mutation network-based understanding of pleiotropic and epistatic mutational behavior of enterococcus faecalis fmn-dependent azoreductase

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ID: 238348
2017
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Abstract
We previously identified a highly active homodimeric FMN-dependent NADH-preferred azoreductase (AzoA) from Enterococcus faecalis, which cleaves the azo bonds (R-N˭N-R) of diverse azo dyes, and determined its crystal structure. The preliminary network-based mutational analysis suggested that the two residues, Arg-21 and Asn-121, have an apparent mutational potential for fine-tuning of AzoA, based on their beneficial pleiotropic feedbacks. However, epistasis between the two promising mutational spots in AzoA has not been obtained in terms of substrate binding and azoreductase activity. In this study, we further quantified, visualized, and described the pleiotropic and/or epistatic behavior of six single or double mutations at the positions, Arg-21 and Asn-121, as a further research endeavor for beneficial fine-tuning of AzoA. Based on this network-based mutational analysis, we showed that pleiotropy and epistasis are common, sensitive, and complex mutational behaviors, depending mainly on the structural and functional responsibility and the physicochemical properties of the residue(s) in AzoA.
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sun2017biochemistrymutation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Jinyan Sun;Ohgew Kweon;Jinshan Jin;Gui-Xin He;Xiyu Li;Carl E. Cerniglia;Huizhong Chen
Journal addictive behaviors reports
Year 2017
DOI
10.1016/j.bbrep.2017.10.008
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