4.7 Article

Purification, biochemical, and molecular characterization of a novel extracellular thermostable and alkaline α-amylase from Tepidimonas fonticaldi strain HB23

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DOI: 10.1016/j.ijbiomac.2019.03.201

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Tepidimonas fonticaldi; alpha-Amylase; Heterologous-expression; Purification; Hydrolytic pattern; Detergent formulations

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  1. Algerian Ministry of Higher Education and Scientific Research [PNR_code F00220130057/2014-2018, PRFU_code D01N01UN160420180023]

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The present study investigated the purification, biochemical, and molecular characterization of a novel thermostable alpha-amylase (TfAmy48) from Tepidimonas fonticaldi strain HB23. MALDI-TOF/MS analysis indicated that the purified enzyme is a monomer with a molecular mass of 48,138.10 Da. The results from amino-acid sequence analysis revealed high homology between the 25 NH2-terminal residues of TfAmy48 and those of Gammaproteobacteria alpha-amylases. The optimum pH and temperature values for alpha-amylase activity were pH 8 and 80 degrees C, respectively. Thin-layer chromatography (TLC) analysis showed that the final hydrolyzed products of the enzyme from soluble potato starch were maltopentaose, maltose, and maltotriose, which indicate that TfAmy48 possessed an endo-acting pattern. Compared to Termamyl (R) 300 L, TfAmy48 showed extreme stability and tolerance towards organic solvents and excellent compatibility with some commercial laundry detergents. These proprieties make TfAmy48 enzyme a potential candidate as a cleaning bioadditive in detergent composition. The Tfamy48 gene encoding TfAmy48 was cloned, sequenced, and heterologously-expressed in the extracellular fraction of Escherichia coli strain BL21(DE3)pLysS. The biochemical properties of the extracellular purified recombinant enzyme (rTfAmy48) were similar to those of native one. The highest sequence identity value (97%) was obtained with PsAmy1 alpha-amylase from Pseudomonas sp. strain KFCC10818, with only 16 amino add (aa) residues of difference. (C) 2019 Elsevier B.V. All rights reserved.

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