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Transcriptional down-regulation of peroxisome numbers affects selective peroxisome degradation in Hansenula polymorpha

Leao-Helder, A. N., Krikken, A. M., van der Klei, I. J., Kiel, J. A. K. W. & Veenhuis, M., 17-Oct-2003, In : The Journal of Biological Chemistry. 278, 42, p. 40749-40756 8 p.

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DOI

We have isolated and characterized a novel transcription factor of Hansenula polymorpha that is involved in the regulation of peroxisomal protein levels. This protein, designated Mpp1p, belongs to the family of Zn(II)(2)Cys(6) proteins. In cells deleted for the function of Mpp1p the levels of various proteins involved in peroxisome biogenesis (peroxins) and function ( enzymes) are reduced compared with wild type or, in the case of the matrix protein dihydroxyacetone synthase, fully absent. Also, upon induction of mpp1 cells on methanol, the number of peroxisomes was strongly reduced relative to wild type cells and generally amounted to one organelle per cell. Remarkably, this single organelle was not susceptible to selective peroxisome degradation (pexophagy) and remained unaffected during exposure of methanol-induced cells to excess glucose conditions. We show that this mechanism is a general phenomenon in H. polymorpha in the case of cells that contain only a single peroxisome.

Original languageEnglish
Pages (from-to)40749-40756
Number of pages8
JournalThe Journal of Biological Chemistry
Volume278
Issue number42
Publication statusPublished - 17-Oct-2003

    Keywords

  • Aldehyde-Ketone Transferases, Amino Acid Sequence, Cloning, Molecular, DNA, Down-Regulation, Glucose, Green Fluorescent Proteins, Luminescent Proteins, Methanol, Molecular Sequence Data, Mutagenesis, Mutation, Peroxisomes, Pichia, Recombinant Fusion Proteins, Sequence Homology, Amino Acid, Time Factors, Transcription Factors, Transcription, Genetic, Zinc, Zinc Fingers

ID: 4135132