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91.
《Bioscience, biotechnology, and biochemistry》2013,77(10):1956-1957
The sweetness-suppressing polypeptide gurmarin has been isolated from the leaves of Gymnema sylvestre and consists of 35 amino acid residues including three intramolecular disulfide bonds. The primary structure has already been determined. The positions of the disulfide bonds were located, by a combination of mass spectrometric analysis and sequencing of cystine-containing pep tides obtained by thermolysin-catalyzed hydrolysis of gurmarin, to be at Cys3–Cys18, Cys10–Cys23, and Cys17–Cys33. 相似文献
92.
Višnja Vrdoljak Biserka Prugove?ki Dubravka Matkovi?-?alogovi? Predrag Novak Marina Cindri? 《Inorganica chimica acta》2010,363(13):3516-3522
The first structurally characterised oxomolybdenum(V) complexes with thienyl carboxylate ligands were prepared by the reaction of [Mo2O3(C5H7O2)4] or (NH4)2[MoOCl5] with the corresponding acid (2-thiophenecarboxylic, 5-methyl-2-thiophenecarboxylic or 3-(3-thienyl)acrylic acid). Complexes [Mo2O3(μ-OC2H5)(μ-O2CR)(C5H7O2)2](R = -C4H3S (1), -C4H2S(CH3) (2) or -CHCHC4H3S (3)) were obtained upon substitution of two acetylacetonate ligands from [Mo2O3(C5H7O2)4] with RCOO− in dry ethanol. Reactions of (NH4)2[MoOCl5] with the corresponding thienyl carboxylic acid in the presence of γ-picoline (C6H7N) yielded complexes (C6H7NH)[Mo2O4(μ-O2CR)Cl2(C6H7N)2] (R = -C4H3S (4), -C4H2S(CH3) (5) or -CHCHC4H3S (6)). All of the six new complexes were characterised as dinuclear. The molecular structures of 1, 3, 4·0.5CH3CN and 5 were determined by the single crystal X-ray diffraction method. In the complexes the two molybdenum atoms are doubly bridged either by one oxygen and one ethoxy-oxygen, or alternatively by two oxo-oxygens, and are additionally bridged by the thienyl carboxylate ion in a didentate bridging manner. All complexes were further characterised by means of chemical analysis, IR spectroscopy, TG and in some cases by the one and two-dimensional NMR method. 相似文献
93.
The application of various artificial electron mediators in combination with redox enzymes present in anaerobically grown cells is described. Examples include viologens of different redox potential, cobalt complexes, anthraquinones, phenoxazines, phenazines and others. The regeneration of the reduced or oxidised mediators by various methods is discussed, with hydrogen gas, carbon monoxide, formate or a cathode as electron donors, and dimethylsulphoxide, quinones, oxygen or an anode as electron acceptors. The enzymes used, usually in the form of resting cells or crude cell extracts of clostridia or Proteus species are mostly reversible. Examples for preparative reductions as well as for dehydrogenations are given. 相似文献