Hydroxylation of demethoxy-Q6 constitutes a control point in yeast coenzyme Q6 biosynthesis.

Hydroxylation of demethoxy-Q6 constitutes a control point in yeast coenzyme Q6 biosynthesis.
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DOI:
10.1007/s00018-008-8547-7
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发表时间:
2009-01
影响因子:
8
通讯作者:
Santos-Ocana, C.
Santos-Ocana, C.
中科院分区:
生物学1区
文献类型:
--
作者:
Padilla, S.;Tran, U. C.;Jimenez-Hidalgo, M.;Lopez-Martin, J. M.;Martin-Montalvo, A.;Clarke, C. F.;Navas, P.;Santos-Ocana, C.

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辅酶Q是呼吸和抗氧化保护所需的脂质分子。酿酒酵母中Q的生物合成需要9种蛋白质(Coq 1 p-Coq 9 p)。我们在这项研究中表明,Q水平调制生长过程中,其转换从脱甲氧基Q(DMQ),后期中间体。当细胞经受氧化应激条件时,产生类似的转化。Q6/DMQ 6比率的变化伴随着COQ 7基因mRNA水平的变化,COQ 7基因mRNA水平编码负责DMQ羟基化的蛋白质,这是Q生物合成途径中的倒数第二步。酵母coq无效突变体未能积累任何Q晚期生物合成中间体。然而,在coq 7突变体中,外源Q的添加产生DMQ合成。过表达ABC 1/COQ 8也产生了类似的效果。这些结果支持存在允许DMQ 6积累的生物合成复合物,并表明Coq 7 p是酵母中Q生物合成调节的控制点。
Coenzyme Q is a lipid molecule required for respiration and antioxidant protection. Q biosynthesis in Saccharomyces cerevisiae requires nine proteins (Coq1p–Coq9p). We demonstrate in this study that Q levels are modulated during growth by its conversion from demethoxy-Q (DMQ), a late intermediate. Similar conversion was produced when cells were subjected to oxidative stress conditions. Changes in Q6/DMQ6 ratio were accompanied by changes in COQ7 gene mRNA levels encoding the protein responsible for the DMQ hydroxylation, the penultimate step in Q biosynthesis pathway. Yeast coq null mutant failed to accumulate any Q late biosynthetic intermediate. However, in coq7 mutants the addition of exogenous Q produces the DMQ synthesis. Similar effect was produced by over-expressing ABC1/COQ8. These results support the existence of a biosynthetic complex that allows the DMQ6 accumulation and suggest that Coq7p is a control point for the Q biosynthesis regulation in yeast.
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