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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 PLoS+One
2016 ; 11
(4
): e0154263
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USP7 and TDP-43: Pleiotropic Regulation of Cryptochrome Protein Stability Paces
the Oscillation of the Mammalian Circadian Clock
#MMPMID27123980
Hirano A
; Nakagawa T
; Yoshitane H
; Oyama M
; Kozuka-Hata H
; Lanjakornsiripan D
; Fukada Y
PLoS One
2016[]; 11
(4
): e0154263
PMID27123980
show ga
Mammalian Cryptochromes, CRY1 and CRY2, function as principal regulators of a
transcription-translation-based negative feedback loop underlying the mammalian
circadian clockwork. An F-box protein, FBXL3, promotes ubiquitination and
degradation of CRYs, while FBXL21, the closest paralog of FBXL3, ubiquitinates
CRYs but leads to stabilization of CRYs. Fbxl3 knockout extremely lengthened the
circadian period, and deletion of Fbxl21 gene in Fbxl3-deficient mice partially
rescued the period-lengthening phenotype, suggesting a key role of CRY protein
stability for maintenance of the circadian periodicity. Here, we employed a
proteomics strategy to explore regulators for the protein stability of CRYs. We
found that ubiquitin-specific protease 7 (USP7 also known as HAUSP) associates
with CRY1 and CRY2 and stabilizes CRYs through deubiquitination. Treatment with
USP7-specific inhibitor or Usp7 knockdown shortened the circadian period of the
cellular rhythm. We identified another CRYs-interacting protein, TAR DNA binding
protein 43 (TDP-43), an RNA-binding protein. TDP-43 stabilized CRY1 and CRY2, and
its knockdown also shortened the circadian period in cultured cells. The present
study identified USP7 and TDP-43 as the regulators of CRY1 and CRY2, underscoring
the significance of the stability control process of CRY proteins for period
determination in the mammalian circadian clockwork.