目的:探讨熟地黄多糖对荷瘤小鼠肿瘤组织细胞色素C(Cytochrome C,Cyt-C)及天冬氨酸特异性的半胱氨酸蛋白水解酶(cysteinyl aspartate specific proteinases,Caspase-3)基因表达的影响。方法:采用Real-time PCR法检测肿瘤组织中Cyt-C m ...目的:探讨熟地黄多糖对荷瘤小鼠肿瘤组织细胞色素C(Cytochrome C,Cyt-C)及天冬氨酸特异性的半胱氨酸蛋白水解酶(cysteinyl aspartate specific proteinases,Caspase-3)基因表达的影响。方法:采用Real-time PCR法检测肿瘤组织中Cyt-C m RNA及Caspase-3 m RNA的表达情况,采用Western blot法检测Cyt-C及Caspase-3蛋白质的表达情况。结果:熟地黄多糖低剂量组、中剂量组、高剂量组、阳性对照组和联合用药组肿瘤组织中Cyt-C和Caspase-3 m RNA的表达量分别是模型对照组的0.46、0.76;4.82、1.26;0.43、0.60;13.91、4.65;20.17、9.23倍。Cyt-C和Caspase-3蛋白质的表达量分别是模型对照组的0.31、0.90;1.82、1.46;0.62、0.87;2.60、1.54;2.80、1.60倍。结论:熟地黄多糖能促进肿瘤组织中Cyt-C和Caspase-3基因的表达。展开更多
Alkaline phosphatases(APs) are non-specifi c phosphohydrolases, and they are widely used in clinical diagnostics and biological studies. APs are widespread in nature and exhibit dif ferent structural formulations. Bas...Alkaline phosphatases(APs) are non-specifi c phosphohydrolases, and they are widely used in clinical diagnostics and biological studies. APs are widespread in nature and exhibit dif ferent structural formulations. Based on the diversity of biogenetic sources, APs exhibit temperature-propensity traits, and they are classifi ed as psychrophilic, mesophilic, and thermophilic. In this article, the characteristics of psychrophilic APs from marine organisms were described, accompanied by a simple description of APs from other organisms. This review will facilitate better utilization of marine APs in the biotechnology fi eld.展开更多
An extracellular β-glucosidase produced by Aspergillus terreus was identified, purified, characterized and was tested for the hydrolysis of soybean isofiavone. Matrix-assisted laser desorption/ionization with tandem ...An extracellular β-glucosidase produced by Aspergillus terreus was identified, purified, characterized and was tested for the hydrolysis of soybean isofiavone. Matrix-assisted laser desorption/ionization with tandem time-of- flight/time-of-flight mass spectrometry （MALDI-TOF/TOF MS） revealed the protein to be a member of the glycosyl hydrolase family 3 with an apparent molecular mass of about 120 kDa. The purified 13-glucosidase showed optimal activity at pH 5.0 and 65℃ and was very stable at 50℃. Moreover, the enzyme exhibited good stability over pH 3.0-8.0 and possessed high tolerance towards pepsin and trypsin. The kinetic parameters Km （apparent Michaelis- Menten constant） and Vmax （maximal reaction velocity） for p-nitrephenyl-β-D-cjlucopyranoside （pNPG） were 1.73 mmol/L and 42.37 U/mg, respectively. The Krn and Vmax for cellobiose were 4.11 mmol/L and 5.7 U/mg, respectively. The enzyme efficiently converted isoflavone glycosides to aglycones, with a hydrolysis rate of 95.8% for daidzin, 86.7% for genistin, and 72.1% for glycitin. Meanwhile, the productivities were 1.14 mmol/（L.h） for daidzein, 0.72 mmol/（L.h） for genistein, and 0.19 mmol/（L.h） for glycitein. This is the first report on the application of A. terreus β-glucosidase for converting isoflavone glycosides to their aglycones in soybean products.展开更多
