GRSF1 regulates RNA processing in mitochondrial RNA granules.
GRSF1 regulates RNA processing in mitochondrial RNA granules.
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DOI:
10.1016/j.cmet.2013.02.005
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发表时间:
2013-03-05
期刊:
影响因子:
29
通讯作者:
Martinou JC
中科院分区:
文献类型:
--
作者:
Jourdain AA;Koppen M;Wydro M;Rodley CD;Lightowlers RN;Chrzanowska-Lightowlers ZM;Martinou JC
Various specialized domains have been described in the cytosol and the nucleus; however, little is known about compartmentalization within the mitochondrial matrix. GRSF1 (G-rich sequence factor 1) is an RNA binding protein that was previously reported to localize in the cytosol. We found that an isoform of GRSF1 accumulates in discrete foci in the mitochondrial matrix. These foci are composed of nascent mitochondrial RNA and also contain RNase P, an enzyme that participates in mitochondrial RNA processing. GRSF1 was found to interact with RNase P and to be required for processing of both classical and tRNA-less RNA precursors. In its absence, cleavage of primary RNA transcripts is abnormal, leading to decreased expression of mitochondrially encoded proteins and mitochondrial dysfunction. Our findings suggest that the foci containing GRSF1 and RNase P correspond to sites where primary RNA transcripts converge to be processed. We have termed these large ribonucleoprotein structures “mitochondrial RNA granules.” ► GRSF1 resides in the mitochondrial matrix and is required for mitochondrial function ► GRSF1 is required for the processing of tRNA-containing and tRNA-lacking precursors ► GRSF1, RNase P, and nascent RNA are part of “mitochondrial RNA granules” ► Mitochondrial RNA granules are functionally linked to RNA processing
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影响因子:
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通讯作者:
Chrzanowska-Lightowlers, Zofia M.
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通讯作者:
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作者:
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通讯作者:
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