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Phosphorylation

Na+/H+ exchanger studied, phosphorylation process clarified

Published in Drug Week, September 9th, 2005

A study from the United States has reported on the use of phospho-specific antibodies to determine the phosphorylation of endogenous Na+/H+ exchanger type 3 (NHE3) at protein kinase A (PKA) consensus sites.

"Transfection studies using mutant constructs have implicated one or both PKA consensus phosphorylation sites [Ser-552 and -605 in rat NHE3] as critical for mediating inhibition of NHE3 in response to several stimuli including dopamine. However, whether one or both of these sites is actually phosphorylated in endogenous NHE3 in proximal tubule cells is unknown," wrote H.S. Kocinsky and colleagues, Yale University.

"The...

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