A function for the mitochondrial chaperonin Hsp60 in the structure and transmission of mitochondrial DNA nucleoids in Saccharomyces cerevisiae.

A function for the mitochondrial chaperonin Hsp60 in the structure and transmission of mitochondrial DNA nucleoids in Saccharomyces cerevisiae.
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DOI:
10.1083/jcb.200306132
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发表时间:
2003-11-10
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Butow RA
Butow RA
中科院分区:
其他
文献类型:
--
作者:
Kaufman BA;Kolesar JE;Perlman PS;Butow RA

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酵母线粒体伴侣蛋白Hsp 60先前已被证明与线粒体DNA(mtDNA)的交换有关:它存在于与单链DNA相关的mtDNA类核苷酸中;在体外它优先与活性mtDNA ori序列的模板链结合;在允许温度下生长的hsp 60温度敏感(ts)突变体中,野生型(ρ+)mtDNA不稳定。在这里,我们表明,线粒体DNA的不稳定性是由线粒体DNA传输到子细胞的缺陷。利用高分辨率荧光去卷积显微镜,我们观察到一个hsp 60-t s突变体的ρ+细胞中mtDNA类核形态的显著改变,这表明类核分裂缺陷。我们发现,由活性ori重复序列组成的p − petite mtDNA在hsp 60-t s突变体中是唯一不稳定的。ori ρ− mtDNA的这种不稳定性需要ori元件内的典型启动子的转录。我们的数据表明,线粒体DNA传输的类核动力学的调节热休克蛋白60和线粒体DNA的ori序列之间的相互作用。
The yeast mitochondrial chaperonin Hsp60 has previously been implicated in mitochondrial DNA (mtDNA) transactions: it is found in mtDNA nucleoids associated with single-stranded DNA; it binds preferentially to the template strand of active mtDNA ori sequences in vitro; and wild-type (ρ+) mtDNA is unstable in hsp60 temperature-sensitive (ts) mutants grown at the permissive temperature. Here we show that the mtDNA instability is caused by a defect in mtDNA transmission to daughter cells. Using high resolution, fluorescence deconvolution microscopy, we observe a striking alteration in the morphology of mtDNA nucleoids in ρ+ cells of an hsp60-t s mutant that suggests a defect in nucleoid division. We show that ρ− petite mtDNA consisting of active ori repeats is uniquely unstable in the hsp60-t s mutant. This instability of ori ρ− mtDNA requires transcription from the canonical promoter within the ori element. Our data suggest that the nucleoid dynamics underlying mtDNA transmission are regulated by the interaction between Hsp60 and mtDNA ori sequences.
DOI: 10.1073/pnas.140063197
发表时间: 2000-07-05
影响因子: 11.1
作者:
Kaufman, BA;Newman, SM;Butow, RA
通讯作者: Butow, RA
DOI: 10.1073/pnas.182539899
发表时间: 2002-10-29
影响因子: 11.1
作者:
Dworkin, J;Losick, R
通讯作者: Losick, R
DOI: 10.1128/mcb.13.5.3050
发表时间: 1993-05-01
影响因子: 5.3
作者:
HALLBERG, EM;SHU, YM;HALLBERG, RL
通讯作者: HALLBERG, RL
DOI: 10.1038/337620a0
发表时间: 1989-02-16
期刊: NATURE
影响因子: 64.8
作者:
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通讯作者: HORWICH, AL
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发表时间: 1989-05-01
影响因子: 5.3
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通讯作者: BREWER, BJ