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Deletion the C-terminal peptides of Vibrio harveyi phospholipase D significantly improved its enzymatic properties.
International Journal of Biological Macromolecules 2018 December 12
A novel phospholipase D that originate from marine Vibrio harveyi (VhPLD) was recombinant expressed and biochemically characterized. Moreover, effects of C-terminal peptides on catalytic and interfacial binding properties of VhPLD were investigated by constructing two truncated mutants (VhPLD-Δ(472-483) and VhPLD-Δ(437-483)). Optimal reaction temperature and pH value for wild-type VhPLD (VhPLD-WT) was 45 °C and pH 8.0. However, optimal reaction temperature of VhPLD-Δ(437-483) increased to 50 °C. Meanwhile, catalytic efficiency (kcat /KM ) of VhPLD-Δ(472-483) and VhPLD-Δ(437-483) to the 1,2-Dioctanoyl-sn-glycero-3-phosphatidyl-p-nitrophenol (PpNP) was 12.9 and 14.2 times higher than that of VhPLD-WT. However, when compare the catalytic efficiency between VhPLD-Δ(472-483) and VhPLD-Δ(437-483), no significant change can be found between the two mutants. These results strongly indicated that the C-terminal 12 amino acids (472-483) have important role on the activity of VhPLD. Effects of C-terminal peptides on the interfacial binding properties of VhPLD to different phospholipid monolayers were also investigated by using monolayer film technology. Results of the maximum insertion pressure (MIP) indicated that deletion the C-terminal segment of VhPLD improved its interfacial binding properties to different phospholipid monolayers.
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