title: Expression level of methanol-inducible peroxisomal proteins and peroxisome morphology are affected by oxygen conditions and mitochondrial respiratory pathway function in the methylotrophic yeast Candida boidinii.
abstract: In the methylotrophic yeast, Candida boidinii, methanol-inducible peroxisomal proteins, for example alcohol oxidase (AOD), dihydroxyacetone synthase (DAS), and peroxisomal glutathione peroxidase (Pmp20), were induced only under aerobic conditions, while expression of PMP47 encoding peroxisomal integral membrane protein Pmp47 was independent of oxygen conditions. Expression of the methanol-inducible peroxisomal enzymes was repressed by inhibition of the mitochondrial respiratory chain. In the respiratory-deficient (ρ0) mutant strain, their induction was at very low levels despite the presence of oxygen, whereas the expression of PMP47 was unaffected. Taken together, these facts indicate that C. boidinii can sense oxygen conditions, and that mitochondrial respiratory function may have a profound effect on induction of methanol-inducible gene expression of peroxisomal proteins. Peroxisome morphology was also affected by oxygen conditions and respiratory function. Under hypoxic conditions or respiration-inhibited conditions, cells induced by methanol contained small peroxisomes, indicating that peroxisome biogenesis and the protein import machinery were not affected by oxygen conditions but that peroxisome morphology was dependent on induction of peroxisomal matrix proteins.
authors: Department of Food Science and Technology, Faculty of Bioindustry, Tokyo University of Agriculture, Abashiri, Hokkaido, Japan.
authors: Shuki
authors: S
authors: Fujimura
authors: Hiroya
authors: H
authors: Yurimoto
authors: Shota
authors: S
authors: Kurimoto
authors: Yoshimi
authors: Y
authors: Matsufuji
authors: Takashi
authors: T
authors: Ito
authors: Takashi
authors: T
authors: Hayakawa
authors: Noboru
authors: N
authors: Tomizuka
authors: Yasuyoshi
authors: Y
authors: Sakai
authors: Tomoyuki
authors: T
authors: Nakagawa
mesh_terms: D002175:Candida / Q000187:drug effects* / Q000201:enzymology* / Q000378:metabolism; D004579:Electron Transport; D020869:Gene Expression Profiling; D000432:Methanol / Q000378:metabolism*; D008928:Mitochondria / Q000201:enzymology*; D010100:Oxygen / Q000378:metabolism*; D020675:Peroxisomes / Q000201:enzymology* / Q000648:ultrastructure*
chemical_list: D010100:Oxygen; D000432:Methanol