期刊
BIOTECHNOLOGY FOR BIOFUELS
卷 11, 期 -, 页码 -出版社
BMC
DOI: 10.1186/s13068-018-1337-z
关键词
Rhodococcus opacus; Phenol; Triacylglycerol; Mycolic acid; Phospholipid; Mass spectrometry
资金
- U.S. Department of Energy [DE-SC0012705, DE-SC0018324]
- National Institutes of Health [P41-GM103422, P60-DK-20579, P30-DK56341]
- U.S. Department of Energy (DOE) [DE-SC0012705, DE-SC0018324] Funding Source: U.S. Department of Energy (DOE)
BackgroundLignin is a recalcitrant aromatic polymer that is a potential feedstock for renewable fuel and chemical production. Rhodococcus opacus PD630 is a promising strain for the biological upgrading of lignin due to its ability to tolerate and utilize lignin-derived aromatic compounds. To enhance its aromatic tolerance, we recently applied adaptive evolution using phenol as a sole carbon source and characterized a phenol-adapted R. opacus strain (evol40) and the wild-type (WT) strain by whole genome and RNA sequencing. While this effort increased our understanding of the aromatic tolerance, the tolerance mechanisms were not completely elucidated.ResultsWe hypothesize that the composition of lipids plays an important role in phenol tolerance. To test this hypothesis, we applied high-resolution mass spectrometry analysis to lipid samples obtained from the WT and evol40 strains grown in 1g/L glucose (glucose), 0.75g/L phenol (low phenol), or 1.5g/L phenol (high phenol, evol40 only) as a sole carbon source. This analysis identified>100 lipid species of mycolic acids, phosphatidylethanolamines(PEs), phosphatidylinositols(PIs), and triacylglycerols. In both strains, mycolic acids had fewer double bond numbers in phenol conditions than the glucose condition, and evol40 had significantly shorter mycolic acid chain lengths than the WT strain in phenol conditions. These results indicate that phenol adaptation affected mycolic acid membrane composition. In addition, the percentage of unsaturated phospholipids decreased for both strains in phenol conditions compared to the glucose condition. Moreover, the PI content increased for both strains in the low phenol condition compared to the glucose condition, and the PI content increased further for evol40 in the high phenol condition relative to the low phenol condition.ConclusionsThis work represents the first comprehensive lipidomic study on the membrane of R. opacus grown using phenol as a sole carbon source. Our results suggest that the alteration of the mycolic acid and phospholipid membrane composition may be a strategy of R. opacus for phenol tolerance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据