Liu B, Cong W, Zhao Y, Zhou H, Zhang J. An inducible Komagataella phaffii system for protein expression using sorbitol dehydrogenase promoter.
Biotechnol Lett 2023;
45:667-677. [PMID:
37074552 DOI:
10.1007/s10529-023-03370-2]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 02/16/2023] [Accepted: 03/31/2023] [Indexed: 04/20/2023]
Abstract
OBJECTIVES
The aim of the present work was to develop a methanol-independent Komagataella phaffii (K. phaffii) strain using a non-methanol promoter.
RESULTS
In this study, the food grade enzyme xylanase from Aspergillus niger ATCC 1015 was used as the reporter protein, a recombinant K. phaffii containing a cascade gene circus was designed and constructed using sorbitol as inducer. Sorbitol induced PSDH leading to MIT1 expression firstly, and heterologous protein xylanase expression finally. This system showed 1.7 fold of xylanase activity at the condition of single copy number of extra MIT1, and 2.1 fold of xylanase activity at condition of multi-copy extra MIT1 gene.
CONCLUSIONS
This sorbitol-induced expression system of K. phaffii avoided toxic and explosive methanol. It was a novel cascade gene expression and a food safety system.
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