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. 1991 Mar 1;274(Pt 2):401–404. doi: 10.1042/bj2740401

Nucleoside triphosphates promote the transformation of Ah receptor to its DNA-binding form.

A J Cary 1, J J Dougherty 1
PMCID: PMC1150151  PMID: 1848756

Abstract

When it is bound to a specific ligand such as 2,3,7,8-tetrachlorodibenzo-p-dioxin, mild heating can convert the Ah (aryl hydrocarbon) receptor into a form capable of binding DNA. We found that physiological (1-3 mM) levels of ATP substantially increased the transformation of the receptor to its DNA-binding form. GTP, UTP and CTP had similar effects. ADP also promoted this transformation, but was less effective than ATP at low concentrations. Pyrophosphate too promoted transformation, but AMP had little effect. The process did not require nucleotide hydrolysis, since non-hydrolysable analogues of ATP such as adenosine 5'-[beta gamma-imido]triphosphate were nearly as effective as ATP itself. Inhibitors of ATP-stimulated proteases did not significantly affect the ability of ATP to promote receptor transformation, which suggests that the effect of ATP was not mediated by these proteases.

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Selected References

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