Transcriptional activation of H+/K+-ATPase genes by gastric GATA binding proteins

Journal of Biochemistry
T NishiM Futai

Abstract

H+/K+-ATPase (composed of alpha and beta subunits) and histamine H2 receptor are specifically expressed in gastric parietal cells. The GATA binding proteins (GATA-GT1 and GATA-GT2, also called GATA-6 and GATA-4, respectively) originally found in the gastric mucosa recognized a sequence motif [gastric motif, (G/C)PuPu(G/C)NGAT(A/T)PuPy] in the upstream regions of the ATPase genes [Tamura, S., Wang, X.-H., Maeda, M., and Futai, M. (1993) Proc. Natl. Acad. Sci. USA 90, 10876-10880]. These proteins activated the transcription of the reporter gene ligated downstream of the control region of the rat ATPase alpha or beta subunit gene but had no effect on the same reporter ligated downstream of the H2 receptor gene. Deletion analyses suggested that the upstream 249 (alpha gene) and 323 (beta gene) base pair sequences from the first letter of the initiation codon are sufficient for activation by the GATA proteins. Interestingly, two and three gastric motifs are located near the TATA-boxes of the alpha and beta genes, respectively. Mutagenesis studies demonstrated that the two motifs proximal to the TATA-box sequences of the ATPase alpha and beta subunit genes were essential for the activation. These results suggest that both the alpha a...Continue Reading

Citations

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