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Start Over Descriptor "citramalate" Publisher escholarship, university of california
2 results on '"citramalate"'

1. Metabolic engineering of low-pH-tolerant non-model yeast, Issatchenkia orientalis, for production of citramalate

Author

Wu, Zong-Yen, Sun, Wan, Shen, Yihui, Pratas, Jimmy, Suthers, Patrick F, Hsieh, Ping-Hung, Dwaraknath, Sudharsan, Rabinowitz, Joshua D, Maranas, Costas D, Shao, Zengyi, and Yoshikuni, Yasuo

Subjects
Genetics, Acid tolerance, Citramalate, Issatchenkia orientalis, Poly(methyl methacrylate), Transposon
Abstract

Methyl methacrylate (MMA) is an important petrochemical with many applications. However, its manufacture has a large environmental footprint. Combined biological and chemical synthesis (semisynthesis) may be a promising alternative to reduce both cost and environmental impact, but strains that can produce the MMA precursor (citramalate) at low pH are required. A non-conventional yeast, Issatchenkia orientalis, may prove ideal, as it can survive extremely low pH. Here, we demonstrate the engineering of I. orientalis for citramalate production. Using sequence similarity network analysis and subsequent DNA synthesis, we selected a more active citramalate synthase gene (cimA) variant for expression in I. orientalis. We then adapted a piggyBac transposon system for I. orientalis that allowed us to simultaneously explore the effects of different cimA gene copy numbers and integration locations. A batch fermentation showed the genome-integrated-cimA strains produced 2.0 g/L citramalate in 48 h and a yield of up to 7% mol citramalate/mol consumed glucose. These results demonstrate the potential of I. orientalis as a chassis for citramalate production.

Published
2023

2. Metabolic engineering of low-pH-tolerant non-model yeast, Issatchenkia orientalis, for production of citramalate

Author

Zong-Yen Wu, Wan Sun, Yihui Shen, Jimmy Pratas, Patrick F. Suthers, Ping-Hung Hsieh, Sudharsan Dwaraknath, Joshua D. Rabinowitz, Costas D. Maranas, Zengyi Shao, and Yasuo Yoshikuni

Subjects
Citramalate, Acid tolerance, Issatchenkia orientalis, Poly(methyl methacrylate), Endocrinology, Diabetes and Metabolism, Biomedical Engineering, Genetics, Transposon
Abstract

Methyl methacrylate (MMA) is an important petrochemical with many applications. However, its manufacture has a large environmental footprint. Combined biological and chemical synthesis (semisynthesis) may be a promising alternative to reduce both cost and environmental impact, but strains that can produce the MMA precursor (citramalate) at low pH are required. A non-conventional yeast, Issatchenkia orientalis, may prove ideal, as it can survive extremely low pH. Here, we demonstrate the engineering of I. orientalis for citramalate production. Using sequence similarity network analysis and subsequent DNA synthesis, we selected a more active citramalate synthase gene (cimA) variant for expression in I. orientalis. We then adapted a piggyBac transposon system for I. orientalis that allowed us to simultaneously explore the effects of different cimA gene copy numbers and integration locations. A batch fermentation showed the genome-integrated-cimA strains produced 2.0g/L citramalate in 48h and a yield of up to 7% mol citramalate/mol consumed glucose. These results demonstrate the potential of I. orientalis as a chassis for citramalate production.

Published
2023

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