Cytochrome P450–catalyzed L-tryptophan nitration in thaxtomin phytotoxin biosynthesis.

Cytochrome P450–catalyzed L-tryptophan nitration in thaxtomin phytotoxin biosynthesis.
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DOI:
10.1038/nchembio.1048
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发表时间:
2012-10
影响因子:
14.8
通讯作者:
--
中科院分区:
生物学1区
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由植物病原性链霉菌属物种产生的Thaxtomin植物毒素含有对植物毒性至关重要的硝基。Thaxtomins的N,N '-二甲基二酮哌嗪核心由L-苯丙氨酸和L-4-硝基色氨酸通过非核糖体肽合成酶组装而成,一氧化氮合酶产生的NO被掺入硝基,但非蛋白质氨基酸L-4-硝基色氨酸的生物合成尚不清楚。在这里,我们报告TxtE,一个独特的细胞色素P450,催化L-色氨酸硝化使用NO和O2。
Thaxtomin phytotoxins produced by plant-pathogenic Streptomyces species contain a nitro group that is essential for phytotoxicity. The N,N’-dimethyldiketopiperazine core of thaxtomins is assembled from L-phenylalanine and L-4-nitrotryptophan by a nonribosomal peptide synthetase and nitric oxide synthase-generated NO is incorporated into the nitro group, but the biosynthesis of the non-proteinogenic amino acid L-4-nitrotryptophan is unclear. Here we report that TxtE, a unique cytochrome P450, catalyzes L-tryptophan nitration using NO and O2.