Roles of gastric GATA DNA-binding proteins - PubMed (original) (raw)
Review
. 1996 Mar;199(Pt 3):513-20.
doi: 10.1242/jeb.199.3.513.
Affiliations
- PMID: 8867276
- DOI: 10.1242/jeb.199.3.513
Review
Roles of gastric GATA DNA-binding proteins
M Maeda et al. J Exp Biol. 1996 Mar.
Abstract
The gastric H+/K(+)-ATPase is a P-type ATPase that is specifically expressed in gastric parietal cells and is responsible for acid secretion into the stomach. We have found one or more gastric mucosal nuclear proteins that recognize a sequence motif in the 5'-upstream regions of the H+/K(+)-ATPase alpha- and beta-subunit genes. This gastric motif, (G/C)PuPu(G/C)NGAT(A/T)PuPy, may be a binding site for a positive transcriptional regulator that functions specifically in parietal cells. We further demonstrated using cDNA cloning and in situ hybridization that novel zinc-finger proteins (GATA-GT1 and GATA-GT2) are present in the gastric parietal cells and bind to this motif. The proteins activate the transcription of the reporter gene with the 5'-upstream region of the H+/K(+)-ATPase beta-subunit gene. These results suggest that gastric GATA DNA-binding proteins have important roles in transcriptional activation of H+/K(+)-ATPase genes in the parietal cells.
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