Li-Juan Ye

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α-Amino acid ester hydrolases (AEHs) catalyze the synthesis of β-lactam antibiotics containing an α-amino group with decreased activity toward antibiotics with a p-hydroxyl group. The AEH gene from Xanthomonas rubrillineans was cloned and expressed in Escherichia coli. Based on the crystal structure of the AEH and cefprozil complex, 13 residues not directly(More)
α-Amino acid ester hydrolases (AEHs) are enzymes of interest to the semi-synthesis of β-lactam antibiotics with α-amino, such as cephalexin and cefaclor. An undesired side reaction, the hydrolysis of α-amino acid ester, had hindered applications in antibiotics synthesis. Although the enzymes' S/H ratio can be increased by protein engineering, such(More)
This paper reports the synthesis of a new bioactive complex, 8-hydroxyquinolinato-bis-(salicylato) yttrium (III) (HSAY), whose composition and structure were characterized by elemental analysis, IR spectra, thermogravimetric analysis, and X-ray diffraction. The power–time curves of the compounds HSAY, C7H6O3, C9H7NO, and YCl3·6H2O on the growth metabolism(More)
The title compound, [ZnCl(2)(C(12)H(16)BrClN(2)O)], is a mononuclear zinc(II) complex. The Zn(II) atom is four-coordinate in a tetra-hedral geometry, binding to the phenolate O and imine N atoms of the zwitterionic Schiff base ligand and to two Cl(-) ions. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯Cl hydrogen bonds to form(More)
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