Inhibition of the epithelial Na+ channel by interaction of Nedd4 with a PY motif deleted in Liddle's syndrome
Inhibition of the epithelial Na+ channel by interaction of Nedd4 with a PY motif deleted in Liddle's syndrome
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DOI：
10.1074/jbc.273.45.30012
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发表时间：
1998-11-06
影响因子：
4.8
通讯作者：
Snyder, PM
中科院分区：
文献类型：
--
作者：
Goulet, CC;Volk, KA;Snyder, PM
The epithelial Na+ channel (ENaC) plays a critical role in Na+ absorption in the kidney and other epithelia, Mutations in the C terminus of the beta or gamma ENaC subunits increase renal Na+ absorption, causing Liddle's syndrome, an inherited form of hypertension. These mutations delete or disrupt a PY motif that was recently shown to interact with Nedd4, a ubiquitin-protein ligase expressed in epithelia, We found that Nedd4 inhibited ENaC when they were coexpressed in Xenopus oocytes. Liddle's syndrome-associated mutations that prevent the interaction between Nedd4 and ENaC abolished inhibition, suggesting that a direct interaction is required for inhibition by Nedd4. Inhibition also required activity of a ubiquitin ligase domain within the C terminus of Nedd4, Nedd4 had no detectable effect on the single channel properties of ENaC, Rather, Nedd4 decreased cell surface expression of both ENaC and a chimeric protein containing the C terminus of the beta subunit, Decreased surface expression resulted from an increase in the rate of degradation of the channel complex. Thus, interaction of Nedd4 with the C terminus of ENaC inhibits Na+ absorption, and loss of this interaction may play a role in the pathogenesis of Liddle's syndrome and other forms of hypertension.
