Functional characterization of (E)-beta-caryophyllene synthase from lima bean and its up-regulation by spider mites and alamethicin
文献类型: 外文期刊
第一作者: Fu Ning-ning
作者: Fu Ning-ning;Li Feng-qi;Wang Gui-rong;Zhou Jing-jiang
作者机构:
关键词: plant defence;ferpene synthases;(E)-beta-caryophyllene;lima bean
期刊名称:JOURNAL OF INTEGRATIVE AGRICULTURE ( 影响因子:2.848; 五年影响因子:2.979 )
ISSN: 2095-3119
年卷期: 2017 年 16 卷 10 期
页码:
收录情况: SCI
摘要: (E)-beta-Caryophyllene is a sesquiterpene compound widely distributed in plants and functions in plant defence. However, little is known about the sequence and function of (E)-beta-caryophyllene synthase in lima bean (Phaseolus lunatus). Here, we report a new full-length cDNA (PICAHS) encoding (E)-beta-caryophyllene synthase, a possible key enzyme of plant defence. The cDNA of PICAHS contains an open reading frame of 1761 bp, encoding a protein of 586 amino acids with a predicted mass of 67.95 kDa. The deduced amino acid sequence shows 52% identity with sesquiterpene synthase MtCAHS of Medicago truncatula. Based on phylogenetic analysis, PICAHS is classified as the terpene synthases (TPS)-a subfamily. The recombinant enzyme, expressed in Escherichia coli, catalysed the formation of a major product (E)-beta-caryophyllene (82%) and a minor product a-humulene (18%) from farnesyl diphosphate. Real-time quantitative PCR (qRT-PCR) analysis found that the PICAHS transcript was significantly up-regulated in leaves after treatment with spider mites and alamethicin (ALA), suggesting its ecological function in plant defence.
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