Abstract—The investigation of the mechanisms of cytosolic protein degradation is of great fundamental and applied importance. The decrease in the specific activity of formaldehyde dehydrogenase (Fldh1) and formate dehydrogenase (Fdh1) in the wild type strain GS200, the strain with the deletion of the GSS1 hexose sensor gene, and the strain that is defective in autophagy pathway SMD1163 of K. phaffii during short-term and long-term induction with methanol, with or without the addition of the MG132 (proteasome degradation inhibitor), was investigated. It was shown that the duration of cell incubation on methanol had no particular effect on the inactivation of enzymes. The effect of the proteasome inhibitor MG132 was insignificant. Catabolic inactivation of cytosolic and peroxisomal enzymes was damaged in the gss1Δ mutant since glucose signaling was impaired. Fldh1 and Fdh1 are probably degraded via the vacuolar pathway regardless of the duration of methanol induction.
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The study was partially supported by a grant of the Polish National Science Center (NCN) DEC-2012/05/B/NZ1/01657.
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Translated by V. Mittova
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Dmytruk, O.V., Bulbotka, N.V. & Sibirny, A.A. Degradation of Methanol Catabolism Enzymes of Formaldehyde Dehydrogenase and Formate Dehydrogenase in Methylotrophic Yeast Komagataella phaffii . Cytol. Genet. 54, 393–397 (2020). https://doi.org/10.3103/S0095452720050047
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DOI: https://doi.org/10.3103/S0095452720050047