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Substitution Of Residues In Ureg To Investigate Uree Interactions And Nickel Binding In A Predominant Urease Gene Cluster From The Ruminal Metagenome

文献类型： 外文期刊

作者： Zhang, XY; Zhao, SG; He, Y; Zheng, N; Yan, XH; Wang, JQ

作者机构：

关键词： Ureg; Uree; Nickel Binding; Protein Interaction; Rumen; Urease

期刊名称： INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

ISSN： 0141-8130

年卷期： 2020 年 161 卷

页码：

收录情况： JCR（2021版）

摘要： Microbial ureases catalyze the hydrolysis of urea to ammonia, and inhibition of these enzymes in rumen has the potential to improve urea utilization efficiency and reduce urinary nitrogen excretion. Urease activity is catalyzed by a protein complex encoded by a gene cluster, and its accessory proteins (especially UreE and UreG) play important roles in transferring nickel to the active site for urease maturation. In this study, a predominant urease gene cluster (5290 bp) from the ruminal microbial metagenome was identified. Isothermal titration calorimetry (ITC) and analytical ultracentrifugation (AUC) analyses showed that the reaction of identified UreE with UreG was endothermic, and was dominated by a hydrophobic interaction, in which each UreE dimer bound 2 M equivalents of UreG monomer to form a UreE2-2UreG complex. Mutagenesis analyses showed that the UreG residues Glu-23, Asp-41, Glu-46, Glu-66, Cys-70, His-72, Asp-78, and Asp-118 were involved in the GTPase activity of UreG. Furthermore, variants of Cys-70 and His-72 involved in CPH motif of UreG, as well as the nearby Glu-66 and Asp-78, not only prevented interactions with UreE, but also prevented nickel binding. These data provide additional information regarding UreG residues that may be targeted for the design of new urease inhibitors. (c) 2020 Elsevier B.V. All rights reserved.

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