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Tatum, Rodney,Zhang, Yuguo,Lu, Qun,Kim, Kwonseop,Jeansonne, Beverly G.,Chen, Yan-Hua North-Holland Pub 2007 FEBS letters Vol.581 No.20
<P><B>Abstract</B></P><P>Mutations in WNK4 have been linked to hypertension in PHAII. Paracellular ion transport has been reported to be involved in this disease process; however, the specific molecular target has not been identified. In this study, we found that TJ protein claudin-7 and WNK4 were partially co-localized in renal tubules of rat kidney and co-immunoprecipitated in kidney epithelial cells. The wild-type and PHAII-causing mutant, but not the kinase-dead mutant, phosphorylated claudin-7. We have identified ser<SUP>206</SUP> in the COOH-terminus of claudin-7 as a putative phosphorylation site for WNK4. More importantly, disease-causing mutant enhanced claudin-7 phosphorylation and significantly increased paracellular permeability to Cl<SUP>−</SUP>.</P>