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首页> 外文期刊>The FEBS journal >OPDA isomerase GST16 is involved in phytohormone detoxification and insect development
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OPDA isomerase GST16 is involved in phytohormone detoxification and insect development

机译:OPDA异构酶GST16参与植物激素排毒和昆虫发育

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摘要

12-Oxophytodienoic acid (OPDA), a well-known phytohormone of the jasmonate family, has a reactive alpha,beta-unsaturated carbonyl structure which easily adds cellular nucleophiles (Michael addition), making OPDA potentially toxic for herbivores. The glutathione S-transferase GST16 inactivates 12-OPDA in the insect gut by isomerization to inactive iso-OPDA. Quantitative tissue expression analysis showed that HarmGST16 transcripts were present in most larval tissues, including those of the midgut, fatbody and Malpighian tubules. Activity assays confirmed the presence of an active enzyme. Interestingly, feeding different diets to Helicoverpa armigera influenced gst16 expression levels in various tissues, and larvae fed wild-type tobacco leaves had reduced gst16 mRNA levels. The temporal expression of HarmGST16 during larval development was high in the second instar and reduced during the third, fourth and fifth instars. Plant-mediated RNA interference silencing of HarmGST16 retarded larval growth of H. armigera. Injecting cis-OPDA into the hemolymph of larvae caused premature pupation. This result, as well as the finding that GST16 influenced the growth of insects, suggests that GST16 may play an important role in larval development.
机译:茉莉酸家族的一种著名的植物激素12-氧代乙二酸(OPDA)具有反应性的α,β-不饱和羰基结构,很容易添加细胞亲核试剂(Michael加成),使OPDA对草食动物具有潜在毒性。谷胱甘肽S-转移酶GST16通过异构化成非活性的iso-OPDA而使昆虫肠道中的12-OPDA失活。定量组织表达分析表明,HarmGST16转录本存在于大多数幼虫组织中,包括中肠,脂肪体和马尔皮基小管。活性测定证实了活性酶的存在。有趣的是,饲喂不同日粮的棉铃虫会影响各种组织中gst16的表达水平,而用幼虫饲喂的野生型烟叶则降低了gst16 mRNA的水平。在幼虫发育期间,HarmGST16的时间表达在第二龄幼虫中较高,而在第三龄,第四龄和第五龄幼虫中降低。 HarmGST16的植物介导的RNA干扰沉默抑制了棉铃虫的幼虫生长。将cis-OPDA注入幼虫的血淋巴可引起早幼化脓。该结果以及GST16影响昆虫生长的发现表明,GST16可能在幼虫发育中起重要作用。

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