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Proteomic studies on anti-tumor agent ansamitocin P-3 producer Actinosynnema pretiosum in response to ammonium and isobutanol


Our previous work showed that the biosynthesis of ansamitocin P-3 (AP-3), an anti-tumor agent, by Actinosynnema pretiosum was depressed by ammonium but enhanced by isobutanol in the medium. Here we show proteomics analyses on A. pretiosum in different fermentation conditions with and without ammonium or isobutanol using two-dimensional electrophoresis (2-DE), matrix-assisted laser desorption/ionization, and linear ion trap quadrupole mass spectrometry. Pairwise comparison of repetitive 2-DE maps was performed to find differentially expressed spots, and eight proteins were identified as functionally annotated ones. Among these proteins, d-3-phosphoglycerate dehydrogenase (PGDH) and glyceraldehyde 3-phosphate dehydrogenase showed statistically significant up-regulation in ammonium vs. basic or isobutanol medium, while fatty acid synthetase, histidine–tRNA ligase, transposase, molecular chaperone GroEL, SAM-dependent methyltransferase, and Crp/Fnr family transcriptional regulator were overexpressed in ammonium vs. basic medium. Based on the 2-DE data, exogenous l-serine which could inhibit the PGDH activity was added to the cultures with isobutanol, and a lower AP-3 production was confirmed under 2.5 mM serine addition (24 or 48 h).

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This work was supported by National Natural Science Foundation of China (project # 31370083) and Program of Shanghai Subject Chief Scientist (project # 14XD1402600). The financial support from the National High Technology R&D Program (863 project # 2006AA10A202) of the Ministry of Science and Technology of China (MoST) in the initial stage was also greatly appreciated.

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Correspondence to Jinxia Lin.

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Lin, J., Zhong, J. Proteomic studies on anti-tumor agent ansamitocin P-3 producer Actinosynnema pretiosum in response to ammonium and isobutanol. Bioprocess Biosyst Eng 40, 1133–1139 (2017).

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  • Ansamitocin P-3 production
  • Proteomics
  • Actinosynnema pretiosum
  • Secondary metabolite biosynthesis
  • Cellular physiology and metabolism