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PLoS Genet:SPOP突变前列腺癌中,INF2调控的线粒体分裂异常调节

2017-04-30 AlexYang MedSci原创

前列腺癌外显子组和基因组的下一代测序鉴定了大量的遗传变异位点。SPOP(斑点型POZ蛋白)是初级前列腺癌中最经常发生突变的基因之一,表明了SPOP是一个前列腺癌发生和发展的潜在驱使因子。然而,SPOP图片怎样导致前列腺癌的发病机理仍旧所知甚少。SPOP可以作为CUL3-RBX1 E3泛素连接酶复合物的接头蛋白并且可以招募泛素化底物以便随后的降解。内质网定位的甲酸精蛋白倒甲酸精2(INF2)可以调控

前列腺癌外显子组和基因组的下一代测序鉴定了大量的遗传变异位点。SPOP(斑点型POZ蛋白)是初级前列腺癌中最经常发生突变的基因之一,表明了SPOP是一个前列腺癌发生和发展的潜在驱使因子。然而,SPOP图片怎样导致前列腺癌的发病机理仍旧所知甚少。SPOP可以作为CUL3-RBX1 E3泛素连接酶复合物的接头蛋白并且可以招募泛素化底物以便随后的降解。内质网定位的甲酸精蛋白倒甲酸精2(INF2)可以调控内质网线粒体交叉点肌动蛋白聚合和促进DRP1招募到线粒体,这是线粒体分裂的一个重要步骤。

最近,研究人员阐释了SPOP可以识别INF2碳末端的一个Ser/Thr (S/T)富集的区域并且可以激发INF2的非典型多聚泛素化。这些泛素化修饰不导致INF2的不稳定,但是可以减少INF2在内质网上的定位和线粒体相关的DRP1斑点的形成,从而取消了SPOP促进线粒体分裂的能力。SPOP调控的泛素化中,INF2的突变逃逸可以促进线粒体的分裂。更多的是,前列腺癌相关的SPOP突变增加了INF2在内质网上的定位并且可以促进线粒体分裂,很可能是通过抑制内生性SPOP的显著抑制效应实现的。另外,INF2在SPOP去激活诱导的前列腺癌细胞移植和侵入中具有重要的作用。最后,研究人员指出,这些发现阐释了新的分子事件,阐明了INF2功能的调控和定位,并且加深了在前列腺癌中,SPOP突变和线粒体动态调节异常关系的理解。

原始出处:

Jin X, Wang J, Gao K et al. Dysregulation of INF2-mediated mitochondrial fission in SPOP-mutated prostate cancer. PLoS Genet. 27 April 2017.

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    2018-03-22 canlab
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    2017-12-31 cy0324
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