Constitutive regulation of mitochondrial morphology by Aurora A kinase depends on a predicted cryptic targeting sequence at the N-terminus.

Constitutive regulation of mitochondrial morphology by Aurora A kinase depends on a predicted cryptic targeting sequence at the N-terminus.
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DOI:
10.1098/rsob.170272
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发表时间:
2018-06
期刊:
影响因子:
5.8
通讯作者:
Lindon C
Lindon C
中科院分区:
生物学2区
文献类型:
--
作者:
Grant R;Abdelbaki A;Bertoldi A;Gavilan MP;Mansfeld J;Glover DM;Lindon C

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Aurora A激酶(AURKA)是有丝分裂的主要调节因子,也是癌症进展的重要驱动因素。AURKA在有丝分裂之外的作用,以及它们如何促进癌症进展,目前还不清楚。在这里,我们发现细胞质AURKA的一部分与线粒体相关,在细胞提取物中共分离,并通过互反共免疫沉淀与线粒体蛋白相互作用。我们还发现,线粒体网络的动态对AURKA抑制、耗尽或过表达很敏感。这可以解释在RPE-1和U2OS细胞系中观察到的不同线粒体形态,它们显示出非常不同的AURKA表达水平。我们确定AURKA的线粒体部分影响线粒体形态,因为该激酶的n端截断版本不定位于线粒体,不影响线粒体网络。我们在AURKA n端发现了一个隐藏的线粒体靶向序列,并讨论了蛋白质的不同构象如何影响其细胞质命运。
Aurora A kinase (AURKA) is a major regulator of mitosis and an important driver of cancer progression. The roles of AURKA outside of mitosis, and how these might contribute to cancer progression, are not well understood. Here, we show that a fraction of cytoplasmic AURKA is associated with mitochondria, co-fractionating in cell extracts and interacting with mitochondrial proteins by reciprocal co-immunoprecipitation. We have also found that the dynamics of the mitochondrial network are sensitive to AURKA inhibition, depletion or overexpression. This can account for the different mitochondrial morphologies observed in RPE-1 and U2OS cell lines, which show very different levels of expression of AURKA. We identify the mitochondrial fraction of AURKA as influencing mitochondrial morphology, because an N-terminally truncated version of the kinase that does not localize to mitochondria does not affect the mitochondrial network. We identify a cryptic mitochondrial targeting sequence in the AURKA N-terminus and discuss how alternative conformations of the protein may influence its cytoplasmic fate.
人类TPX2是将极光-A激酶靶向纺锤体所必需的。
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