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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(25
): 17680-8
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English Wikipedia
A novel Ste20-related proline/alanine-rich kinase (SPAK)-independent pathway
involving calcium-binding protein 39 (Cab39) and serine threonine kinase with no
lysine member 4 (WNK4) in the activation of Na-K-Cl cotransporters
#MMPMID24811174
Ponce-Coria J
; Markadieu N
; Austin TM
; Flammang L
; Rios K
; Welling PA
; Delpire E
J Biol Chem
2014[Jun]; 289
(25
): 17680-8
PMID24811174
show ga
Na(+)-dependent chloride cotransporters (NKCC1, NKCC2, and NCC) are activated by
phosphorylation to play critical roles in diverse physiological responses,
including renal salt balance, hearing, epithelial fluid secretion, and volume
regulation. Serine threonine kinase WNK4 (With No K = lysine member 4) and
members of the Ste20 kinase family, namely SPAK and OSR1 (Ste20-related
proline/alanine-rich kinase, Oxidative stress-responsive kinase) govern
phosphorylation. According to present understanding, WNK4 phosphorylates key
residues within SPAK/OSR1 leading to kinase activation, allowing SPAK/OSR1 to
bind to and phosphorylate NKCC1, NKCC2, and NCC. Recently, the calcium-binding
protein 39 (Cab39) has emerged as a binding partner and enhancer of SPAK/OSR1
activity, facilitating kinase autoactivation and promoting phosphorylation of the
cotransporters. In the present study, we provide evidence showing that Cab39
differentially interacts with WNK4 and SPAK/OSR1 to switch the classic two kinase
cascade into a signal kinase transduction mechanism. We found that WNK4 in
association with Cab39 activates NKCC1 in a SPAK/OSR1-independent manner. We
discovered that WNK4 possesses a domain that bears close resemblance to the
SPAK/OSR1 C-terminal CCT/PF2 domain, which is required for physical interaction
between the Ste20 kinases and the Na(+)-driven chloride cotransporters. Modeling,
yeast two-hybrid, and functional data reveal that this PF2-like domain located
downstream of the catalytic domain in WNK4 promotes the direct interaction
between the kinase and NKCC1. We conclude that in addition to SPAK and OSR1, WNK4
is able to anchor itself to the N-terminal domain of NKCC1 and to promote
cotransporter activation.