Production of cyclodepsipeptides destruxin A and B from Metarhizium anisopliae.
Maltose and peptone were the best carbon and nitrogen sources for the production of destruxins from Metarhizium anisopliae. With the addition of 0.1% (w/v) beta-alanine to the basal medium, the yields of cyclodepsipeptides DA and DB were 7.2 and 279 mg/L, respectively, which was 2-fold higher than that of control experiment. Response surface methodology (RSM) was applied to optimize the compositions of maltose, peptone, beta-alanine, and glucose used in a shaker-flask cultivation of M. anisopliae for the production of DA and DB. Estimated optimal compositions for the DA production were maltose 2.58%, peptone 0.72%, beta-alanine 0.02%, and glucose 0.55%. The predicted DA yield was 18.5 mg/L. On the other hand, the optimal compositions for DB production were maltose 2.51%, peptone 0.75%, beta-alanine 0.02%, and glucose 0.43%. A maximum DB yield of 232 mg/L was predicted. These were confirmed by cultivation experiments conducted at the optimized conditions for maximum destruxins production in a shaker-flask. Furthermore, a modest high level of DA (49 mg/L) and DB (268 mg/L) yields were obtained by employing the response surface methodology optimized DB production medium in a no-baffle, stirred-tank fermentor.
Liu
B L
BL
Institute of Biotechnology, National Dong Hwa University, Shoufeng, Hualien, Taiwan, Republic of China.
Chen
J W
JW
Tzeng
Y M
YM
D000596:Amino Acids / Q000737:chemistry; D001203:Ascomycota / Q000378:metabolism*; D003470:Culture Media; D047630:Depsipeptides; D005285:Fermentation; D009183:Mycotoxins / Q000096:biosynthesis*; D010456:Peptides, Cyclic / Q000096:biosynthesis* / Q000737:chemistry
D000596:Amino Acids; D003470:Culture Media; D047630:Depsipeptides; D009183:Mycotoxins; D010456:Peptides, Cyclic; C040423:destruxin A; C040424:destruxin B