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Physiological role of the second alcohol oxidase gene MOD2 in the methylotrophic growth of Pichia methanolica. | LitMetric

AI Article Synopsis

Article Abstract

The methylotrophic yeast Pichia methanolica has nine multiple alcohol oxidase (AOD) isozymes, which can be detected on native electrophoretic polyacrylamide gel and are encoded by two genes, MOD1 and MOD2. The aim of this work is to reveal the physiological roles of these AOD subunits, especially that of Mod2p, encoded by the second AOD-encoding gene, MOD2. A strain expressing only MOD2 showed severe growth inhibition with a low concentration of methanol (0.1%), but its growth was restored with an increase in the methanol concentration (up to 3%). The expression of MOD2 using the CbAOD1 promoter in the Candida boidinii alcohol oxidase-depleted strain was more advantageous for methylotrophic growth with high methanol concentrations than that of MOD1. The expression of MOD2 was not observed under derepression conditions (0% methanol), and the expression level increased with an increase in the methanol concentration used for induction. The expression of MOD1 was observed under derepression conditions and was rather constant throughout the tested methanol concentration range. Therefore, the ratio of Mod2p to Mod1p in an active AOD octamer was proved to be mainly controlled by changes in the MOD2 mRNA level. These and other results show that Mod2p is a unique AOD subunit more adapted to methylotrophic growth with high methanol concentrations (3%) than Mod1p.

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http://dx.doi.org/10.1002/yea.896DOI Listing

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