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ORIGINAL ARTICLE
Year : 2018  |  Volume : 14  |  Issue : 59  |  Page : 564-570

Induction studies of a novel α-glucosidase purified from Lactobacillus fermentum grown on resistant starch


Department of Biochemistry, CSIR-Central Food Technological Research Institute, Mysuru, Karnataka, India

Correspondence Address:
Muralikrishna Gudipati
Department of Biochemistry, CSIR-Central Food Technological Research Institute, Mysuru - 570 020, Karnataka
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/pm.pm_328_18

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Aim: The aim of this study is to investigate the induction studies of resistant starch (RS)-degrading enzyme purified from Lactobacillus fermentum. Background: RS is one of the components of dietary fiber and considered as a good prebiotic. Earlier studies from our laboratory reporting L. fermentum to be the most efficient in degrading RS among several lactic acid bacteria tested. L. fermentum produced α-glucosidase when grown on RS, which was purified biochemically and characterized. Results and Discussion: The alpha-glucosidase was synthesized de novo and was repressed by glucose. Known protein synthesis inhibitors such as potassium cyanide, 2,4-dinitrophenol, and tetracycline were found to inhibit α-glucosidase synthesis. Cyclic adenosine 3',5'-monophosphate was found to be a stimulator of α-glucosidase synthesis; however, it did not have any impact on the lag phase. Glutamate acted as an excellent nonrepressing carbon source. Maltooligosaccharides, dextrins, and soluble starch had varied influence on the induction of α-glucosidase synthesis. Conclusion: In the present communication, possible factors regulating α-glucosidase synthesis in L. fermentum were examined and discussed in terms of catabolite and apparent temperature-sensitive repression, culture age, induction, inhibitors, and various carbon sources. Abbreviation used: RS: Resistant starch.


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