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Strategy for purification of aggregation prone b-glucosidases from the cell wall of yeast: a preparative scale approach

机译:从酵母细胞壁中纯化易于凝集的b-葡萄糖苷酶的策略:制备规模方法

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摘要

Purification of biotechnologically important proteins is of vital interest to the biotech industry. b-Glucosidases, belonging to Family 1 and Family 3 of the glycosylhydrolases, have varied applications as carbohydrate hydrolyzing and synthesizing enzymes. Obtaining high quantities of these enzymes is important for exploring their biosynthetic potential, structural information and catalytic activities. Classical methods for their preparation fail to deliver high yields because of adoption of several/ hydroxyapatite chromatography steps. We report here a preparative method for purification of large quantities of two closely related cell bound b-glucosidases (BGL I and BGL II) from Pichia etchellsii that belong to Family 3 glycosylhydrolases. A combination of ion-exchange and gel filtration chromatography was used to process milligram quantities of protein with recoveries of up to 53%. A simple affinity based separation resulted in resolution of BGL I and BGL II with high recovery and high specific activities of 74 IU/mg and 32 IU/mg protein respectively. Peptide sequences of BGL II indicated it to be a novel member of Family 3. Methods reported here present a successful strategy for obtaining large quantities of these enzymes.
机译:生物技术上重要蛋白的纯化对生物技术行业至关重要。属于糖基水解酶的家族1和家族3的b-葡糖苷酶作为碳水化合物水解和合成酶具有多种应用。获得大量的这些酶对于探索其生物合成潜力,结构信息和催化活性至关重要。由于采用了几种羟基磷灰石色谱步骤,传统的制备方法无法提供高收率。我们在这里报告的制备方法纯化的两个紧密相关的细胞结合的b-葡萄糖苷酶(BGL I和BGL II)从属于家庭3糖基水解酶的毕赤酵母。离子交换色谱法和凝胶过滤色谱法的结合用于处理毫克量的蛋白质,回收率高达53%。基于亲和力的简单分离可分离BGL I和BGL II,分别具有74 IU / mg和32 IU / mg蛋白的高回收率和高比活。 BGL II的肽序列表明它是Family 3的新成员。此处报道的方法为获得大量这些酶提供了成功的策略。

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