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IJBB Vol.45(3) [June 2008] >


Title: Pichia pastoris INO1 gene expression affects intracellular maltase activity and MAL1⁺ gene expression in Schizosaccharomyces pombe
Authors: Chi, Zhengming
Li, Jing
Wang, Lin
He, Susu
Wang, Xianghong
Keywords: MAL1⁺ gene expression
Maltase activity
Schizosaccharomyces pombe
Phosphatidylinositol
Glucose
Issue Date: Jun-2008
Publisher: CSIR
Abstract: In our previous study, we found that the transformant Sch.p944 which contains the plasmid pADH-INO synthesized higher inositol than the transformant Sch.p1025 which contains the plasmid pSPIN-22. In this study, we examined the influence of INO1 gene expression on intracellular maltase activity and MAL1⁺ gene expression in these two transformants. The highest specific maltase activity was observed when Sch.p944 was grown in the synthetic medium containing initial 2.0% (w/v) glucose, whereas glucose repression of maltase activity occurred when Sch.p1025 was cultivated in the same medium containing glucose more than initial 0.5% (w/v), suggesting that synthesis of the maltase was derepressed in Sch.p944. Also, higher mRNA encoding intracellular maltase activity was found in Sch.p944 than that in Sch.p1025 after 32 h of cell growth in the media containing initial 2.0% glucose, indicating that the derepression occurred at the transcriptional level. Furthermore, higher phosphatidylinositol (PI) content was detected in Sch.p944 cells grown in the medium containing initial 2.0% (w/v) glucose for 32 h than in Sch.p1025 cells grown under the same conditions, indicating that PI might be involved in derepression of MAL1⁺ gene expression and intracellular maltase activity.
Page(s): 174-178
ISSN: 0301-1208
Source: IJBB Vol.45(3) [June 2008]

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