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An evolutionarily conserved N-terminal Sgk1 variant with enhanced stability and improved function.

Nandita S Raikwar¹, Peter M Snyder, Christie P Thomas

¹Department of Internal Medicine, University of Iowa College of Medicine, Iowa City, IA, USA.

American Journal of Physiology. Renal Physiology

|August 30, 2008

Summary

A new variant of serum and glucocorticoid-induced kinase 1 (Sgk1_v2) shows improved stability and enhances epithelial sodium channel (ENaC) activity. This discovery offers potential for improved kidney sodium transport regulation.

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Area of Science:

Molecular Biology
Renal Physiology
Biochemistry

Background:

Serum and glucocorticoid-induced kinase 1 (Sgk1) regulates epithelial sodium channel (ENaC)-mediated sodium transport in the kidney.
The N-terminus of Sgk1 contains instability motifs, leading to rapid ubiquitination and degradation.
Understanding Sgk1 regulation is crucial for kidney sodium homeostasis.

Purpose of the Study:

To identify and characterize a novel variant of Sgk1 with potentially altered stability and function.
To investigate the impact of this Sgk1 variant on ENaC activity and localization.

Main Methods:

Bioinformatic analysis to identify a 5' variant alternate transcript of human Sgk1 (Sgk1_v2).
Expression of Sgk1 and Sgk1_i2 in HEK293 cells and FRT epithelia.
Assessment of protein abundance, ubiquitination, cell surface expression, and amiloride-sensitive sodium transport.

Main Results:

Sgk1_v2 encodes an isoform (Sgk1_i2) with a different N-terminus, exhibiting increased protein half-life and reduced ubiquitination compared to wild-type Sgk1.
Sgk1_i2 demonstrated enhanced surface expression of ENaC and preferential targeting to the plasma membrane.
Coexpression of Sgk1_i2 with ENaC subunits resulted in significantly greater stimulation of amiloride-sensitive sodium transport than Sgk1.

Conclusions:

A conserved N-terminal variant of Sgk1 (Sgk1_i2) possesses improved protein stability and enhanced association with the plasma membrane.
Sgk1_i2 exhibits greater stimulatory effects on epithelial sodium transport compared to wild-type Sgk1 in a heterologous system.
This Sgk1 variant represents a novel regulator of kidney sodium transport with potential therapeutic implications.