The Mitotic Checkpoint Complex Requires an Evolutionary Conserved Cassette to Bind and Inhibit Active APC/C.

The Mitotic Checkpoint Complex Requires an Evolutionary Conserved Cassette to Bind and Inhibit Active APC/C.
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DOI:
10.1016/j.molcel.2016.11.006
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发表时间:
2016-12-15
期刊:
影响因子:
16
通讯作者:
Pines J
Pines J
中科院分区:
生物学1区
文献类型:
--
作者:
Di Fiore B;Wurzenberger C;Davey NE;Pines J

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纺锤体装配检查点 (SAC) 通过防止姐妹染色单体分离直至所有染色体都附着到纺锤体上来确保基因组稳定性。它催化有丝分裂检查点复合物 (MCC) 的产生,从而抑制 Cdc20 以使后期促进复合物/环状体 (APC/C) 失活。在这里,我们展示了最近鉴定的 ABBA 基序类别的 BubR1 中的两个 Cdc20 结合基序对于 MCC 识别活性 APC/C-Cdc20 至关重要。突变这些基序会消除 MCC 与 APC/C 的结合,从而废除 SAC 并防止细胞因微管毒物而停滞。这些 ABBA 基序位于 KEN 盒两侧,形成一个在进化过程中高度保守的盒,无论是 ABBA-KEN-ABBA 基序的排列和间距,还是与形成 MCC 所需的氨基末端 KEN 盒的关联。我们建议 ABBA-KEN-ABBA 盒通过结合 MCC-APC/C 复合物中的两个 Cdc20 分子,将 MCC 固定在 APC/C 上。 BubR1 的 N 端一半包含两个结合 Cdc20 的 ABBA 基序 这些基序是 MCC 结合和抑制活性 APC/C-Cdc20 所必需的 这些 ABBA 基序对于纺锤体组装检查点至关重要 ABBA 基序位于 KEN 盒两侧,形成进化中高度保守的盒 Di Fiore 等人。显示 BubR1 中的两个 ABBA 基序对于纺锤体组装检查点至关重要,因为有丝分裂检查点复合物 (MCC) 需要它们来结合和抑制后期促进复合物/环体 (APC/C)。他们的结果显示了 MCC 如何抑制活性 APC/C。
The Spindle Assembly Checkpoint (SAC) ensures genomic stability by preventing sister chromatid separation until all chromosomes are attached to the spindle. It catalyzes the production of the Mitotic Checkpoint Complex (MCC), which inhibits Cdc20 to inactivate the Anaphase Promoting Complex/Cyclosome (APC/C). Here we show that two Cdc20-binding motifs in BubR1 of the recently identified ABBA motif class are crucial for the MCC to recognize active APC/C-Cdc20. Mutating these motifs eliminates MCC binding to the APC/C, thereby abolishing the SAC and preventing cells from arresting in response to microtubule poisons. These ABBA motifs flank a KEN box to form a cassette that is highly conserved through evolution, both in the arrangement and spacing of the ABBA-KEN-ABBA motifs, and association with the amino-terminal KEN box required to form the MCC. We propose that the ABBA-KEN-ABBA cassette holds the MCC onto the APC/C by binding the two Cdc20 molecules in the MCC-APC/C complex. The N-terminal half of BubR1 contains two ABBA motifs that bind Cdc20 The motifs are required for the MCC to bind and inhibit active APC/C-Cdc20 These ABBA motifs are essential for the spindle assembly checkpoint The ABBA motifs flank a KEN box to form a cassette highly conserved in evolution Di Fiore et al. show that two ABBA motifs in BubR1 are crucial for the Spindle Assembly Checkpoint because they are needed for the Mitotic Checkpoint Complex (MCC) to bind and inhibit the Anaphase Promoting Complex/Cyclosome (APC/C). Their results show how the MCC inhibits active APC/C.
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