کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5156479 | 1500581 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Levan-type fructooligosaccharides synthesis by a levansucrase-endolevanase fusion enzyme (LevB1SacB)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We describe here the enzymatic production of levan type-fructooligosaccharides (L-FOS) with a DP from 2 to 10, through simultaneous synthesis and hydrolysis reactions. This was accomplished by LevB1SacB, a new enzyme resulting from the fusion of SacB, a levansucrase from Bacillus subtilis and LevB1, an endolevanase from B. licheniformis. In the fusion enzyme, SacB retains its catalytic behavior with a decrease in kcat from 164 to 108Â sâ1. LevB1 in LevB1SacB kinetic behavior improves considerably reaching saturation with levan and following Michaelis-Menten kinetics, quite differently from the previously reported first order kinetic behavior. We also report that LevB1SacB or both enzymes (LevB1 & SacB) at equimolar concentrations in simultaneous reactions result in an optimal, wide and diverse L-FOS profile, including 6-kestose, levanbiose and blastose among other L-FOS and 1-kestose, which accumulates as by-product of SacB levan synthesis. Yields of around 40% (w/w) were obtained from 600Â g/l sucrose with either LevB1SacB or LevB1 & SacB. The reaction was successfully scaled up to a stirred 2Â l bioreactor.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 177, 1 December 2017, Pages 40-48
Journal: Carbohydrate Polymers - Volume 177, 1 December 2017, Pages 40-48
نویسندگان
Jaime R. Porras-DomÃnguez, MarÃa Elena RodrÃguez-AlegrÃa, Ángela Ávila-Fernández, Silvia Montiel-Salgado, AgustÃn López-MunguÃa,