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Apparent affinity of CFTR for ATP is increased by continuous kinase activity

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Szellas,  Tanjef
Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Nagel,  Georg
Department of Biophysical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Zitation

Szellas, T., & Nagel, G. (2003). Apparent affinity of CFTR for ATP is increased by continuous kinase activity. FEBS Letters, 535(1-3), 141-146. doi:10.1016/s0014-5793(02)03892-9.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0024-DBE0-9
Zusammenfassung
The cystic fibrosis transmembrane conductance regulator (CFTR) is a chloride channel which is activated by protein phosphorylation and nucleoside triphosphates. We demonstrate here that fusion of the soluble catalytic subunit of cAMP-dependent protein kinase to the membrane protein bacteriorhodopsin yields a constitutively active protein kinase which activates CFTR effectively. As it is membrane-bound it is particularly useful for continuous perfusion of excised inside-out patches. We also tested the effect of a naturally membrane-bound protein kinase, cGMP-dependent protein kinase II, on CFTR. Both kinases, when continuously active, increase apparent affinity of CFTR to ATP about two-fold emphasizing the role of phosphorylation in modulating the interaction of ATP with the nucleotide binding domains.