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鉴定和重要性的线粒体柠檬酸载体和三磷酸腺苷柠檬酸裂解酶的糖脂生产在嗜热链球菌炸弹。

Identification and importance of mitochondrial citrate carriers and ATP citrate lyase for glycolipid production in Starmerella bombicola.

机构信息

Centre for Synthetic Biology, Department of Biotechnology, Ghent University, Coupure Links 653, 9000, Ghent, Belgium.

出版信息

Appl Microbiol Biotechnol. 2020 Jul;104(14):6235-6248. doi: 10.1007/s00253-020-10702-z. Epub 2020 May 30.

Abstract

Starmerella bombicola is a non-conventional yeast commercially used as a microbial cell factory for sophorolipid production. Sophorolipids are glycolipid biosurfactants composed of a glucose disaccharide sophorose and a fatty acid. In de novo sophorolipid synthesis, the fatty acid moiety is derived from the fatty acid synthesis (FAS) complex; therefore, the yeast's lipid metabolism plays a crucial role in sophorolipid biosynthesis. As a fatty acid precursor, citric acid is a key primary metabolite that connects carbohydrate and lipid metabolism, and in S. bombicola, it also has a regulatory effect on sophorolipid composition and productivity. We aimed to identify the mitochondrial transporters involved in citrate shuttling and the ATP citrate lyase (Acl), the enzyme that converts citric acid into acetyl-CoA. Subsequently, we studied their role in the citric acid shuttle and glycolipid synthesis and the potential of citrate metabolism as a genetic manipulation target for increased glycolipid synthesis. Bioinformatics analyses predicted 32 mitochondrial carriers of which two were identified as citrate transporters, named SbCtp1 and SbYhm2. Deletion of these mitochondrial carriers led to a lesser sophorolipid yield and a shift in the lactonic/acidic sophorolipid ratio. However, only the knockout of SbYhm2 caused a decrease of citric and an increase of malic acid extracellular concentrations. Additionally, deletion of SbAcl1 had a negative effect on S. bombicola's specific growth rate and sophorolipid synthesis and contributed to extra- and intracellular citric acid accumulation. Unexpectedly, SbAcl1 overexpression also decreased glycolipid production.Key Points• Starmerella bombicola is an industrially relevant microbial cell factory for biosurfactant production.• There are 32 predicted mitochondrial carriers in S. bombicola.• Citrate mitochondrial carriers SbYhm2 and SbCtp1 are essential for glycolipid synthesis in S. bombicola.• Deletion of SbAcl1 negatively affects growth and sophorolipid production in S. bombicola. Graphical abstract.

摘要

希梅拉瑞亚棒杆菌是一种非常规酵母,商业上用作生物表面活性剂(如槐糖脂)生产的微生物细胞工厂。槐糖脂是由葡萄糖二糖槐糖和脂肪酸组成的糖脂生物表面活性剂。在新合成的槐糖脂中,脂肪酸部分来源于脂肪酸合成(FAS)复合物;因此,酵母的脂质代谢在槐糖脂生物合成中起着至关重要的作用。作为脂肪酸的前体,柠檬酸是连接碳水化合物和脂质代谢的关键初级代谢物,在希梅拉瑞亚棒杆菌中,它对槐糖脂的组成和产量也有调节作用。我们的目的是鉴定参与柠檬酸穿梭的线粒体转运蛋白和三羧酸循环中的柠檬酸裂解酶(Acl),该酶将柠檬酸转化为乙酰辅酶 A。随后,我们研究了它们在柠檬酸穿梭和糖脂合成中的作用,以及柠檬酸代谢作为增加糖脂合成的遗传操作靶点的潜力。生物信息学分析预测了 32 种线粒体载体,其中两种被鉴定为柠檬酸转运蛋白,分别命名为 SbCtp1 和 SbYhm2。这些线粒体载体的缺失导致槐糖脂产量降低,内酯/酸性槐糖脂比例发生变化。然而,只有 SbYhm2 的敲除会导致柠檬酸的减少和苹果酸的增加。此外,SbAcl1 的缺失对希梅拉瑞亚棒杆菌的比生长速率和槐糖脂合成有负面影响,并导致细胞内外柠檬酸的积累。出乎意料的是,SbAcl1 的过表达也降低了糖脂的产生。关键点:• 希梅拉瑞亚棒杆菌是生物表面活性剂生产的工业相关微生物细胞工厂。• 希梅拉瑞亚棒杆菌中有 32 种预测的线粒体载体。• 柠檬酸线粒体载体 SbYhm2 和 SbCtp1 是希梅拉瑞亚棒杆菌糖脂合成所必需的。• SbAcl1 的缺失对希梅拉瑞亚棒杆菌的生长和槐糖脂的生产有负面影响。

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