonic anhydrase II and chloride/bicarbonate exchangers". J. Biol. Chem. 276 (51): 47886–94. doi:10.1074/jbc.M105959200 (inactive 2015-01-10). PMID 11606574.
  6. Vince JW, Reithmeier RA (October 1998). "Carbonic anhydrase II binds to the carboxyl terminus of human band 3, the erythrocyte C1-/HCO3- exchanger". J. Biol. Chem. 273 (43): 28430–7. doi:10.1074/jbc.273.43.28430. PMID 9774471.
  7. Vince JW, Carlsson U, Reithmeier RA (November 2000). "Localization of the Cl-/HCO3- anion exchanger binding site to the amino-terminal region of carbonic anhydrase II". Biochemistry 39 (44): 13344–9. doi:10.1021/bi0015111. PMID 11063570.
  8. Vince JW, Reithmeier RA (May 2000). "Identification of the carbonic anhydrase II binding site in the Cl(-)/HCO(3)(-) anion exchanger AE1". Biochemistry 39 (18): 5527–33. doi:10.1021/bi992564p. PMID 10820026.
  9. Sterling D, Alvarez BV, Casey JR (July 2002). "The extracellular component of a transport metabolon. Extracellular loop 4 of the human AE1 Cl-/HCO3- exchanger binds carbonic anhydrase IV". J. Biol. Chem. 277 (28): 25239–46. doi:10.1074/jbc.M202562200. PMID 11994299.

Further reading

  • Tanner MJ (1993). "Molecular and cellular biology of the erythrocyte anion exchanger (AE1)". Semin. Hematol. 30 (1): 34–57. PMID 8434259. 
  • Chambers EJ, Askin D, Bloomberg GB, Ring SM, Tanner MJ (1998). "Studies on the structure of a transmembrane region and a cytoplasmic loop of the human red cell anion exchanger (band 3, AE1)". Biochem. Soc. Trans. 26 (3): 516–20. PMID 9765907. 
  • Inaba M (2002). "[Band 3: expanding knowledge on its functions]". Seikagaku 73 (12): 1431–5. PMID 11831035. 
  • Tanner MJ (2002). "Band 3 anion exchanger and its involvement in erythrocyte and kidney disorders". Curr. Opin. Hematol. 9 (2): 133–9. doi:10.1097/00062752-200203000-00009. PMID 11844997. 
  • Shayakul C, Alper SL (2004). "Defects in processing and trafficking of the AE1 Cl/HCO3 exchanger associated with inherited distal renal tubular acidosis". Clin. Exp. Nephrol. 8 (1): 1–11. doi:10.1007/s10157-003-0271-x. PMID 15067510. 

External links

This article is issued from Wikipedia - version of the Friday, March 18, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.