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• W4366428503 abstract "ABSTRACT Polyolefins derived from plastic wastes are recalcitrant for biological upcycling. However, chemical depolymerization of polyolefins can generate depolymerized plastic (DP) oil comprising of a complex mixture of saturated, unsaturated, even and odd hydrocarbons suitable for biological conversion. While DP oil contains a rich carbon and energy source, it is inhibitory to cells. Understanding and harnessing robust metabolic capabilities of microorganisms to upcycle the hydrocarbons in DP oil, both naturally and unnaturally occurring, into high-value chemicals are limited. Here, we discovered that an oleaginous yeast Yarrowia lipolytica undergoing short-term adaptation to DP oil robustly utilized a wide range of hydrocarbons for cell growth and production of citric acid and neutral lipids. When growing on hydrocarbons, Y. lipolytica partitioned into planktonic and oil-bound cells with each exhibiting distinct proteomes and amino acid distributions invested into establishing these proteomes. Significant proteome reallocation towards energy and lipid metabolism, belonging to two of the 23 KOG (Eukaryotic Orthologous Groups) classes C and I, enabled robust growth of Y. lipolytica on hydrocarbons, with n-hexadecane as the preferential substrate. This investment was even higher for growth on DP oil where both the KOG classes C and I were the top two, and many associated proteins and pathways were expressed and upregulated including the hydrocarbon degradation pathway, Krebs cycle, glyoxylate shunt and, unexpectedly, propionate metabolism. However, a reduction in proteome allocation for protein biosynthesis, at the expense of the observed increase towards energy and lipid metabolisms, might have caused the inhibitory effect of DP oil on cell growth. MPORTANCE Sustainable processes for biological upcycling plastic wastes in a circular bioeconomy are needed to promote decarbonization and reduce environmental pollution due to increased plastic consumption, incineration, and landfill storage. Strain characterization and proteomic analysis revealed the robust metabolic capabilities of Y. lipolytica to upcycle polyethylene into high-value chemicals. Significant proteome reallocation towards energy and lipid metabolisms was required for robust growth on hydrocarbons with n-hexadecane as the preferential substrate. However, an apparent over-investment in these same categories to utilize complex DP oil came at the expense of protein biosynthesis, limiting cell growth. Taken together, this study elucidates how Y. lipolytica activates its metabolism to utilize DP oil and establishes Y. lipolytica as a promising host for the upcycling of plastic wastes." @default.
• W4366428503 created "2023-04-21" @default.
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• W4366428503 date "2023-04-18" @default.
• W4366428503 modified "2023-09-23" @default.
• W4366428503 title "Proteomes Reveal Metabolic Capabilities of<i>Yarrowia lipolytica</i>for Biological Upcycling of Polyethylene into High-Value Chemicals" @default.
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• W4366428503 doi "https://doi.org/10.1101/2023.04.17.537167" @default.
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