Use of a purified β-glucosidase from microorganisms associated coral to enhance wine aroma.

BACKGROUND Beta-Glucosidases (3.2.1.21) play essential roles in the removal of nonreducing terminal glucosyl residues from saccharides and glycosides. However, the full potential and different applications of recombinant high-yield microbial β-glucosidase-producing systems remain to be tackled. RESULTS A β-glucosidase gene designated as Mg132 was isolated from a coral microorganism by high-throughput sequencing and functional screening. The deduced amino acid sequences of Mg132 showed a highest identity of 97% with β-glucosidase predicted in the GenBank database. This gene was cloned and overexpressed in Escherichia coli BL21 (DE3) for the first time. The optimal pH and temperature of purified recombinant Mg132 were 8.0 and 50 °C, respectively. It exhibited a high level of stability at high concentration of glucose and ethanol, and glucose concentrations below 300 mM distinctly stimulated p-nitrophenyl-β-D-glucopyranoside hydrolysis, reaching 200% at 15% ethanol. The Km and Vmax values were 0.293 mM and 320 μmol min-1  mg-1 , respectively, while using p-nitrophenyl-β-D-glucopyranoside as a substrate. Wine treated with Mg132 had an obvious positive catalytic specificity for glycosides, which give a pleasant flavor of temperate fruity and floral aromas. The total concentration of fermentative volatiles was 201.42 ± 10.22 μg·L-1 following Mg132 treatment and 99.21 ± 7.72 μg·L-1 in control samples. CONCLUSION Good tolerance of winemaking and aroma fermentative properties suggest that Mg132 has potential application in aroma enhancement in wine for the further study. This article is protected by copyright. All rights reserved.

• Publication year

  2021

• Venue

  The Journal of the Science of Food and Agriculture

• Publication date

  2021-11-28

• Fields of study

  Biology, Medicine, Chemistry, Environmental Science

• Identifiers
  DOI 10.1002/jsfa.11694PMID 34841541
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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