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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+Cell+Biol
2016 ; 215
(2
): 151-166
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The ubiquitin ligase CRL2ZYG11 targets cyclin B1 for degradation in a conserved
pathway that facilitates mitotic slippage
#MMPMID27810909
Balachandran RS
; Heighington CS
; Starostina NG
; Anderson JW
; Owen DL
; Vasudevan S
; Kipreos ET
J Cell Biol
2016[Oct]; 215
(2
): 151-166
PMID27810909
show ga
The anaphase-promoting complex/cyclosome (APC/C) ubiquitin ligase is known to
target the degradation of cyclin B1, which is crucial for mitotic progression in
animal cells. In this study, we show that the ubiquitin ligase CRL2(ZYG-11)
redundantly targets the degradation of cyclin B1 in Caenorhabditis elegans and
human cells. In C. elegans, both CRL2(ZYG-11) and APC/C are required for proper
progression through meiotic divisions. In human cells, inactivation of
CRL2(ZYG11A/B) has minimal effects on mitotic progression when APC/C is active.
However, when APC/C is inactivated or cyclin B1 is overexpressed,
CRL2(ZYG11A/B)-mediated degradation of cyclin B1 is required for normal
progression through metaphase. Mitotic cells arrested by the spindle assembly
checkpoint, which inactivates APC/C, often exit mitosis in a process termed
"mitotic slippage," which generates tetraploid cells and limits the effectiveness
of antimitotic chemotherapy drugs. We show that ZYG11A/B subunit knockdown, or
broad cullin-RING ubiquitin ligase inactivation with the small molecule MLN4924,
inhibits mitotic slippage in human cells, suggesting the potential for
antimitotic combination therapy.