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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+Renal+Physiol
2017 ; 313
(1
): F30-F46
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Identification of ?-catenin-interacting proteins in nuclear fractions of native
rat collecting duct cells
#MMPMID28298358
Hwang JR
; Chou CL
; Medvar B
; Knepper MA
; Jung HJ
Am J Physiol Renal Physiol
2017[Jul]; 313
(1
): F30-F46
PMID28298358
show ga
The gene encoding the aquaporin-2 water channel is regulated transcriptionally in
response to vasopressin. In the renal collecting duct, vasopressin stimulates the
nuclear translocation and phosphorylation (at Ser(552)) of ?-catenin, a
multifunctional protein that acts as a transcriptional coregulator in the
nucleus. The purpose of this study was to identify ?-catenin-interacting proteins
that might be involved in transcriptional regulation in rat inner medullary
collecting duct (IMCD) cells, using experimental and computational approaches. We
used a standard chromatin immunoprecipitation procedure coupled to mass
spectrometry (ChIP-MS) in a nuclear fraction isolated from rat IMCD suspensions.
Over four biological replicates, we reproducibly identified 43 ?-catenin-binding
proteins, including several known ?-catenin-binding partners as well as novel
interacting proteins. Multiple proteins involved in transcriptional regulation
were identified (Taf1, Jup, Tdrd3, Cdh1, Cenpj, and several histones). Many of
the identified ?-catenin-binding partners were found in prior studies to
translocate to the nucleus in response to vasopressin. There was only one
DNA-binding transcription factor (TF), specifically Taf1, part of the
RNA-polymerase II preinitiation complex. To identify sequence-specific TFs that
might interact with ?-catenin, Bayes' theorem was used to integrate data from
several information sources. The analysis identified several TFs with potential
binding sites in the Aqp2 gene promoter that could interact with ?-catenin in the
regulation of Aqp2 gene transcription, specifically Jun, Junb, Jund, Atf1, Atf2,
Mef2d, Usf1, Max, Pou2f1, and Rxra. The findings provide information necessary
for modeling the transcriptional response to vasopressin.