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新疆鲜蒜中蒜氨酸酶的分离纯化及性质
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摘要
大蒜(Allium Sativum L.)百合科葱属植物,是历史悠久的药食两用植物。它具有杀菌、降血脂、抗血栓、预防中风和高血压、保护肝脏和提高免疫力、抗癌等功效。大蒜中主要的功效物质是由蒜氨酸酶催化裂解蒜氨酸产生的极不稳定的大蒜辣素等含硫化合物。因此,蒜氨酸酶是大蒜产生药用成分的重要生理活性物质。本论文主要工作包括蒜氨蒜酶的分离纯化及其动力学性质的研究。
    将新疆吉木萨尔白皮蒜鳞茎破碎细胞,离心去蒜渣,上清液经硫酸铵分级沉淀,透析脱盐,过葡聚糖G-200凝胶柱等步骤分离纯化蒜氨酸酶,通过酶活性测定和聚丙烯酰胺凝胶电泳检测,确定蒜氨酸酶纯化倍数和分离效果。结果表明,经过上述提纯步骤,获得了纯化14倍的蒜氨酸酶,经SDS-PAGE鉴定,基本为单一组分,分子量为53kD,与文献报道基本一致。
    将分离纯化后的蒜氨酸酶液作为测试液,以蒜氨酸为底物研究了蒜氨酸酶的反应动力学及最适反应条件,确定了该酶最适反应温度为30℃,50℃以下稳定,动力学常数Km=0.693mmol/L、Vm=0.353?mol/min,通过等电聚焦电泳测定其等电点为4.8。采用化学修饰法测定蒜氨酸酶活性中心氨基酸,可推断色氨酸在蒜氨酸酶催化反应中起重要作用。
    本实验从新疆吉木萨尔白皮鲜蒜中分离纯化蒜氨酸酶,并对其性质进行了测定,为今后新疆大蒜的开发利用奠定了基础。
Garlic (Allium Sativum L.) is a number of species of the liliaceae. It was a widely distributed plant and used in all parts of the world not only as a spice and a food, but also as a popular remedy. In addition, it effected on blood coagulation, lipid- and cholesterol-lowering, blood pressure, antithrombic, and anticancer activities were under discussion. Allicin and other sulfur containing compounds were suggested as active compounds in garlic. The extremely unstable allicin itself is liberated from the more stable alliin by the enzyme alliinase if fresh garlic is crunched. Therefore , products of allicin is due to alliinase. This paper included two parts, one part research was to purify the alliinase from fresh garlic, another one was to research optimum reactive conditions and reaction kinetics of alliinase.
    Garlic bulb was blended, the precipitate was removed by centrifugation. Solid ammonium sulphate was added to the supernatant to give 25~55% saturation, and the precipitate was collected by centrifugation, then suspended in the phosphate-glycerol solution. Further purification was achieved by passing samples of the enzyme through sephadex G-200 column. By enzyme assay and gel electrophoresis of alliinase, the results showed that a 14-fold purification of alliinase was obtained, and one most intensive band at Mr =53kD was detected which is in accordance with literature values.
    Purified alliinase optimum reactive conditions and reaction kinetics by alliin as basic substance were studied. The Km and Vm values for enzyme activity on alliin at 35℃ were 0.693mmol/L, 0.353?mol/min, which accords with Michaclis-Menten equation. The optimum temperature for activity was 30℃, range of thermal stability was below 50℃. Isoelectric focusing of alliinase,
    
    
    the major bands were visualized at pH 4.82. Identification of an essential residue in alliinase by chemical modification, the results indicated that Trp residue played an important role in enzyme catalysis.
    We had purified alliinase from fresh garlic, and studied on its properties. This study provided theoretical foundation for development and application of Garlic in xinjiang.
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