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Lens culinaris β-galactosidase (Lsbgal): Insights into its purification, biochemical characterization and trisaccharides synthesis.
Bioorganic Chemistry ( IF 4.5 ) Pub Date : 2019-12-23 , DOI: 10.1016/j.bioorg.2019.103543
Anjali Yadav 1 , Arvind M Kayastha 1
Affiliation  

Present work describes the purification of an acidic β-galactosidase from Lens culinaris (Lsbgal) to homogeneity via 857 fold with specific activity of 87 U/mg. The molecular mass of purified Lsbgal was estimated ~ 76 kDa by Size Exclusion Chromatography on Superdex-200 (ÄKTA purifier) and on SDS-PAGE, showed hetero-dimeric subunits i.e. 45 kDa and 30 kDa. The purified Lsbgal showed glycoproteinous nature when applied to Con-A Sepharose chromatography. Biochemical studies revealed that optimum condition for purified Lsbgal against o, nitophenyl β-d-galactopyranoside (ONPG) as a substrate was pH 3.0, 58 °C with an activation energy (Ea) 8.1 kcal/mole and Q10 1.8. Lsbgal hydrolyses ONPG with Km value 1.21 mM and Vmax 90.90 µmoles/min/mg. Purified Lsbgal when incubated with high lactose concentration showed transgalactosylation activity which lead to the formation of trisaccharides as a major product of total GOS. Therefore, the purified Lsbgal could be used as potential alternative in food industry and would be further explicated for trisaccharides synthesis.

中文翻译:

扁豆β-半乳糖苷酶(Lsbgal):深入了解其纯化,生化特性和三糖合成。

当前的工作描述了从酸性透镜(Lsbgal)纯化酸性β-半乳糖苷酶(Lsbgal)到857倍,具有87 U / mg的比活性。通过在Superdex-200(ÄKTA纯化器)和SDS-PAGE上的尺寸排阻色谱法,估计纯化的Lsbgal的分子量约为76 kDa,显示出异二聚体亚基,即45 kDa和30 kDa。当纯化的Lsbgal应用于Con-A琼脂糖层析时,显示出糖蛋白性质。生化研究表明,针对邻苯基硝基苯β-d-吡喃半乳糖苷(ONPG)纯化的Lsbgal的最佳条件是pH 3.0、58°C,活化能(Ea)8.1 kcal / mol和Q10 1.8。Lsbgal水解Km值为1.21 mM和Vmax为90.90 µmoles / min / mg的ONPG。纯化的Lsbgal与高乳糖浓度温育时,表现出转半乳糖基化活性,这导致三糖的形成是总GOS的主要产物。因此,纯化的Lsbgal可用作食品工业中的潜在替代品,并将进一步用于三糖的合成。
更新日期:2019-12-23
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