title: Proteomic studies on anti-tumor agent ansamitocin P-3 producer Actinosynnema pretiosum in response to ammonium and isobutanol.
abstract: 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).
authors.affiliation: Zhangzhou Pientzehuang Pharmaceutical Co., Ltd., Shangjie, Zhangzhou, 363000, China. jinxialin2013@126.com.
authors.forename: Jinxia
authors.initials: J
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Microbial Metabolism, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dong-chuan Road, Shanghai, 200240, China.
authors.forename: Jian-Jiang
authors.initials: JJ
authors.lastname: Zhong
mesh_terms: D039903:Actinobacteria; D064751:Ammonium Compounds; D000440:Butanols; D008453:Maytansine / Q000031:analogs & derivatives; D040901:Proteomics; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D064751:Ammonium Compounds; D000440:Butanols; D008453:Maytansine; C040507:isobutyl alcohol; C015682:ansamitocins
keywords: Actinosynnema pretiosum; Ansamitocin P-3 production; Cellular physiology and metabolism; Proteomics; Secondary metabolite biosynthesis