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2017 ; 28
(13
): 1754-1767
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Phosphorylation of NHE3-S(719) regulates NHE3 activity through the formation of
multiple signaling complexes
#MMPMID28495796
Sarker R
; Cha B
; Kovbasnjuk O
; Cole R
; Gabelli S
; Tse CM
; Donowitz M
Mol Biol Cell
2017[Jul]; 28
(13
): 1754-1767
PMID28495796
show ga
Casein kinase 2 (CK2) binds to the NHE3 C-terminus and constitutively
phosphorylates a downstream site (S719) that accounts for 40% of basal NHE3
activity. The role of CK2 in regulation of NHE3 activity in polarized Caco-2/bbe
cells was further examined by mutation of NHE3-S(719) to A (not phosphorylated)
or D (phosphomimetic). NHE3-S719A but not -S719D had multiple changes in NHE3
activity: 1) reduced basal NHE3 activity-specifically, inhibition of the
PI3K/AKT-dependent component; 2) reduced acute stimulation of NHE3 activity by
LPA/LPA(5)R stimulation; and 3) reduced acute inhibition of NHE3
activity-specifically, elevated Ca(2+) related (carbachol/Ca(2+) ionophore), but
there was normal inhibition by forskolin and hyperosmolarity. The S719A mutant
had reduced NHE3 complex size, reduced expression in lipid rafts, increased BB
mobile fraction, and reduced binding to multiple proteins that bind throughout
the NHE3 intracellular C-terminus, including calcineurin homologous protein, the
NHERF family and SNX27 (related PDZ domains). These studies show that
phosphorylation of the NHE3 at a single amino acid in the distal part of the
C-terminus affects multiple aspects of NHE3 complex formation and changes the
NHE3 lipid raft distribution, which cause changes in specific aspects of basal as
well as acutely stimulated and inhibited Na(+)/H(+) exchange activity.