A lignocellulosic hydrolysate-tolerant Aurantiochytrium sp. mutant strain for docosahexaenoic acid production.
To utilize lignocellulosic hydrolysate for docosahexaenoic acid (DHA) production, a novel mutant Aurantiochytrium sp. FN21 with strong tolerance against inhibitory lignocellulosic hydrolysate was obtained through continuous domestication processes from the parent strain Aurantiochytrium sp. FJU-512. Aurantiochytrium sp. FN21 can accumulate 21.3% and 30.7% more DHA compared to its parent strain cultured in fermentation medium and a medium with 50% (v/v) sugarcane bagasse hydrolysate (SBH), respectively. After optimization with different nitrogen sources, the highest lipid (11.84g/L) and DHA (3.15g/L) production were achieved in SBH. The results demonstrated that Aurantiochytrium sp. FN21 has the commercial applications for DHA production using lignocellulosic hydrolysate. In order to elucidate the tolerance mechanism, transcriptomic profiling of the two strains was studied. The highly up-regulated genes and corresponding cellular pathways (TCA cycle, amino acid biosynthesis, fatty acid metabolism and degradation of aromatic compounds) are considered to be associated with the hydrolysate-tolerance of Aurantiochytrium sp. FN21.
['Qi|Feng|F|', 'Zhang|Mingliang|M|', 'Chen|Youwei|Y|', 'Jiang|Xianzhang|X|', 'Lin|Jinxin|J|', 'Cao|Xiao|X|', 'Huang|Jianzhong|J|']
D000222:Adaptation, Physiological D018533:Biomass D004281:Docosahexaenoic Acids D005227:Fatty Acids D020869:Gene Expression Profiling D005786:Gene Expression Regulation D006868:Hydrolysis D008031:Lignin D050356:Lipid Metabolism D009154:Mutation D058009:Stramenopiles
Hydrolysate Aurantiochytrium sp. FN21 Lipid Transcriptome