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γ‐Glu‐Met synthesised using a bacterial glutaminase as a potential inhibitor of dipeptidyl peptidase IV
International Journal of Food Science & Technology ( IF 2.6 ) Pub Date : 2017-12-08 , DOI: 10.1111/ijfs.13692
Juan Yang 1 , Dongxiao Sun-Waterhouse 1 , Chun Cui 1 , Keming Dong 2 , Mouming Zhao 1
Affiliation  

This study describes γ‐glutamyl dipeptides as competitive inhibitors of dipeptidyl peptidase‐IV (DPP‐IV), and the feasible synthesis of γ‐Glu‐Met through transpeptidation catalysed by a commercial glutaminase of Bacillus amyloliquefaciens. γ‐Glu‐Met, γ‐Glu‐Leu, γ‐Glu‐Phe, γ‐Glu‐Trp or γ‐Glu‐Tyr exhibited a competitive inhibitory effect on DPP‐IV. The yield of γ‐Glu‐Met was 26.16% under optimised conditions: 200 mm Gln, 20 mm Met, 0.1 U mL−1 enzyme, pH 9.0, 37 °C and reaction time 3 h. For the first time, the side products containing characteristic sequences, that is poly‐γ‐glutamyl short chains with a terminal Met residue (γ‐Glu‐γ‐Glu‐Met and γ‐Glu‐γ‐Glu‐γ‐Glu‐Met) were identified. The superiority of the commercial glutaminase in the synthesis of DPP‐IV‐inhibitory peptides can enable the application of this novel process for manufacturing γ‐glutamyl‐peptides as potential functional ingredients in the type 2 diabetic diet.

中文翻译:

使用细菌谷氨酰胺酶作为二肽基肽酶IV的潜在抑制剂合成的γ-Glu-Met

这项研究描述了γ-谷氨酰二肽作为二肽基肽酶IV(DPP-IV)的竞争性抑制剂,以及通过解淀粉芽孢杆菌的商业谷氨酰胺酶催化的转肽合成γ -Glu-Met的可行方法。γ -Glu-Met,γ -Glu-Leu,γ -Glu-Phe,γ -Glu-Trp或γ -Glu-Tyr对DPP-IV表现出竞争性抑制作用。在最佳条件下,γ -Glu-Met的产率为26.16%:200 m m Gln,20 m m Met,0.1 U mL -1酶,pH 9.0,37°C,反应时间3 h。首次,含有特征序列的副产物,即聚γ谷氨酰短链具有末端Met残基(γ -Glu- γ -Glu-Met和γ -Glu- γ -Glu- γ -Glu-Met的)。商业谷氨酰胺酶在DPP-IV-抑制肽合成中的优越性可以使这种新颖的方法可用于制造γ-谷氨酰肽,作为2型糖尿病饮食中的潜在功能成分。
更新日期:2017-12-08
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