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2014 ; 13
(11
): 1727-36
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Phosphorylation-mediated stabilization of Bora in mitosis coordinates Plx1/Plk1
and Cdk1 oscillations
#MMPMID24675888
Feine O
; Hukasova E
; Bruinsma W
; Freire R
; Fainsod A
; Gannon J
; Mahbubani HM
; Lindqvist A
; Brandeis M
Cell Cycle
2014[]; 13
(11
): 1727-36
PMID24675888
show ga
Cdk1 and Plk1/Plx1 activation leads to their inactivation through negative
feedback loops. Cdk1 deactivates itself by activating the APC/C, consequently
generating embryonic cell cycle oscillations. APC/C inhibition by the mitotic
checkpoint in somatic cells and the cytostatic factor (CSF) in oocytes sustain
the mitotic state. Plk1/Plx1 targets its co-activator Bora for degradation, but
it remains unclear how embryonic oscillations in Plx1 activity are generated, and
how Plk1/Plx1 activity is sustained during mitosis. We show that Plx1-mediated
degradation of Bora in interphase generates oscillations in Plx1 activity and is
essential for development. In CSF extracts, phosphorylation of Bora on the Cdk
consensus site T52 blocks Bora degradation. Upon fertilization, Calcineurin
dephosphorylates T52, triggering Plx1 oscillations. Similarly, we find that
GFP-Bora is degraded when Plk1 activity spreads to somatic cell cytoplasm before
mitosis. Interestingly, GFP-Bora degradation stops upon mitotic entry when Cdk1
activity is high. We hypothesize that Cdk1 controls Bora through an incoherent
feedforward loop synchronizing the activities of mitotic kinases.