The Cul3-KLHL21 E3 ubiquitin ligase targets aurora B to midzone microtubules in anaphase and is required for cytokinesis.

The Cul3-KLHL21 E3 ubiquitin ligase targets aurora B to midzone microtubules in anaphase and is required for cytokinesis.
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DOI:
10.1083/jcb.200906117
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发表时间:
2009-12-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Peter M
Peter M
中科院分区:
其他
文献类型:
--
作者:
Maerki S;Olma MH;Staubli T;Steigemann P;Gerlich DW;Quadroni M;Sumara I;Peter M

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在有丝分裂过程中,不同Cul3接子对Aurora B的选择性泛素化作用在正确的时间将其靶向到正确的位置。基于Cul3 (Cullin3)的E3泛素连接酶最近被发现是有丝分裂的关键调节因子。在这项研究中,我们鉴定了两种哺乳动物BTB (bric -a- braca - tramtrack - broad complex)-Kelch蛋白KLHL21和KLHL22,它们与Cul3相互作用,是有效染色体比对所必需的。有趣的是,KLHL21而非KLHL22是细胞分裂所必需的,并调节染色体客运复合体(CPC)在后期从染色体到纺锤体中间区的易位,类似于先前描述的BTB-Kelch蛋白KLHL9和KLHL13。KLHL21直接结合Aurora B并介导Aurora B的泛素化。与KLHL9和KLHL13不同,KLHL21在后期定位于中间区微管,并将Aurora B和Cul3招募到该区域。总之,我们的研究结果表明,不同的Cul3接头在有丝分裂过程中非冗余地调节极光B,可能是通过在不同的亚细胞位置泛素化不同的极光B池。
Selective ubiquitination of Aurora B by different Cul3 adaptors targets it at the correct time to the correct place during mitosis. Cul3 (Cullin3)-based E3 ubiquitin ligases recently emerged as critical regulators of mitosis. In this study, we identify two mammalian BTB (Bric-a-brac–Tramtrack–Broad complex)-Kelch proteins, KLHL21 and KLHL22, that interact with Cul3 and are required for efficient chromosome alignment. Interestingly, KLHL21 but not KLHL22 is necessary for cytokinesis and regulates translocation of the chromosomal passenger complex (CPC) from chromosomes to the spindle midzone in anaphase, similar to the previously described BTB-Kelch proteins KLHL9 and KLHL13. KLHL21 directly binds to Aurora B and mediates ubiquitination of Aurora B in vitro. In contrast to KLHL9 and KLHL13, KLHL21 localizes to midzone microtubules in anaphase and recruits Aurora B and Cul3 to this region. Together, our results suggest that different Cul3 adaptors nonredundantly regulate Aurora B during mitosis, possibly by ubiquitinating different pools of Aurora B at distinct subcellular localizations.
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