Isolation and Characterization of a Hyphomicrobium Species and its Polysaccharide Formation from Methanol

概要

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A microorganism which could utilize methanol as the sole source of carbon and excreted a new polysaccharide was isolated from soil. This isolate was a stalked bacterium which reproduced by a budding process, and could grow on only methanol, formaldehyde or methylamines as the carbon source. The most suitable nitrogen source for growth was the ammonium ion. The optimum pH and temperature for growth were about 7.0 and 30°C, respectively. The cell growth was inhibited by blue light irradiation. Amino acid composition and fatty acid composition of the cells and electrophoretic behavior of methanol dehydrogenase were also studied. On the basis of these properties as well as taxonomical studies, the isolate (strain JTS-811) was identified as belonging to the genus Hyphomicrobium. This strain had different characteristics as compared to those described for other Hyphomicrobium isolates. At present, it is difficult to give a specific name to this strain, because classification of hyphomicrobia is not clear.
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