Enhancing the thermostability of α-L-rhamnosidase from Aspergillus terreus and the enzymatic conversion of rutin to isoquercitrin by adding sorbitol.

Abstract:

BACKGROUND:Thermally stable α-L-rhamnosidase with cleaving terminal α-L-rhamnose activity has great potential in industrial application. Therefore, it is necessary to find a proper method to improve the thermal stability of α-L-rhamnosidase. RESULTS:In this study, addition of sorbitol has been found to increase the thermostability of α-L-rhamnosidase from Aspergillus terreus at temperatures ranging from 65 °C to 80 °C. Half-life and activation free energy with addition of 2.0 M sorbitol at 70 °C were increased by 17.2-fold, 8.2 kJ/mol, respectively. The analyses of the results of fluorescence spectroscopy and CD have indicated that sorbitol helped to protect the tertiary and secondary structure of α-L-rhamnosidase. Moreover, the isoquercitrin yield increased from 60.01 to 96.43% with the addition of 1.5 M of sorbitol at 70 °C. CONCLUSION:Our findings provide an effective approach for enhancing the thermostability of α-L-rhamnosidase from Aspergillus terreus, which makes it a good candidate for industrial processes of isoquercitrin preparation.

journal_name

BMC Biotechnol

journal_title

BMC biotechnology

authors

Ge L,Chen A,Pei J,Zhao L,Fang X,Ding G,Wang Z,Xiao W,Tang F

doi

10.1186/s12896-017-0342-9

subject

Has Abstract

pub_date

2017-02-27 00:00:00

pages

21

issue

1

issn

1472-6750

pii

10.1186/s12896-017-0342-9

journal_volume

17

pub_type

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