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Methanogenic pathways in Methanosphaera stadtmanae.

W M van de Wijngaard1, J Creemers, G D Vogels

  • 1Department of Microbiology, Faculty of Science, University of Nijmegen, The Netherlands.

FEMS Microbiology Letters
|May 15, 1991
PubMed
Summary

Methanosphaera stadtmanae metabolizes methanol to methane, similar to Methanosarcina barkeri. Its inability to reduce CO2 to methane is likely due to inactive enzyme systems involved in carbon dioxide reduction.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Archaea

Background:

  • Methanosphaera stadtmanae is an archaeon known to produce methane.
  • Understanding its metabolic pathways is crucial for comprehending methanogenesis.

Purpose of the Study:

  • To investigate the specific enzymes and pathways involved in methane production by Methanosphaera stadtmanae.
  • To determine the reasons behind its inability to reduce carbon dioxide to methane.

Main Methods:

  • Enzyme activity assays for key methanogenesis enzymes, including 5,10-methylenetetrahydromethanopterin dehydrogenase (MTDH) and reductase (MTR).
  • Analysis of formaldehyde oxidation and reduction pathways.
  • Investigation of cofactor presence, such as methanofuran and pterins.

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Main Results:

  • Methanosphaera stadtmanae exhibits low activities of MTDH and MTR.
  • The organism appears to lack an active CO2 reductase system and methyltetrahydromethanopterin (methyl-H4MPT): coenzyme M methyltransferase.
  • Methanofuran was not detected, but a pterin analogous to H4MPT was identified.

Conclusions:

  • The inability of Methanosphaera stadtmanae to reduce CO2 to methane is attributed to deficiencies in its CO2 reduction system and methyltransferase.
  • The organism utilizes a methanol reduction pathway similar to Methanosarcina barkeri, relying on pterin-based cofactors.