文献类型：期刊文献

英文题名：Synergistic Regulation of Metabolism by Ca2+/Reactive Oxygen Species in Penicillium brevicompactum Improves Production of Mycophenolic Acid and Investigation of the Ca2+ Channel

作者：Chen, Mianhui[1];Wang, Jingjing[1];Lin, Lin[2,3];Xu, Xiangyang[4];Wei, Wei[1];Shen, Yaling[1];Wei, Dongzhi[1]

机构：[1]East China Univ Sci & Technol, Newworld Inst Biotechnol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Technol, Sch Chem & Environm Engn, Shanghai 201418, Peoples R China;[3]Natl Engn Res Ctr Nanotechnol, Res Lab Funct Nanomat, Shanghai 200241, Peoples R China;[4]Zaozhuang Jie Nuo Enzyme Co Ltd, Zaozhuang 277100, Peoples R China

年份：2022

卷号：11

期号：1

起止页码：273

外文期刊名：ACS SYNTHETIC BIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000736842900001)】；

基金：M.C. and W.W. received funding from the Shanghai Natural Science Foundation (no. 20ZR1415400), the Shanghai outstanding technical leaders plan 19XD1431900 and 19XD1431800, the National Natural Science Foundation of China (grant nos. 81830052 and 81530053), and Shanghai Key Laboratory of Molecular Imaging (18DZ2260400).

语种：英文

外文关键词：mycophenolic acid (MPA); ROS; calcium; pigment; Penicillium brevicompactum; VHb

摘要：Although Penicillium brevicompactum is a very important industrial strain for mycophenolic acid production, there are no reports on Ca2+/reactive oxygen species (ROS) synergistic regulation and calcium channels, Cch-pb. This study initially intensified the concentration of the intracellular Ca2+ in the high yielding mycophenolic acid producing strain NRRL864 to explore the physiological role of intracellular redox state in metabolic regulation by Penicillium brevicompactum. The addition of Ca2+ in the media caused an increase of intracellular Ca2+, which was accompanied by a strong increase, 1.5 times, in the higher intracellular ROS concentration. In addition, the more intensive ROS sparked the production of an unreported pigment and increase in mycophenolic acid production. Furthermore, the Ca2+ channel, the homologous gene of Cch1, Cch-pb, was investigated to verify the relationship between Ca2+ and the intracellular ROS. The Vitreoscilla hemoglobin was overexpressed, which was bacterial hemoglobin from Vitreoscilla, reducing the intracellular ROS concentration to verify the relationship between the redox state and the yield of mycophenolic acid. The strain pb-VGB expressed the Vitreoscilla hemoglobin exhibited a lower intracellular ROS concentration, 30% lower, and decreased the yield of mycophenolic acid as 10% lower at the same time. Subsequently, with the NRRL864 fermented under 1.7 and 28 mM Ca2+, the [NADH]/[NAD(+)] ratios were detected and the higher [NADH]/[NAD(+)] ratios (4 times higher with 28 mM) meant a more robust primary metabolism which provided more precursors to produce the pigment and the mycophenolic acid. Finally, the 10 times higher calcium addition in the media resulted in 25% enhanced mycophenolic acid production to 6.7 g/L and induced pigment synthesis in NRRL864.