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α-GAL (EC 3.2.1.22)广泛存在于动物、植物、微生物和培养细胞中，能专一地催化α半乳糖苷键的水解，主要参与棉子糖、水苏糖、蜜二糖和半乳甘露聚糖等半乳糖苷的降解。α-GAL对于植物种子的萌发至关重要，种子萌发初期，其催化产生的D-半乳糖通过糖酵解途径迅速转化和消耗，为种子的萌发提供最初的能量来源，后期则主要参与细胞壁储藏多糖水解。 测定原理：α-GAL分解对-硝基苯-α-D-吡喃半乳糖苷生成对-硝基苯酚，后者在400nm有最大吸收峰，通过测定吸光值升高速率来计算α-GAL活性。
α-Galactosidase (α-GAL, EC 3.2.1.22) is widely present in animals, plants, microorganisms, and cultured cells. It specifically catalyzes the hydrolysis of α-galactosidic bonds and is primarily involved in the degradation of galactosides such as raffinose, stachyose, melibiose, and galactomannan. α-GAL is crucial for seed germination in plants. During the early stages of germination, the D-galactose it produces is rapidly converted and consumed via the glycolytic pathway, providing the initial energy source for germination. In later stages, it mainly participates in the hydrolysis of cell wall storage polysaccharides. Assay Principle: α-GAL hydrolyzes p-nitrophenyl-α-D-galactopyranoside to generate p-nitrophenol. The latter exhibits a maximum absorption peak at 400 nm, and the activity of α-GAL is calculated by measuring the rate of increase in absorbance at this wavelength.
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