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Methanol Independent Expression by Pichia Pastoris Employing De-repression Technologies
05:30

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Published on: January 23, 2019

Adaptation of Hansenula polymorpha to methanol: a transcriptome analysis.

Tim van Zutphen1, Richard J S Baerends, Kim A Susanna

  • 1Molecular Cell Biology, University of Groningen, Haren, the Netherlands.

BMC Genomics
|January 5, 2010
PubMed
Summary

Methylotrophic yeast like Hansenula polymorpha adapt to methanol by upregulating methanol metabolism and peroxisome biogenesis genes. This study reveals significant transcriptional changes, including autophagy gene induction, during this metabolic shift.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Yeast Genetics

Background:

  • Methylotrophic yeasts, including Hansenula polymorpha, utilize methanol for growth and are key in producing recombinant proteins and studying peroxisome biology.
  • H. polymorpha exhibits distinct peroxisome dynamics: a single small peroxisome on glucose versus multiple enlarged ones on methanol, essential for methanol metabolism.

Purpose of the Study:

  • To investigate transcriptional profile changes in H. polymorpha during adaptation from glucose to methanol-containing media.
  • To understand the molecular mechanisms underlying metabolic adaptation and peroxisome biogenesis in response to methanol.

Main Methods:

  • DNA-microarray analyses were employed to compare gene expression profiles.
  • Cells were cultured on glucose and then shifted to methanol-containing media for analysis.

Main Results:

  • Nearly 20% of H. polymorpha genes were significantly upregulated within two hours of methanol exposure, including key methanol metabolism enzymes like formate dehydrogenase.
  • Genes involved in peroxisome biogenesis (PEX genes) and autophagy (ATG genes) showed moderate to strong upregulation.
  • Conversely, genes related to glycolysis, transcription, and translation were downregulated.

Conclusions:

  • The transcriptional data validate the metabolic shift towards methanol utilization and peroxisome proliferation.
  • Upregulation of autophagy genes suggests a role in cellular remodeling and lipid recycling for methanol growth.
  • Downregulation of transcription and translation likely reflects the slower growth rate observed on methanol compared to glucose.