RGD Reference Report - Interactions of transmembrane carbonic anhydrase, CAIX, with bicarbonate transporters. - Rat Genome Database

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Interactions of transmembrane carbonic anhydrase, CAIX, with bicarbonate transporters.

Authors: Morgan, PE  Pastorekova, S  Stuart-Tilley, AK  Alper, SL  Casey, JR 
Citation: Morgan PE, etal., Am J Physiol Cell Physiol. 2007 Aug;293(2):C738-48. Epub 2007 Jul 25.
RGD ID: 9999376
Pubmed: PMID:17652430   (View Abstract at PubMed)
DOI: DOI:10.1152/ajpcell.00157.2007   (Journal Full-text)

Association of some plasma membrane bicarbonate transporters with carbonic anhydrase enzymes forms a bicarbonate transport metabolon to facilitate metabolic CO(2)-HCO(3)(-) conversions and coupled HCO(3)(-) transport. The transmembrane carbonic anhydrase, CAIX, with its extracellular catalytic site, is highly expressed in parietal and other cells of gastric mucosa, suggesting a role in acid secretion. We examined in transfected HEK293 cells the functional and physical interactions between CAIX and the parietal cell Cl(-)/HCO(3)(-) exchanger AE2 or the putative Cl(-)/HCO(3)(-) exchanger SLC26A7. Coexpression of CAIX increased AE2 transport activity by 28 +/- 7% and also activated transport mediated by AE1 and AE3 (32 +/- 10 and 37 +/- 9%, respectively). In contrast, despite a transport rate comparable to that of AE3, coexpressed CAIX did not alter transport associated with SLC26A7. The CAIX-associated increase of AE2 activity did not result from altered AE2 expression or cell surface processing. CAIX was coimmunoprecipitated with the coexpressed SLC4 polypeptides AE1, AE2, and AE3, but not with SLC26A7. GST pull-down assays with a series of domain-deleted forms of CAIX revealed that the catalytic domain of CAIX mediated interaction with AE2. AE2 and CAIX colocalized in human gastric mucosa, as indicated by coimmunofluorescence. This is the first example of a functional and physical interaction between a bicarbonate transporter and a transmembrane carbonic anhydrase. We conclude that CAIX can bind to some Cl(-)/HCO(3)(-) exchangers to form a bicarbonate transport metabolon.

Gene Ontology Annotations    Click to see Annotation Detail View

Molecular Function
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
enzyme binding  IPICA9 (Homo sapiens)9999376; 9999376; 9999376 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Slc4a1  (solute carrier family 4 member 1 (Diego blood group))
Slc4a2  (solute carrier family 4 member 2)
Slc4a3  (solute carrier family 4 member 3)


Additional Information