Control of meiotic pairing and recombination by chromosomally tethered 26S proteasome.

Control of meiotic pairing and recombination by chromosomally tethered 26S proteasome.
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DOI:
10.1126/science.aaf4778
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发表时间:
2017-01-27
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Börner GV
Börner GV
中科院分区:
其他
文献类型:
--
作者:
Ahuja JS;Sandhu R;Mainpal R;Lawson C;Henley H;Hunt PA;Yanowitz JL;Börner GV

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在减数分裂过程中,成对的同源染色体(同系物)通过联会复合体(SC)和交换连接在一起。交叉介导同源物分离,并由自身造成的双链断裂(DSB)引起。在这里,我们确定功能同源并列和交叉的蛋白酶体,多亚基蛋白酶,降解蛋白质在细胞核和细胞质。没有蛋白酶体功能,同源物不能配对,而是保持与非同源染色体相关。虽然非交叉形成的功能,蛋白酶体是需要一个协调的过渡,需要SC组装之间的纵向组织的染色体轴和稳定的链交换的交叉指定的DSB。值得注意的是,蛋白水解核心和调节蛋白酶体颗粒被Zip3(哺乳动物E3连接酶RNF212的直向同源物)和SC蛋白Zip1招募到染色体上,作为进化保守程序的一部分。
During meiosis, paired homologous chromosomes (homologues) become linked via the synaptonemal complex (SC) and crossovers. Crossovers mediate homologue segregation and arise from self-inflicted double-strand breaks (DSBs). Here, we identify functions in homologue juxtaposition and crossing over of the proteasome, the multi-subunit protease that degrades proteins in the nucleus and cytoplasm. Without proteasome function, homologues fail to pair and instead remain associated with non-homologous chromosomes. While dispensable for non-crossover formation, a functional proteasome is required for a coordinated transition that entails SC assembly between longitudinally organized chromosome axes and stable strand exchange of crossover-designated DSBs. Remarkably, proteolytic core and regulatory proteasome particles are recruited to chromosomes by Zip3, the orthologue of mammalian E3 ligase RNF212, and SC protein Zip1 as part of an evolutionarily conserved program.
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