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.
中科院分区:
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.
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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DOI:
10.1016/s1388-1981(00)00019-6
发表时间:
2000-04-12
影响因子:
4.8
作者:
Hsu, AY;Do, TQ;Clarke, CF
通讯作者:
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影响因子:
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通讯作者:
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影响因子:
4.8
作者:
Do, TQ;Hsu, AY;Clarke, CF
通讯作者:
Clarke, CF