화학공학소재연구정보센터
Protein Expression and Purification, Vol.136, 14-19, 2017
Recombinant expression of a laccase from Coriolopsis gallica in Pichia pastoris using a modified alpha-factor preproleader
In this work we communicate the heterologous expression of a laccase from Coriolopsis gallica in Pichia pastoris. This enzyme has been reported to efficiently degrade a variety of pollutants such as industrial dyes. The expression strategy included using a previously reported modified alpha-factor preproleader for enhanced secretion and pAOXI, a methanol-responsive promoter. Methanol concentration, copper salts concentration and temperature were varied in order to enhance laccase expression in this heterologous system. A volumetric activity of 250 U/L was achieved after 12-day culture in Fernbach flasks. The protein was recovered from the supernatant and purified, obtaining a preparation with 90% electrophoretic purity. The catalytic constants of the recombinant enzyme are almost identical to the fungal enzyme, thus rendering this system a useful tool for protein engineering of laccase from C. gallica. (C) 2017 Elsevier Inc. All rights reserved.