文摘目的:探讨熟地黄多糖对荷瘤小鼠肿瘤组织细胞色素C(Cytochrome C,Cyt-C)及天冬氨酸特异性的半胱氨酸蛋白水解酶(cysteinyl aspartate specific proteinases,Caspase-3)基因表达的影响。方法:采用Real-time PCR法检测肿瘤组织中Cyt-C m RNA及Caspase-3 m RNA的表达情况,采用Western blot法检测Cyt-C及Caspase-3蛋白质的表达情况。结果:熟地黄多糖低剂量组、中剂量组、高剂量组、阳性对照组和联合用药组肿瘤组织中Cyt-C和Caspase-3 m RNA的表达量分别是模型对照组的0.46、0.76;4.82、1.26;0.43、0.60;13.91、4.65;20.17、9.23倍。Cyt-C和Caspase-3蛋白质的表达量分别是模型对照组的0.31、0.90;1.82、1.46;0.62、0.87;2.60、1.54;2.80、1.60倍。结论:熟地黄多糖能促进肿瘤组织中Cyt-C和Caspase-3基因的表达。
基金Supported by the National Natural Science Foundation for Creative Research Groups(No.41221004)the Natural Science Foundation of Shandong Province(No.ZR2011DQ005)+6 种基金the Key Laboratory of Marine Ecology and Environmental Science and Engineering,SOA(No.MESE-2013-03)the Key Laboratory for Ecological Environment in Coastal Areas,State Oceanic Administration(No.201306)the Major International Joint Research Project of NSFC(No.41320104008)the Changjiang Scholars Program,Ministry of Education of Chinathe Taishan Scholars Program of Shandong Provincethe Key Lab of Marine Bioactive Substance and Modern Analytical Technique,SOA(No.MBSMAT-2013-05)This is MCTL Contribution No.81
文摘Alkaline phosphatases(APs) are non-specifi c phosphohydrolases, and they are widely used in clinical diagnostics and biological studies. APs are widespread in nature and exhibit dif ferent structural formulations. Based on the diversity of biogenetic sources, APs exhibit temperature-propensity traits, and they are classifi ed as psychrophilic, mesophilic, and thermophilic. In this article, the characteristics of psychrophilic APs from marine organisms were described, accompanied by a simple description of APs from other organisms. This review will facilitate better utilization of marine APs in the biotechnology fi eld.
基金Project supported by the Innovation Team Program of Zhejiang Province(No.2011R50025-12),China
文摘An extracellular β-glucosidase produced by Aspergillus terreus was identified, purified, characterized and was tested for the hydrolysis of soybean isofiavone. Matrix-assisted laser desorption/ionization with tandem time-of- flight/time-of-flight mass spectrometry （MALDI-TOF/TOF MS） revealed the protein to be a member of the glycosyl hydrolase family 3 with an apparent molecular mass of about 120 kDa. The purified 13-glucosidase showed optimal activity at pH 5.0 and 65℃ and was very stable at 50℃. Moreover, the enzyme exhibited good stability over pH 3.0-8.0 and possessed high tolerance towards pepsin and trypsin. The kinetic parameters Km （apparent Michaelis- Menten constant） and Vmax （maximal reaction velocity） for p-nitrephenyl-β-D-cjlucopyranoside （pNPG） were 1.73 mmol/L and 42.37 U/mg, respectively. The Krn and Vmax for cellobiose were 4.11 mmol/L and 5.7 U/mg, respectively. The enzyme efficiently converted isoflavone glycosides to aglycones, with a hydrolysis rate of 95.8% for daidzin, 86.7% for genistin, and 72.1% for glycitin. Meanwhile, the productivities were 1.14 mmol/（L.h） for daidzein, 0.72 mmol/（L.h） for genistein, and 0.19 mmol/（L.h） for glycitein. This is the first report on the application of A. terreus β-glucosidase for converting isoflavone glycosides to their aglycones in soybean products.
