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. 2021 Oct;28(37):51046-51059.
doi: 10.1007/s11356-021-14357-9. Epub 2021 May 11.

Production and structure prediction of amylases from Chlorella vulgaris

Hajer Ben Hlima  1 , Aida Karray  2 , Mouna Dammak  1 , Fatma Elleuch  1 , Philippe Michaud  3 , Imen Fendri  4 , Slim Abdelkafi  5
Affiliations

Production and structure prediction of amylases from Chlorella vulgaris

Hajer Ben Hlima et al. Environ Sci Pollut Res Int. 2021 Oct.

Abstract

Amylases are enzymes required for starch degradation and are naturally produced by many microorganisms. These enzymes are used in several fields such as food processing, beverage, and medicine as well as in the formulation of enzymatic detergents proving their significance in modern biotechnology. In this study, a three-stage growth mode was applied to enhance starch production and amylase detection from Chlorella vulgaris. Stress conditions applied in the second stage of cultivation led to an accumulation of proteins (75% DW) and starch (21% DW) and a decrease in biomass. Amylase activities were detected and they showed high production levels especially on day 3 (35 U/ml) and day 5 (22.5 U/ml) of the second and third stages, respectively. The bioinformatic tools used to seek amylase protein sequences from TSA database of C. vulgaris revealed 7 putative genes encoding for 4 α-amylases, 2 β-amylases, and 1 isoamylase. An in silico investigation showed that these proteins are different in their lengths as well as in their cellular localizations and oligomeric states though they share common features like CSRs of GH13 family or active site of GH14 family. In brief, this study allowed for the production and in silico characterization of amylases from C. vulgaris.

Keywords: Bioinformatic tools; Culture mode; Enzymes; Glycoside hydrolase; Microalgae; Molecular modeling; Starch.

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