The Extracellular Polysaccharide of a Methylotrophic Culture

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Abstract
The constituent sugars of the extracellular polysaccharide produced by an enrichment culture [Pseudomonas [Methylomonas] methanica], growing on methane as sole C source, were identified as glucose, galactose, mannose, fucose and rhamnose, in the approximate molar ratios of 1.00:0.36:0.19:0.31:0.16. When the culture was grown on methanol as sole C source, only glucose, galactose and mannose, in the approximate molar ratios of 1.00:0.67:0.42, were identified as components of the extracellular polysaccharide. Apparently, a methanol-utilizer, incapable of methane-utilization, produced a polysaccharide which was partially deoxygenated by a methane-utilizer when the 2 organisms were present in a mixed culture growing on methane as sole C source. An alternate possibility, that each polysaccharide was produced by a different organism, is discussed.

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