期刊
CELL CYCLE
卷 4, 期 11, 页码 1558-1560出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/cc.4.11.2145
关键词
anaphase promoting complex; cyclosome; Pds1; securin; separase; proteasome; centromere cohesion; VELCADE (R)
类别
资金
- NCI NIH HHS [CA099033, CA095914] Funding Source: Medline
Loss of centromere cohesion during anaphase in human cells is regulated by the spindle assembly checkpoint and is thought to depend on a ubiquitin ligase, the Anaphase Promoting Complex/Cyclosome (APC). APC-Cdc20 adds ubiquitin chains to securin inducing its destruction by the proteasome and these events correlate with the loss of sister chromatid cohesion and the onset of anaphase. But whether securin destruction is necessary and sufficient for anaphase initiation is not clear. Therefore, we asked if proteasome activity is needed for anaphase onset in human cells that lack securin. We find that even in the absence of securin, a metaphase block with cohered sister centromeres can be enforced in the absence of proteasome activity. Therefore, other targets of the proteasome must be degraded to allow anaphase onset.
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