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Cytochrome Composition and Effect of Catalase on Growth of Agromyces ramnosus

Abstract

Gledhill and Casida1 reported the occurrence in soils of branched, filamentous, catalase negative, cytochrome deficient bacteria for which they proposed a new genus Agromyces in the order Actinomycetales. These bacteria had a predominantly oxidative metabolism and produced little or no H2O2. In our opinion, however, the data suggest the presence of a cytochrome electron transport system. Gledhill and Casida1 deduced its absence from a negative finding in the benzidine test, but in our experience this test is not always sufficiently sensitive to detect cytochromes, especially in the absence of catalase. We have re-examined the strain Agromyces ramnosus ATCC 25173 for the presence of cytochromes using a spectrophotometric procedure.

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References

  1. Gledhill, W. E., and Casida, jun., L. E., Appl. Microbiol., 18, 340 (1969).

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  2. Proom, H., Woiwood, A. J., Barnes, J. M., and Orbell, W. G., J. Gen. Microbiol. 4, 270 (1950).

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  3. Casida, jun., L. E., Appl. Microbiol., 13, 327 (1965).

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JONES, D., WATKINS, J. & MEYER, D. Cytochrome Composition and Effect of Catalase on Growth of Agromyces ramnosus. Nature 226, 1249–1250 (1970). https://doi.org/10.1038/2261249a0

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