Abstract:
:Promoter of alcohol oxidase I (PAOX1) is the most efficient promoter involved in the regulation of recombinant protein expression in Pichia pastoris (P. pastoris). PAOX1 is tightly repressed by the presence of glycerol in the culture medium; thus, glycerol must be exhausted before methanol can be taken up by P. pastoris and the expression of the heterologous protein can be induced. In this study, a candidate glycerol transporter (GT1, GeneID: 8197545) was identified, and its role was confirmed by further studies (e.g. bioinformatics analysis, heterologous complementation in Schizosaccharomyces pombe (S. pombe)). When GT1 is co-expressed with enhanced green fluorescent protein (EGFP), it localizes to the membrane and S. pombe carrying gt1 but not the wild-type strain can grow on medium containing glycerol as the sole carbon source. The present study is the first to report that AOX1 in the X-33Δgt1 mutant can achieve constitutive expression in medium containing glycerol; thus, knocking down gt1 can eliminate the glycerol repression of PAOX1 in P. pastoris These results suggest that the glycerol transporter may participate in the process of PAOX1 inhibition in glycerol medium.
journal_name
FEMS Yeast Resjournal_title
FEMS yeast researchauthors
Zhan C,Wang S,Sun Y,Dai X,Liu X,Harvey L,McNeil B,Yang Y,Bai Zdoi
10.1093/femsyr/fow033subject
Has Abstractpub_date
2016-06-01 00:00:00issue
4eissn
1567-1356issn
1567-1364pii
fow033journal_volume
16pub_type
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