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. 1966 May;91(5):1924–1931. doi: 10.1128/jb.91.5.1924-1931.1966

A Methane-Dependent Coccus, with Notes on Classification and Nomenclature of Obligate, Methane-Utilizing Bacteria

J W Foster a,1, Richard H Davis a
PMCID: PMC316146  PMID: 5937247

Abstract

Foster, J. W. (The University of Texas, Austin), and Richard H. Davis. A methane-dependent coccus, with notes on classification and nomenclature of obligate, methane-utilizing bacteria. J. Bacteriol. 91:1924–1931. 1966.—A new coccus-shaped bacterium capable of aerobic growth at the expense of methane or methanol in a mineral salts medium is described. The organism did not grow at the expense of any of the conventional substrates or homologous hydrocarbons tested. It is gram-negative, nonmotile, and thermotolerant. It grows well at 50 C, optimally at 37 C, but does not grow at 55 C. The cells are encapsulated and have a characteristic diplococcoid arrangement. Washed, “resting-cell” suspensions oxidized certain primary alcohols and short-chain alkanes, an example of “nongrowth oxidation.” Of the methane-C utilized, 86% was “fixed” in organic form; the remainder was oxidized to CO2. The guanine-cytosine content of the extracted deoxyribonucleic acid was 62.5%. Obligate methane-utilizing bacteria are considered as “one-carbon” organisms rather than hydrocarbon utilizers. The assimilation pathway in the obligate methane-methanol bacteria is different from that in the facultative methanol utilizers. Nomenclatural problems arising from the use of the prefix “Methano-” to denote both bacteria that oxidize methane and bacteria that produce methane are discussed. The obligate, one-carbon, methane-methanol bacteria are considered as “methyl” utilizers, and the prefix “Methylo-” is suggested as a solution to the problem of generic cognomens. “Methylococcus capsulatus” gen. n., sp. n. is the name proposed for the new methane coccus.

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Selected References

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