Suppressor analysis of mutations in the 5'-untranslated region of COB mRNA identifies components of general pathways for mitochondrial mRNA processing and decay in Saccharomyces cerevisiae.

Suppressor analysis of mutations in the 5'-untranslated region of COB mRNA identifies components of general pathways for mitochondrial mRNA processing and decay in Saccharomyces cerevisiae.
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对 COB mRNA 5-非翻译区突变的抑制分析可识别酿酒酵母中线粒体 mRNA 加工和衰变的一般途径的组成部分。

DOI:
10.1093/genetics/151.4.1315
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发表时间:
1999
期刊:
影响因子:
3.3
通讯作者:
Dieckmann,CL
Dieckmann,CL
中科院分区:
生物学2区
文献类型:
--
作者:
Chen,W;Islas-Osuna,MA;Dieckmann,CL

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酿酒酵母中的细胞色素B基因CO B由线粒体基因组编码。核编码的Cbp 1蛋白是COB mRNA稳定化所必需的。Cbp 1与COB mRNA 5′-非翻译区的64个核苷酸序列中的CCG元件相互作用。CCG中任何核苷酸的突变引起与cbp 1突变相同的表型,即,COB前体和成熟消息两者的不稳定。在这项研究中,11个核抑制基因的单核苷酸突变的CCG分离和表征。一个显性抑制基因位于CBP 1中,而其他10个半显性抑制基因定义了5个不同的连锁群。一组四个突变位于PET 127,它是几种线粒体mRNA 5′端加工所必需的。另一个突变与DSS 1有关,DSS 1是线粒体3′ → 5′核糖核酸外切酶的亚基。与SOC 1基因相关的突变,以前定义为隐性突变,抑制cbp 1 ts等位基因和稳定许多线粒体mRNA,也被分离出来。我们推测,这两个未知基因的产物也影响线粒体RNA周转。
The cytochrome b gene in Saccharomyces cerevisiae, COB, is encoded by the mitochondrial genome. Nuclear-encoded Cbp1 protein is required specifically for COB mRNA stabilization. Cbp1 interacts with a CCG element in a 64-nucleotide sequence in the 5′-untranslated region of COB mRNA. Mutation of any nucleotide in the CCG causes the same phenotype as cbp1 mutations, i.e., destabilization of both COB precursor and mature message. In this study, eleven nuclear suppressors of single-nucleotide mutations in CCG were isolated and characterized. One dominant suppressor is in CBP1, while the other 10 semidominant suppressors define five distinct linkage groups. One group of four mutations is in PET127, which is required for 5′ end processing of several mitochondrial mRNAs. Another mutation is linked to DSS1, which is a subunit of mitochondrial 3′ → 5′ exoribonuclease. A mutation linked to the SOC1 gene, previously defined by recessive mutations that suppress cbp1 ts alleles and stabilize many mitochondrial mRNAs, was also isolated. We hypothesize that the products of the two uncharacterized genes also affect mitochondrial RNA turnover.
DOI: --
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