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Today's Hours
McClellanville Library
Closed for renovations
Phone: (843) 887-3699
Miss Jane's Building (Edisto Library Temporary Location)
2 p.m. – 6 p.m.
Phone: (843) 869-2355
Main Library
9 a.m. - 8 p.m.
Phone: (843) 805-6930
West Ashley Library
9 a.m. - 7 p.m.
Phone: (843) 766-6635
Folly Beach Library
Closed for renovations
Phone: (843) 588-2001
John L. Dart Library
9 a.m. - 7 p.m.
Phone: (843) 722-7550
St. Paul's/Hollywood Library
9 a.m. - 8 p.m.
Phone: (843) 889-3300
Mt. Pleasant Library
9 a.m. – 8 p.m.
Phone: (843) 849-6161
Dorchester Road Library
9 a.m. - 8 p.m.
Phone: (843) 552-6466
Edgar Allan Poe/Sullivan's Island Library
9 a.m. - 1 p.m.
Phone: (843) 883-3914
John's Island Library
9 a.m. - 8 p.m.
Phone: (843) 559-1945
Wando Mount Pleasant Library
9 a.m. - 8 p.m.
Phone: (843) 805-6888
Otranto Road Library
9 a.m. - 8 p.m.
Phone: (843) 572-4094
Hurd/St. Andrews Library
Closed (Toddler Storytime)
Phone: (843) 766-2546
Baxter-Patrick James Island
9 a.m. - 8 p.m.
Phone: (843) 795-6679
Bees Ferry West Ashley Library
9 a.m. - 8 p.m.
Phone: (843) 805-6892
Village Library
9 a.m. - 1 p.m.
Phone: (843) 884-9741
Keith Summey North Charleston Library
9 a.m. – 8 p.m.
Phone: (843) 744-2489
Mobile Library
9 a.m. - 5 p.m.
Phone: (843) 805-6909
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Systems engineering of Escherichia colifor high-level l-alanine production
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- Author(s): Nie, Yupeng; Yao, Mingjing; Jiang, Guozheng; Yang, Yi; Wang, Shenbiao; Xu, Hui; Liang, Jiayuan; Ren, Xuebing; Tian, Yanjun
- Source:
Food Bioscience; June 2024, Vol. 59 Issue: 1 - Source:
- Additional Information
- Abstract: l-alanine is a critical natural amino acid that is widely used in the food, pharmaceutical, and personal care industries. However, low titer and long fermentation period limits the industrial viability of l-alanine production. In this study, we engineered a microbial cell factory for efficient l-alanine synthesis using a variety of metabolic engineering strategies. Initially, l-alanine was biosynthesized through the heterologous introduction of alanine dehydrogenase from Geobacillus stearothermophilus. Thereafter, the l-alanine biosynthetic pathway and transport module were modified to improve its titers. Furthermore, a dynamic response system was constructed based on the l-alanine-driven PAla-7promoter to regulate the tolerance target BetTexpression and enhance the tolerance of Escherichia colito high l-alanine concentrations. Finally, the resultant strain E. coliW-PAla-7-BetT could produce 134.5 g/L of l-alanine in 24 h in a 5-L bioreactor, with 5.6 g/L/h of productivity, which is the highest productivity reported to date. Our findings may help in constructing high-performance microbial cell factories for the production of l-alanine and other valuable chemicals.
- Abstract:
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