Production of a Recombinant α-L-Rhamnosidase from Aspergillus niger CCTCC M 2018240 in Pichia pastoris.

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Production of a Recombinant α-L-Rhamnosidase from Aspergillus niger CCTCC M 2018240 in Pichia pastoris.

Appl Biochem Biotechnol. 2019 Jun 03;:

Authors: Wang D, Zheng P, Chen P

Abstract
α-L-Rhamnosidases have wide application in the field of biotechnology for derhamnosylation of many natural glycosides. In this study, an α-L-rhamnosidase-producing strain, Aspergillus niger CCTCC M 2018240, was isolated from decayed orange peels, and the gene encoding α-L-rhamnosidase was successfully expressed in Pichia pastoris GS115. Three-dimensional structure simulation indicates the enzyme is a member of glycoside hydrolase 78 family. The optimal recombinant strain GS115/pPIC9K-rha-14 exhibited an enzyme activity of 0.47 U/mL when cultured in shaking flasks, and the recombinant α-L-rhamnosidase hydrolyzed α-1,2 and α-1,6 glycosidic bonds in naringin and rutin, respectively, thus generating prunin and isoquercitrin, respectively. Through high density-induced fermentation based on a glycerol feeding strategy in a 3-L bioreactor, the enzyme activity reached 46.87 U/mL after 7 days of methanol incubation, which was approximately 99 times higher than that produced in shaking flasks. This process offers a simple and effective approach for the large-scale production of α-L-rhamnosidase.

PMID: 31161379 [PubMed – as supplied by publisher]

Source: Industry