Parsing a multifunctional biosynthetic gene cluster from rice: Biochemical characterization of CYP71Z6 & 7.

Parsing a multifunctional biosynthetic gene cluster from rice: Biochemical characterization of CYP71Z6 & 7.
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DOI:
10.1016/j.febslet.2011.09.038
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发表时间:
2011-11-04
期刊:
影响因子:
3.5
通讯作者:
Peters RJ
Peters RJ
中科院分区:
生物学3区
文献类型:
--
作者:
Wu Y;Hillwig ML;Wang Q;Peters RJ

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水稻(Oryza sativa)含有一个生物合成基因簇,该基因簇与至少两组二萜类植物抗毒素(抗真菌植物卡桑烷和抗细菌米素)的产生相关。虽然已知来自该簇的细胞色素P450(P450)参与植物卡桑的产生,但与oryzalide生物合成相关的这种单加氧酶活性是未知的。在这里,我们报告的生化表征表明,CYP 71 Z6从这个集群作为一个内异贝壳杉烯C2-羟化酶,推测参与了oryzalides的生物合成。我们的研究结果进一步表明,密切相关的和共簇的CYP 71 Z7可能作为C2-羟化酶参与植物卡桑生物合成的后一步。因此,CYP 71 Z6和7似乎在水稻二萜类化合物代谢中发挥了独特的作用,为深入了解植物生物合成基因簇的进化提供了线索。
Rice (Oryza sativa) contains a biosynthetic gene cluster associated with production of at least two groups of diterpenoid phytoalexins, the antifungal phytocassanes and antibacterial oryzalides. While cytochromes P450 (CYP) from this cluster are known to be involved in phytocassane production, such mono-oxygenase activity relevant to oryzalide biosynthesis was unknown. Here we report biochemical characterization demonstrating that CYP71Z6 from this cluster acts as an ent-isokaurene C2-hydroxylase that is presumably involved in the biosynthesis of oryzalides. Our results further suggest that the closely related and co-clustered CYP71Z7 likely acts as a C2-hydroxylase involved in a latter step of phytocassane biosynthesis. Thus, CYP71Z6 & 7 appear to have evolved distinct roles in rice diterpenoid metabolism, offering insight into plant biosynthetic gene cluster evolution.
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