Saccharomyces cerevisiae coq10 null mutants are responsive to antimycin A.

Saccharomyces cerevisiae coq10 null mutants are responsive to antimycin A.
复制标题

DOI:
10.1111/j.1742-4658.2010.07862.x
复制
发表时间:
2010-11
期刊:
The FEBS journal
影响因子:
--
通讯作者:
Barros MH
Barros MH
中科院分区:
其他
文献类型:
--
作者:
Busso C;Tahara EB;Ogusucu R;Augusto O;Ferreira-Junior JR;Tzagoloff A;Kowaltowski AJ;Barros MH

文献摘要

参考文献

被引文献

相似文献

在酿酒酵母中,COQ10的缺失会引起一种呼吸缺陷,其特征是缺乏细胞色素c的还原,这可以通过添加外源性扩散辅酶Q2来纠正。与其他辅酶Q6 (Q6)合成受阻的coq突变体不同,coq10突变体具有接近野生型的Q6浓度。在本研究中,我们使用辅酶qh2 -细胞色素c还原酶(bc1复合物)的Q-cycle抑制剂来评估辅酶q10细胞的电子转移特性。我们的研究结果表明,coq10突变体对抗霉素A有反应,表明这些突变体中有一个活跃的Q循环,尽管它们不能通过细胞色素c传递电子,并且对粘噻唑没有反应。EPR光谱分析还表明,尽管coq10细胞中bc1复合物的稳态水平较低,但野生型和coq10线粒体积累的Q6半醌量相似。证实了coq10细胞呼吸链状态的减少,我们发现烟曲霉替代氧化酶在这些细胞中的表达导致抗霉素依赖性H2O2释放减少,并改善了它们的呼吸生长。
Deletion of COQ10 in Saccharomyces cerevisiae elicits a respiratory defect characterized by the absence of cytochrome c reduction, which is correctable by the addition of exogenous diffusible coenzyme Q2. Unlike other coq mutants with hampered coenzyme Q6 (Q6) synthesis, coq10 mutants have near wild-type concentrations of Q6. In the present study, we use Q-cycle inhibitors of the coenzyme QH2-cytochrome c reductase (bc1 complex) to assess electron transfer properties of coq10 cells. Our results show that coq10 mutants respond to antimycin A, indicating an active Q cycle in these mutants, even though they are unable to transport electrons through cytochrome c and are not responsive to myxothiazol. EPR spectroscopic analysis also suggests that wild type and coq10 mitochondria accumulate similar amounts of Q6 semiquinone, despite a lower steady state level of bc1 complex in the coq10 cells. Confirming the reduced respiratory chain state in coq10 cells, we found that the expression of the Aspergillus fumigatus alternative oxidase in these cells leads to a decrease in antimycin-dependent H2O2 release and improves their respiratory growth.
DOI: 10.1016/j.bbalip.2008.10.006
发表时间: 2009-01
影响因子: 4.8
作者:
Marbois, Betn;Gin, Peter;Gulmezian, Melissa;Clarke, Catherine F.
通讯作者: Clarke, Catherine F.
DOI: 10.1073/pnas.052143799
发表时间: 2002-05-14
影响因子: 11.1
作者:
Soccio, RE;Adams, RM;Breslow, JL
通讯作者: Breslow, JL
DOI: 10.1016/j.abb.2007.02.016
发表时间: 2007-07-01
影响因子: 3.9
作者:
Hsieh, Edward J.;Gin, Peter;Clarke, Catherine F.
通讯作者: Clarke, Catherine F.
DOI: 10.1073/pnas.0910351106
发表时间: 2009-11-03
影响因子: 11.1
作者:
Rak, Malgorzata;Tzagoloff, Alexander
通讯作者: Tzagoloff, Alexander
DOI: 10.1016/0014-5793(75)80359-0
发表时间: 1975-01-01
期刊: FEBS LETTERS
影响因子: 3.5
作者:
MITCHELL, P
通讯作者: MITCHELL, P