Aerobic and anaerobic starvation metabolism in methanotrophic bacteria.

Applied and Environmental Microbiology
Peter Roslev, G M King

Abstract

The capacity for anaerobic metabolism of endogenous and selected exogenous substrates in carbon- and energy-starved methanotrophic bacteria was examined. The methanotrophic isolate strain WP 12 survived extended starvation under anoxic conditions while metabolizing 10-fold less endogenous substrate than did parallel cultures starved under oxic conditions. During aerobic starvation, the cell biomass decreased by 25% and protein and lipids were the preferred endogenous substrates. Aerobic protein degradation (24% of total protein) took place almost exclusively during the initial 24 h of starvation. Metabolized carbon was recovered mainly as CO(inf2) during aerobic starvation. In contrast, cell biomass decreased by only 2.4% during anaerobic starvation, and metabolized carbon was recovered mainly as organic solutes in the starvation medium. During anaerobic starvation, only the concentration of intracellular low-molecular-weight compounds decreased, whereas no significant changes were measured for cellular protein, lipids, polysaccharides, and nucleic acids. Strain WP 12 was also capable of a limited anaerobic glucose metabolism in the absence of added electron acceptors. Small amounts of CO(inf2) and organic acids, including acet...Continue Reading

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Citations

Dec 8, 2005·Applied and Environmental Microbiology·Gundula EllerMartin Krüger
Mar 3, 2007·Microbial Ecology·Peter van Bodegom
Oct 1, 2009·Environmental Microbiology Reports·Margarita VecherskayaAlfons J M Stams
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Mar 14, 2012·Applied Microbiology and Biotechnology·Kim HeylenPaul De Vos
Dec 10, 2019·Environmental Microbiology·Sigrid van GrinsvenLaura Villanueva
Apr 14, 2004·Journal of Applied Microbiology·P RoslevM Hesselsoe
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