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Nitric Oxide and Hydrogen Peroxide Signaling in Extractive <i>Shiraia</i> Fermentation by Triton X-100 for Hypocrellin A Production
oleh: Xin Ping Li, Yue Wang, Yan Jun Ma, Jian Wen Wang, Li Ping Zheng
Format: | Article |
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Diterbitkan: | MDPI AG 2020-01-01 |
Deskripsi
<i>Shiraia</i> mycelial culture is a promising biotechnological alternative for the production of hypocrellin A (HA), a new photosensitizer for anticancer photodynamic therapy (PDT). The extractive fermentation of intracellular HA in the nonionic surfactant Triton X-100 (TX100) aqueous solution was studied in the present work. The addition of 25 g/L TX100 at 36 h of the fermentation not only enhanced HA exudation to the broth by 15.6-fold, but stimulated HA content in mycelia by 5.1-fold, leading to the higher production 206.2 mg/L, a 5.4-fold of the control on day 9. After the induced cell membrane permeabilization by TX100 addition, a rapid generation of nitric oxide (NO) and hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) was observed. The increase of NO level was suppressed by the scavenger vitamin C (VC) of reactive oxygen species (ROS), whereas the induced H<sub>2</sub>O<sub>2</sub> production could not be prevented by the NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (PTIO), suggesting that NO production may occur downstream of ROS in the extractive fermentation. Both NO and H<sub>2</sub>O<sub>2</sub> were proved to be involved in the expressions of HA biosynthetic genes (<i>Mono</i>, <i>PKS</i> and <i>Omef</i>) and HA production. NO was found to be able to up-regulate the expression of transporter genes (<i>MFS</i> and <i>ABC</i>) for HA exudation. Our results indicated the integrated role of NO and ROS in the extractive fermentation and provided a practical biotechnological process for HA production.