The Cytosolic Iron-Sulfur Cluster Assembly Protein MMS19 Regulates Transcriptional Gene Silencing, DNA Repair, and Flowering Time in Arabidopsis.

The Cytosolic Iron-Sulfur Cluster Assembly Protein MMS19 Regulates Transcriptional Gene Silencing, DNA Repair, and Flowering Time in Arabidopsis.
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DOI:
10.1371/journal.pone.0129137
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
He XJ
He XJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Han YF;Huang HW;Li L;Cai T;Chen S;He XJ

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MMS 19是真菌和哺乳动物细胞质铁硫(Fe-S)簇组装复合物的重要组成部分; MMS 19无效突变等位基因是致命的。我们的研究表明,MMS 19/MET 18在拟南芥与细胞质的Fe-S簇组装复合物相互作用,但不是一个必不可少的组成部分的复杂。我们发现MMS 19还与DNA聚合酶的催化亚基相互作用,这些亚基已被证明参与转录基因沉默(TGS),DNA修复和开花时间调节。我们的研究结果表明,MMS 19具有相似的生物学功能,提示MMS 19和DNA聚合酶之间存在功能联系。在mms 19无效突变体中,DNA聚合酶α催化亚基上的Fe-S簇组装减少但未被阻断,这与突变体的活力一致。我们的研究表明,MMS 19协助组装的Fe-S集群的DNA聚合酶在胞质溶胶中,从而促进转录基因沉默,DNA修复,开花时间控制。
MMS19 is an essential component of the cytoplasmic iron-sulfur (Fe-S) cluster assembly complex in fungi and mammals; the mms19 null mutant alleles are lethal. Our study demonstrates that MMS19/MET18 in Arabidopsis thaliana interacts with the cytoplasmic Fe-S cluster assembly complex but is not an essential component of the complex. We find that MMS19 also interacts with the catalytic subunits of DNA polymerases, which have been demonstrated to be involved in transcriptional gene silencing (TGS), DNA repair, and flowering time regulation. Our results indicate that MMS19 has a similar biological function, suggesting a functional link between MMS19 and DNA polymerases. In the mms19 null mutant, the assembly of Fe-S clusters on the catalytic subunit of DNA polymerase α is reduced but not blocked, which is consistent with the viability of the mutant. Our study suggests that MMS19 assists the assembly of Fe-S clusters on DNA polymerases in the cytosol, thereby facilitating transcriptional gene silencing, DNA repair, and flowering time control.
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