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Microbiology 153 (2007), 1974-1980; DOI  10.1099/mic.0.2007/006098-0
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Microbiology 153 (2007), 1974-1980; DOI  10.1099/mic.0.2007/006098-0
© 2007 Society for General Microbiology

Changes in the redox state and composition of the quinone pool of Escherichia coli during aerobic batch-culture growth

M. Bekker1, G. Kramer2, A. F. Hartog3, M. J. Wagner4, C. G. de Koster2, K. J. Hellingwerf1 and M. J. Teixeira de Mattos1

1 Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
2 Biological Mass-Spectrometry Group, Swammerdam Institute for Life Sciences, BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
3 Biomolecular Synthesis Group, Van't Hoff Institute for Molecular Sciences, Nieuwe Achtergracht 129, 1018 WS Amsterdam, The Netherlands
4 Molecular Cell Physiology Group, Institute of Molecular Cell Biology, Vrije Universiteit, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands

Correspondence
M. J. Teixeira de Mattos
teixeira{at}science.uva.nl

Ubiquinones (UQs) and menaquinones (MKs) perform distinct functions in Escherichia coli. Whereas, in general, UQs are primarily involved in aerobic respiration, the MKs serve as electron carriers in anaerobic respiration. Both UQs and MKs can accept electrons from various dehydrogenases, and may donate electrons to different oxidases. Hence, they play a role in maintaining metabolic flexibility in E. coli whenever this organism has to adapt to conditions with changing redox characteristics, such as oxygen availability. Here, the authors report on the changes in both the size and the redox state of the quinone pool when the environment changes from being well aerated to one with low oxygen availability. It is shown that such transitions are accompanied by a rapid increase in the demethylmenaquinone pool, and a slow increase in the MK pool. Moreover, in exponentially growing cultures in a well-shaken Erlenmeyer flask, it is observed that the assumption of a pseudo-steady state does not hold with respect to the redox state of the quinone pool.

Abbreviations: DMK, demethylmenaquinone; MK, menaquinone; UQ, ubiquinone




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