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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+Am+Soc+Nephrol
2017 ; 28
(3
): 837-851
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Synaptopodin Is a Coincidence Detector of Tyrosine versus Serine/Threonine
Phosphorylation for the Modulation of Rho Protein Crosstalk in Podocytes
#MMPMID27628902
Buvall L
; Wallentin H
; Sieber J
; Andreeva S
; Choi HY
; Mundel P
; Greka A
J Am Soc Nephrol
2017[Mar]; 28
(3
): 837-851
PMID27628902
show ga
Tyrosine and serine/threonine signal-transduction pathways influence many aspects
of cell behavior, including the spatial and temporal regulation of the actin
cytoskeleton. However, little is known about how input from diverse tyrosine and
serine/threonine kinases is integrated to control Rho protein crosstalk and actin
remodeling, which are critically important in podocyte health and disease. Here
we unveil the proteolytically-regulated, actin organizing protein synaptopodin as
a coincidence detector of tyrosine versus serine/threonine phosphorylation. We
show that serine/threonine and tyrosine kinases duel for synaptopodin stability
versus degradation. EGFR/Src-mediated tyrosine phosphorylation of synaptopodin in
podocytes promotes binding to the serine/threonine phosphatase calcineurin. This
leads to the loss of 14-3-3 binding, resulting in synaptopodin degradation, Vav2
activation, enhanced Rac1 signaling, and ultimate loss of stress fibers. Our
studies reveal how synaptopodin, a single proteolytically-controlled protein,
integrates antagonistic tyrosine versus serine/threonine phosphorylation events
for the dynamic control of the actin cytoskeleton in podocytes.