Journal article
Regulation of the delta and alpha epithelial sodium channel (ENaC) by ubiquitination and Nedd8
Journal of cellular physiology, Vol.228(11), pp.2190-2201
11/2013
DOI: 10.1002/jcp.24390
PMID: 23589227
Abstract
The δ epithelial sodium channel (δENaC) is a proton‐activated, sodium‐selective, amiloride‐sensitive ion channel in the ENaC/degenerin family of ion channels involved in blood pressure regulation and mechanosensation. Other ENaC family members are subject to ubiquitin modification leading to internalization from the cell surface, and degradation of the channel. Here, we show that δENaC is also modified by ubiquitin on three intracellular lysine residues. Absence of these lysines abolished ubiquitin modification of δENaC and increased cell surface levels of δENaC. Although the HECT‐domain ubiquitin ligase Nedd4‐2 reduced amiloride‐sensitive current generated by δβγENaC‐containing channels, δENaC does not contain a binding site for Nedd4‐2; therefore, this effect is probably mediated by the βγENaC subunits. Nedd8, a ubiquitin‐like protein that regulates RING‐domain E3 ubiquitin ligases, promoted δENaC ubiquitination, decreased both the intracellular and cell surface δENaC populations, and decreased δβγENaC amiloride‐sensitive short circuit current (Isc‐amiloride) in a mammalian epithelium. Nedd8 also promoted α− and γENaC ubiquitination, decreased the cell surface pools, and decreased αβγENaC Isc‐amiloride. Conversely, XIAP, a single subunit RING E3 ligase, decreased ubiquitinated δENaC, increased the δENaC cell surface pool and increased δβγENaC Isc‐amiloride. Therefore δ− and α − βγENaC channel function may be influenced by RING‐domain E3 ubiquitin ligases. J. Cell. Physiol. 228: 2190–2201, 2013. © 2013 Wiley Periodicals, Inc.
Details
- Title: Subtitle
- Regulation of the delta and alpha epithelial sodium channel (ENaC) by ubiquitination and Nedd8
- Creators
- Kevin Ly - University of OtagoC. Joy McIntosh - Victoria University of WellingtonWolfgang Biasio - University of OtagoYongfeng Liu - University of OtagoYing Ke - University of OtagoDiane R Olson - University of Iowa Carver College of MedicineJohn H Miller - Victoria University of WellingtonRachel Page - College of Health, Massey UniversityPeter M Snyder - University of Iowa Carver College of MedicineFiona J McDonald - University of Otago
- Resource Type
- Journal article
- Publication Details
- Journal of cellular physiology, Vol.228(11), pp.2190-2201
- DOI
- 10.1002/jcp.24390
- PMID
- 23589227
- ISSN
- 0021-9541
- eISSN
- 1097-4652
- Number of pages
- 12
- Grant note
- Wellington Medical Research Foundation (2003/67) Dunedin Company of Physiologists University of Otago Research Grant (200100520) Marsden Fund Council from Government Funding Administered by the Royal Society of New Zealand (UO0919)
- Language
- English
- Date published
- 11/2013
- Academic Unit
- Molecular Physiology and Biophysics; Cardiovascular Medicine; Medicine Administration; Internal Medicine
- Record Identifier
- 9984025576002771
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