A novel thermophile β-galactosidase from Thermothielavioides terrestris producing galactooligosaccharides from acid whey

被引：35
作者：
Zerva, Anastasia [1 ]
Limnaios, Athanasios [2 ]
Kritikou, Anastasia S. [3 ]
Thomaidis, Nikolaos S. [3 ]
Taoukis, Petros [2 ]
Topakas, Evangelos [1 ]
机构：
[1] Natl Tech Univ Athens, Sch Chem Engn, Biotechnol Lab, 5 Iroon Polytech Str,Zografou Campus, Athens 15780, Greece
[2] Natl Tech Univ Athens, Sch Chem Engn, Lab Food Chem & Technol, 5 Iroon Polytechniou Str,Zorgafou Campus, Athens 15780, Greece
[3] Natl & Kapodistrian Univ Athens, Dept Chem, Analyt Chem Lab, Athens 15771, Greece
来源：
NEW BIOTECHNOLOGY | 2021年 / 63卷
关键词：
Acid whey; -galactosidase; Galactooligosaccharides; Thermothielavioides terrestris; Thermophilic enzymes; MYCELIOPHTHORA-THERMOPHILA; KLUYVEROMYCES-LACTIS; LACTOSE HYDROLYSIS; PROTEINS; IDENTIFICATION; FAMILY;
D O I：
10.1016/j.nbt.2021.03.002
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
?-Galactosidases are key enzymes in the food industry. Apart from the hydrolysis of the saccharide bond of lactose, they also catalyze transgalactosylation reactions, producing galactooligosaccharides (GOS) with prebiotic activity. Here we report the heterologous production in Pichia pastoris of a novel ?-galactosidase from the fungus Thermothielavioides terrestris. The enzyme (TtbGal1) was purified and characterized, showing optimal activity at 60 ?C and pH 4. TtbGal1 is thermostable, retaining almost full activity for 24 h at 50 ?C. It was applied to the production of GOS from defined lactose solutions and acid whey, a liquid waste from the Greek yoghurt industry, reaching yields of 19.4 % and 14.8 %, respectively. HILIC?ESI-QTOF-MS analysis revealed the production of GOS with up to 4 saccharide monomers. The results demonstrate efficient GOS production catalyzed by TtbGal1, valorizing acid whey, a waste with a heavy polluting load from the dairy industry.
引用
收藏
页码：45 / 53
页数：9
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