Identification of methyl jasmonate-induced cardiac glycosides and related biosynthetic transcripts from callus culture of Calotropis gigantea using transcriptome and metabolite profiling

IF 2.2 3区 生物学 Q4 CELL BIOLOGY
Pankaj Singh, Akansha Pandey, Carol Janis Bilung, Amar Jeet, Renu Nimoriya, Shiv Nandan, Sanjeev Kanojia, Dipak Kumar Mishra, Vineeta Tripathi
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引用次数: 0

Abstract

Cardiac glycosides (CGs) are well known for treating congestive heart failure, and several CGs like digoxin, digitoxin, and ouabain are marketed as drugs. In the present study, we have biosynthesized two CGs (CGCL520/227 and CGCL534/209) and elicited them up to 537- and 357-fold respectively in response to methyl jasmonate (MJ) treatment. For identification of the key enzyme involved in its biosynthesis, a comparative transcriptome sequencing of control and MJ elicited (75.0 mg L−1 for 3 d) callus culture was done. A total of 17,898 transcripts were expressed across all samples. Annotated unigenes were functionally categorized based on gene ontology. A total of 7625 unigenes were significantly matched in the KEGG database involved in 151 different plant metabolism pathways. Upon digital expression analysis, 2924 MJ-responsive transcripts were identified, and among them 166 were unique for MJ-treated samples. A majority of upregulated transcripts were categorized under hydrolase activity, oxido-reductase activity, metabolic processes, and carbohydrate metabolic process. Based on their role in terpenoid, steroid, and cardenolide pathways, 295 putative unigenes representing 24 gene families involved in CG biosynthesis were identified. Expression analysis revealed that 12 transcripts involved in steroid and cardenolide biosynthetic pathways were upregulated in response to MJ. The highest expression was recorded for squalene monooxygenase (SMO) with 43-fold upregulation, followed by sterol delta7 reductase (DWF5) with 22.2-fold. C-5 sterol desaturase (STE1), 4-diphosphocytidyl-2-C-methyl-D-erythritolkinase/4diphosphocytidyl-2C-methyl-D-erythritol synthase (CMK), 4-hydroxy-3-methylbut-2-enyl diphosphate reductase (HDR), acetyl-CoA C-acetyltransferase (AACT), mono-oxygenases (MO), and progesterone 5β-reductase (PBR) showed high and significant expressions of 16.4-, 16.1-, 14.8-, 14.7-, 13.4-, and 11.3-fold, respectively. This study not only identifies MJ-responsive CGs and related transcripts involved in CG biosynthesis, but also provides scope for the development of biotechnological process for biosynthesis and enrichment of targeted CGs using identified rate-limiting key enzymes.

Abstract Image

利用转录组和代谢物分析鉴定茉莉酸甲酯诱导的萼片苷和相关生物合成转录本
众所周知,强心苷(CGs)可用于治疗充血性心力衰竭,地高辛、地高辛和乌巴因等几种强心苷已作为药物上市销售。在本研究中,我们生物合成了两种CG(CGCL520/227和CGCL534/209),并在茉莉酸甲酯(MJ)处理下分别激发了537倍和357倍。为鉴定参与其生物合成的关键酶,对对照组和 MJ 诱导(75.0 mg L-1 3 d)的胼胝体培养物进行了转录组测序比较。所有样本中共表达了 17 898 个转录本。根据基因本体论对注释的单基因进行了功能分类。在 KEGG 数据库中,共有 7625 个单体基因与 151 条不同的植物代谢途径相匹配。通过数字表达分析,确定了 2924 个 MJ 响应转录本,其中 166 个是 MJ 处理过的样品所独有的。大部分上调的转录本被归类为水解酶活性、氧化还原酶活性、代谢过程和碳水化合物代谢过程。根据它们在萜类化合物、类固醇和豆蔻内酯途径中的作用,确定了 295 个推测的单基因,代表了参与 CG 生物合成的 24 个基因家族。表达分析表明,参与类固醇和卡尔德内酯生物合成途径的 12 个转录本在对 MJ 的反应中上调。表达量最高的是角鲨烯单加氧酶(SMO),上调了 43 倍,其次是甾醇 delta7 还原酶(DWF5),上调了 22.2 倍。C-5甾醇去饱和酶(STE1)、4-二磷酸胞苷基-2-C-甲基-D-赤藓糖醇合成酶(CMK)、4-羟基-3-甲基丁-2-烯基二磷酸还原酶(HDR)、乙酰-CoA C-乙酰转移酶(AACT)、单氧酶(MO)和孕酮 5β-还原酶(PBR)在 16.4倍、16.1倍、14.8倍、14.7倍、13.4倍和11.3倍。这项研究不仅确定了 MJ 响应的 CGs 和参与 CG 生物合成的相关转录本,还为利用已确定的限速关键酶进行生物合成和富集目标 CGs 的生物技术工艺的开发提供了空间。
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来源期刊
CiteScore
5.00
自引率
7.70%
发文量
71
审稿时长
6-12 weeks
期刊介绍: Founded in 1965, In Vitro Cellular & Developmental Biology - Plant is the only journal devoted solely to worldwide coverage of in vitro biology in plants. Its high-caliber original research and reviews make it required reading for anyone who needs comprehensive coverage of the latest developments and state-of-the-art research in plant cell and tissue culture and biotechnology from around the world.
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