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• W2912191239 endingPage "12" @default.
• W2912191239 startingPage "6" @default.
• W2912191239 abstract "Adipate is a linear C6 dicarboxylic acid, and is a crucial commercial material mainly used to produce the polymer nylon-6,6. In this study, the pathway producing adipate via a reverse reaction of degradation pathway of adipic acid was ported from Thermobifida fusca to Escherichia coli (E. coli). The pathway contains 6 genes: Tfu_0875, Tfu_2399, Tfu_0067, Tfu_1647, Tfu_2576 and Tfu_2577, which encodes β-ketothiolase, 3-hydroxyacyl-CoA dehydrogenase, 3-hydroxyadipyl-CoA dehydrogenase, 5-carboxy-2-pentenoyl-CoA reductase and adipyl-CoA synthetase, respectively. Of the genes in this pathway, Tfu_1647 is the limited step. Here, we constructed a homology model of 5-carboxy-2-pentenoyl-CoA reductase and found that Lys295 and Glu334 were the active sites. We carried out ten site-directed mutations of these two residues including E334D, K295R, K295Q, K295Y, K295 F, E334R, E334H, E334 K, E334 W, and E334 F. The enzymatic activity of Tfu_1647 in pTrc99A-0067-1647 of E334D, E334 F, and E334R were much higher than that in the control. The Km values of E334D, E334 F, and E334R were significantly reduced compared with the control. The strain with E334D had the highest adipic acid titer (0.23 g/L) with 5.8% of the theoretical yield. The rational reconstruction of 5-carboxy-2-pentenoyl-CoA reductase is a potential approach in improving the enzymatic activity and titer of adipate." @default.
• W2912191239 created "2019-02-21" @default.
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• W2912191239 date "2019-06-01" @default.
• W2912191239 modified "2023-10-15" @default.
• W2912191239 title "Site-directed mutation to improve the enzymatic activity of 5-carboxy-2-pentenoyl-CoA reductase for enhancing adipic acid biosynthesis" @default.
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• W2912191239 doi "https://doi.org/10.1016/j.enzmictec.2019.02.006" @default.
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