title: Comparative lipidomic profiling of xylose-metabolizing S. cerevisiae and its parental strain in different media reveals correlations between membrane lipids and fermentation capacity.
abstract: Phospholipids (PLs) serve as the foundation for structure and function in most cell membranes. In order to reveal the correlations between PLs composition and fermentation performance of cells, a comparative lipidomics study was carried out using a recombinant xylose fermenting yeast strain Saccharomyces cerevisiae 424A(LNH-ST) and its parental strain 4124. Profiling of yeast lipids was performed using ultra performance liquid chromatography (UPLC)-MS/MS, leading to identification of 123 PL species. PL compositions were determined for both strains grown in rich medium (yeast extract peptone), limited medium (yeast nitrogen base), and ammonia fiber expansion pretreated corn stover hydrolysate. Principal component analysis of lipidomic data revealed that the PL profile for both strains varied significantly depending upon cultivating media composition. Further analysis of different classes of PLs revealed that the phosphatidylinositol/phosphatidylserine (PI/PS) ratio was closely related to cell growth rates. Both strains possessed higher phosphatidylcholine (PC) levels at an expense of phosphatidylethanolamine (PE) levels when entering stationary phase and the PC/PE ratios showed consistency with glucose utilization rates. Interestingly, PI synthesis lagged behind when available nutrients were limited, and PI levels were closely correlated with xylose metabolism.
authors.affiliation: PO Box 6888, Key Laboratory of Systems Bioengineering, Ministry of Education, Tianjin University, Tianjin 300072, PR China.
authors.forename: Jinmei
authors.initials: J
authors.lastname: Xia
authors.forename: A Daniel
authors.initials: AD
authors.lastname: Jones
authors.forename: Ming W
authors.initials: MW
authors.lastname: Lau
authors.forename: Ying-Jin
authors.initials: YJ
authors.lastname: Yuan
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Dale
authors.forename: Venkatesh
authors.initials: V
authors.lastname: Balan
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003470:Culture Media / Q000737:chemistry; D005285:Fermentation; D008563:Membrane Lipids / Q000032:analysis*; D010743:Phospholipids / Q000032:analysis*; D012441:Saccharomyces cerevisiae / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D014994:Xylose / Q000378:metabolism*
chemical_list: D003470:Culture Media; D008563:Membrane Lipids; D010743:Phospholipids; D014994:Xylose