Comparison of ADH3 promoter with commonly used promoters for recombinant protein production in Pichia pastoris

Recombinant protein production under the control of the P-ADH3 was compared with Pichia pastoris P-AOX1 and PGAR The single-copy-clones expressing Aspergillus niger xylanase (XylB) gene with the three different promoters were tested in shake flask and 5 L fed-batch fermentation processes. Recombinant protein production with PADH3, P-AOX1 and P-GAP were initiated by addition of ethanol, methanol and glucose, respectively in the culture medium. The fermentation process was carried out for 72 h at 30 degrees C, pH 5 and 30% dissolved oxygen. Extracellular protein production yield for PADH3 (3725 U/mL) was higher than for P-AOX1 (2095 U/mL) and PGAP (580 U/mL) at fermentor scale under the conditions tested. These results show that the PADH3 promoter is a promising tool for large scale production of recombinant proteins and can be an alternative to the P-AOX1 and P-GAR. (C) 2016 Elsevier Inc. All rights reserved.