Qin Ye

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BACKGROUND Most bacteria can use various compounds as carbon sources. These carbon sources can be either co-metabolized or sequentially metabolized, where the latter phenomenon typically occurs as catabolite repression. From the practical application point of view of utilizing lignocellulose for the production of biofuels etc., it is strongly desirable to(More)
Glutathione (GSH) is an important bioactive substance applied widely in pharmaceutical and food industries. Due to the strong product inhibition in the GSH biosynthetic pathway, high levels of intracellular content, yield and productivity of GSH are difficult to achieve. Recently, a novel bifunctional GSH synthetase was identified to be less sensitive to(More)
Escherichia coli MG1655 (DE3) with the ability to synthesize butanol from glycerol was constructed by metabolic engineering. The genes thil, adhe2, bcs operon (crt, bcd, etfB, etfA, and hbd) were cloned into the plasmid vectors, pETDuet-1 and pACYCDuet-1, then the two resulting plasmids, pACYC-thl-bcs and pET-adhe2, were transferred to E. coli, and the(More)
Glutathione (GSH), an important bioactive substance, is widely applied in pharmaceutical and food industries. In this work, two bifunctional L-glutathione synthetases (GshF) from Actinobacillus pleuropneumoniae (GshFAp) and Actinobacillus succinogenes (GshFAs) were successfully expressed in Escherichia coli BL-21(DE3). Similar to the GshF from Streptococcus(More)
BACKGROUND L-glutathione (GSH) is a non-protein thiol compound with important biological properties and is widely used in pharmaceutical, food, cosmetic and health products. The cellular GSH is determined by the activity and characteristic of GSH-synthesizing enzymes, energy and precursor supply, and degradation of formed GSH. RESULTS In this study, genes(More)
BACKGROUND Trans-4-hydroxy-L-proline (trans-Hyp), one of the hydroxyproline (Hyp) isomers, is a useful chiral building block in the production of many pharmaceuticals. Although there are some natural biosynthetic pathways of trans-Hyp existing in microorganisms, the yield is still too low to be scaled up for industrial applications. Until now the production(More)
(S)-(+)-2,2-Dimethylcyclopropane carboxylic acid [(S)-(+)-DMCPA] is a key chiral intermediate for production of Cilastatin, an excellent renal dehydropeptidase-I inhibitor. In this study, a new method for preparation of (S)-(+)-DMCPA with microbial esterases was investigated. A microbial screening program obtained six esterase-producing isolates that could(More)
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