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Functional and molecular characterization of a cold-active lipase from Psychrobacter celer PU3 with potential antibiofilm property. | LitMetric

AI Article Synopsis

Article Abstract

The lipase gene from Psychrobacter celer PU3 was cloned into pET-28a(+) expression vector and overexpressed in E. coli BL21 (DE3) pLysS cells. The purified Psychrobacter celer lipase (PCL) was characterized as an alkaline active enzyme and has a molecular mass of around 30 kDa. The PCL was active even at a low temperature and the optimum range was observed between 10 and 40 °C temperatures. MALDI-TOF and phylogenetic analysis ensured that Psychrobacter celer PU3 lipase (PCL) was closely related to P. aureginosa lipase (PAL). MD simulation results suggest that temperature change did not affect the overall structure of PCL, but it might altered the temperature-dependent PCL functional changes. R (129-135 AA) and R (187-191 AA) regions could be important for temperature-dependent PCL function and they fluctuated much at 35 °C temperature. PMSF completely inhibited PCL lipase activity and it demonstrates the presence of serine residues in the active site of PCL. PCL is moderately halophilic and most of the tested organic solvents found to be inhibiting the lipase activity except the solvents ethanol and methanol. PCL activity was increased with surfactants (SDS and CTAB) and bleaching agents (hydrogen peroxide). The effect of different metal ions on PCL resulted that only mercuric chloride was found as the enhancer of the lipase activity. Antibiofilm property of PCL was evaluated against pathogenic Vibrio parahaemolyticus isolated from the diseased shrimp and MIC value was 500 U. PCL significantly altered the morphology and biofilm density of V. parahaemolyticus and the same was observed through scanning electron microscope (SEM) and confocal laser scanning microscope (CLSM) imaging. RT-PCR analysis revealed that the mRNA expression level of biofilm, colony morphology and major toxin-related (aphA, luxS, opaR, tolC, toxR) genes of V. parahaemolyticus were significantly downregulated with PCL treatment.

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http://dx.doi.org/10.1016/j.ijbiomac.2022.04.174DOI Listing

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