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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 Am+J+Physiol+Cell+Physiol
2014 ; 307
(2
): C123-39
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Use of LC-MS/MS and Bayes theorem to identify protein kinases that phosphorylate
aquaporin-2 at Ser256
#MMPMID24598363
Bradford D
; Raghuram V
; Wilson JL
; Chou CL
; Hoffert JD
; Knepper MA
; Pisitkun T
Am J Physiol Cell Physiol
2014[Jul]; 307
(2
): C123-39
PMID24598363
show ga
In the renal collecting duct, binding of AVP to the V2 receptor triggers
signaling changes that regulate osmotic water transport. Short-term regulation of
water transport is dependent on vasopressin-induced phosphorylation of
aquaporin-2 (AQP2) at Ser256. The protein kinase that phosphorylates this site is
not known. We use Bayes' theorem to rank all 521 rat protein kinases with regard
to the likelihood of a role in Ser256 phosphorylation on the basis of prior data
and new experimental data. First, prior probabilities were estimated from
previous transcriptomic and proteomic profiling data, kinase substrate
specificity data, and evidence for kinase regulation by vasopressin. This ranking
was updated using new experimental data describing the effects of several
small-molecule kinase inhibitors with known inhibitory spectra (H-89, KN-62,
KN-93, and GSK-650394) on AQP2 phosphorylation at Ser256 in inner medullary
collecting duct suspensions. The top-ranked kinase was Ca2+/calmodulin-dependent
protein kinase II (CAMK2), followed by protein kinase A (PKA) and protein kinase
B (AKT). Liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based in vitro
phosphorylation studies compared the ability of three highly ranked kinases to
phosphorylate AQP2 and other inner medullary collecting duct proteins, PKA,
CAMK2, and serum/glucocorticoid-regulated kinase (SGK). All three proved capable
of phosphorylating AQP2 at Ser256, although CAMK2 and PKA were more potent than
SGK. The in vitro phosphorylation experiments also identified candidate protein
kinases for several additional phosphoproteins with likely roles in collecting
duct regulation, including Nedd4-2, Map4k4, and 3-phosphoinositide-dependent
protein kinase 1. We conclude that Bayes' theorem is an effective means of
integrating data from multiple data sets in physiology.