可降解大豆过敏原蛋白酶的纯化与酶学性质
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Purification and Enzyme Characterization of Protease with Anti-Allergic Activity of Soy Sauce
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    摘要:

    将前期筛选获得的芽孢杆菌Bacillus sp. BBE201108发酵培养后,以其发酵上清液作为蛋白酶的粗酶液,经硫酸铵分级沉淀、透析除盐、Q FF 阴离子交换层析和Superdex 75凝胶过滤层析,蛋白酶的比酶活达到2 575.45 U/mg,纯化倍数为10.55,回收率为6.48%,经SDS-PAGE电泳显示为单一条带,该蛋白酶的表观相对分子质量约为46 000。该酶与大豆分离蛋白在pH 8.0,50 ℃下反应30 min,可有效降解β-伴大豆球蛋白的α亚基和α'亚基。在pH 7.0~9.0以及30~40 ℃下的稳定较好;Ca2+存在的情况下,酶活提高了5%左右,而Mn2+、Fe2+和Cu2+在不同程度上对该蛋白酶有抑制作用;苯甲基磺酰氟(PMSF)对该蛋白酶的抑制作用较为显著。酶学性质分析表明,该蛋白酶的Km为4.19 g/L,Vmax为4.04 g/(L·s),Kcat为107.73 s-1,Kcat/Km为25.71 L/(g·s)。

    Abstract:

    The protease isolated from Bacillus sp. BBE201108 was purified using ammonium sulfate fractional precipitation, dialysis, Q FF anion exchange chromatography and Superdex 75 gel filtration chromatograph after fermentation. A purified protease with a recovery of 6.48% had an overall purification of 10.55 fold and a specific enzyme activity of 2 575.45 U/mg. The molecular weight was approximately 46 000 as determined by SDS-PAGE. The α-subunit and α'-subunit of β-conglycinin could be effectively degraded after reaction with the soybean protein isolate (SPI) at pH 8.0 under 50 ℃ for 30 min. The protease was relatively stable over the pH range of 7.0-9.0 at 30~40 ℃. The protease activity enhanced by 5%in the presence of Ca2+, and inhibited by Mn2+, Fe2+ and Cu2+. A significant negative effect of phenylmethanesulfonyl fluoride (PMSF) was observed on the protease activity. The values of Km, Vmax, Kcat and Kcat /Km for the protease were 4.19 g/L, 4.04 g/ (L·s), 107.73 s-1 and 25.71 L/(g·s), respectively.

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付欧,张娟,堵国成,陈坚.可降解大豆过敏原蛋白酶的纯化与酶学性质[J].食品与生物技术学报,2016,35(4):350-356.

FU Ou, ZHANG Juan, DU Guocheng, CHEN Jian. Purification and Enzyme Characterization of Protease with Anti-Allergic Activity of Soy Sauce[J]. Journal of Food Science and Biotechnology,2016,35(4):350-356.

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  • 在线发布日期: 2016-11-01
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