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13 C‐NMR spectra of whole native cells of Methylobacterium AM1 show dominant signals belonging to poly(β‐hydroxybutyrate) and trehalose. Fractionation of the cells demonstrates that the poly(β‐hydroxybutyrate) is located in the storage granules and that the trehalose is located in the cytosol. The observation of relatively sharp poly(β‐hydroxybutyrate) signals indicates that the polymer granule in this organism is in a mobile rather than truly solid state in vivo.
Barnard et al. (1988) studied this question.