Mitochondria Export Sulfur Species Required for Cytosolic tRNA Thiolation.

Mitochondria Export Sulfur Species Required for Cytosolic tRNA Thiolation.
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线粒体输出胞质 tRNA 硫醇化所需的硫物质。

DOI:
10.1016/j.chembiol.2018.04.002
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发表时间:
2018
影响因子:
8.6
通讯作者:
Pain,Debkumar
Pain,Debkumar
中科院分区:
生物学1区
文献类型:
--
作者:
Pandey,Alok;Pain,Jayashree;Dziuba,Nathaniel;Pandey,AshutoshK;Dancis,Andrew;Lindahl,PaulA;Pain,Debkumar

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在真核生物中,线粒体已被假设为产生细胞质中tRNA硫醇化所需的硫物质,尽管迄今为止还没有直接的证据。在这里,我们已经检测到这些硫物质,利用我们的观察,单独的酵母细胞质不能硫醇化tRNA,但可以这样做时,添加线粒体。线粒体被发现利用半胱氨酸脱硫酶Nfs 1产生含硫物质的质量范围从700至1,100 Da。线粒体出口这些物质通过内膜中的Atm 1转运蛋白。一旦输出到细胞质,这些硫物质促进细胞质tRNA硫醇化,而不需要线粒体。此外,我们发现,Isu 1/2支架,但不是Ssq 1伴侣的线粒体铁硫簇机器所需的细胞质tRNA巯基化,因此硫利用途径分叉Isu 1/2网站的细胞器内使用线粒体或出口到胞质溶胶。
In eukaryotes, mitochondria have been hypothesized to generate sulfur species required for tRNA thiolation in the cytosol, although no direct evidence thus far exists. Here we have detected these sulfur species, making use of our observation that isolated yeast cytosol alone is unable to thiolate tRNAs but can do so upon addition of mitochondria. Mitochondria were found to utilize the cysteine desulfurase Nfs1 to produce sulfur-containing species with masses ranging from 700 to 1,100 Da. Mitochondria exported these species via the Atm1 transporter in the inner membrane. Once exported to the cytosol, these sulfur species promoted cytosolic tRNA thiolation with no further requirement of mitochondria. Furthermore, we found that the Isu1/2 scaffolds but not the Ssq1 chaperone of the mitochondrial iron-sulfur cluster machinery were required for cytosolic tRNA thiolation, and thus the sulfur utilization pathway bifurcates at the Isu1/2 site for intra-organellar use in mitochondria or export to the cytosol.
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