Ornithine Decarboxylase-Mediated Production of Putrescine Influences Ganoderic Acid Biosynthesis by Regulating Reactive Oxygen Species in Ganoderma lucidum
| Autor: | Peng-Fei Cao, Mingwen Zhao, Ang Ren, Rui Liu, Liang Shi, Tian-Jun Zhang, Jia-Long Tian, Chen-Gao Wu |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
genetic structures Physiology Ornithine Decarboxylase Applied Microbiology and Biotechnology Ornithine decarboxylase Fungal Proteins 03 medical and health sciences chemistry.chemical_compound Biosynthesis Putrescine Secondary metabolism chemistry.chemical_classification Reactive oxygen species Ecology fungi Ganoderic acid Ganoderma Metabolism Triterpenes Oxidative Stress 030104 developmental biology chemistry Biochemistry Polyamine Reactive Oxygen Species Food Science Biotechnology |
| Zdroj: | Applied and environmental microbiology. 83(20) |
| ISSN: | 1098-5336 |
| Popis: | Putrescine is an important polyamine that participates in a variety of stress responses. Ornithine decarboxylase (ODC) is a key enzyme that catalyzes the biosynthesis of putrescine. A homolog of the gene encoding ODC was cloned from Ganoderma lucidum . In the ODC -silenced strains, the transcript levels of the ODC gene and the putrescine content were significantly decreased. The ODC -silenced strains were more sensitive to oxidative stress. The content of ganoderic acid was increased by approximately 43 to 46% in the ODC -silenced strains. The content of ganoderic acid could be recovered after the addition of exogenous putrescine. Additionally, the content of reactive oxygen species (ROS) was significantly increased by approximately 1.3-fold in the ODC -silenced strains. The ROS content was significantly reduced after the addition of exogenous putrescine. The gene transcript levels and the activities of four major antioxidant enzymes were measured to further explore the effect of putrescine on the intracellular ROS levels. Further studies showed that the effect of the ODC-mediated production of putrescine on ROS might be a factor influencing the biosynthesis of ganoderic acid. Our study reports the role of putrescine in large basidiomycetes, providing a basis for future studies of the physiological functions of putrescine in microbes. IMPORTANCE It is well known that ODC and the ODC-mediated production of putrescine play an important role in resisting various environmental stresses, but there are few reports regarding the mechanisms underlying the effect of putrescine on secondary metabolism in microorganisms, particularly in fungi. G. lucidum is gradually becoming a model organism for studying environmental regulation and metabolism. In this study, a homolog of the gene encoding ODC was cloned in Ganoderma lucidum . We found that the transcript level of the ODC gene and the content of putrescine were significantly decreased in the ODC -silenced strains. The content of ganoderic acid was significantly increased in the ODC -silenced strains. Further studies showed that the effect of the ODC-mediated production of putrescine on ROS might be a factor influencing the biosynthesis of ganoderic acid. Our study reports the role of putrescine in large basidiomycetes, providing a basis for future studies of the physiological functions of putrescine in microbes. |
| Databáze: | OpenAIRE |
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