TEFM (c17orf42) is necessary for transcription of human mtDNA.

TEFM (c17orf42) is necessary for transcription of human mtDNA.
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DOI:
10.1093/nar/gkq1224
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发表时间:
2011-05
影响因子:
14.9
通讯作者:
Holt IJ
Holt IJ
中科院分区:
生物学2区
文献类型:
--
作者:
Minczuk M;He J;Duch AM;Ettema TJ;Chlebowski A;Dzionek K;Nijtmans LG;Huynen MA;Holt IJ

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在这里,我们表明,c17 orf 42,以下TEFM(线粒体转录延长因子),使线粒体转录的关键贡献。通过RNA干扰使细胞中的TEFM失活导致呼吸功能不全,这是由于H-和L-链启动子-远端线粒体转录物的水平降低。从人线粒体中亲和纯化TEFM产生了包含线粒体转录物、线粒体RNA聚合酶(POLRMT)、五肽重复结构域3蛋白(PTCD 3)和推定的DEAD盒RNA解旋酶DHX 30的复合物。RNase处理后,只有POLRMT仍然与TEFM,并在人类培养的细胞TEFM形成灶符合新合成的线粒体RNA。基于缺失突变体,TEFM与POLRMT的催化区域相互作用,并且体外TEFM增强了POLRMT对ss-和dsDNA模板的持续合成能力。TEFM含有两个HhH基序和一个核糖核酸酶H折叠,类似于核转录延伸调节因子Spt 6。这些发现使我们提出,TEFM是一个线粒体转录延伸因子。
Here we show that c17orf42, hereafter TEFM (transcription elongation factor of mitochondria), makes a critical contribution to mitochondrial transcription. Inactivation of TEFM in cells by RNA interference results in respiratory incompetence owing to decreased levels of H- and L-strand promoter-distal mitochondrial transcripts. Affinity purification of TEFM from human mitochondria yielded a complex comprising mitochondrial transcripts, mitochondrial RNA polymerase (POLRMT), pentatricopeptide repeat domain 3 protein (PTCD3), and a putative DEAD-box RNA helicase, DHX30. After RNase treatment only POLRMT remained associated with TEFM, and in human cultured cells TEFM formed foci coincident with newly synthesized mitochondrial RNA. Based on deletion mutants, TEFM interacts with the catalytic region of POLRMT, and in vitro TEFM enhanced POLRMT processivity on ss- and dsDNA templates. TEFM contains two HhH motifs and a Ribonuclease H fold, similar to the nuclear transcription elongation regulator Spt6. These findings lead us to propose that TEFM is a mitochondrial transcription elongation factor.
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