The enzyme activity synthesizing poly-β-hydroxybutyrate (PHB) was mainly localized in the PHB-containing particulate fraction ofZoogloea ramigera I-16-M, when it grew flocculatedly in a medium supplemented with glucose. On the other hand, the enzyme activity remained in the soluble fraction, when the bacterium grew dispersedly in a glucose-starved medium.
The soluble PHB synthase activity became associated with the particulate fraction as PHB synthesis was initiated on the addition of glucose to the dispersed culture. Conversely, the enzyme activity was released from the PHB-containing granules to the soluble fraction when the flocculated culture was kept incubated without supplementing the medium with glucose.
PHB synthase was also incorporated into the newly formed PHB fraction when partially purified soluble PHB synthase was incubated withd(-)-β-hydroxybutyryl CoA in vitro.
Although attempts to solubilize the particulate enzyme were unsuccessful, and the soluble enzyme became extremely unstable in advanced stages of purification, both PHB synthases had the same strict substrate specificity ford(-)-β-hydroxybutyryl CoA, and showed the same pH optimum at 7.0.
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Fukui, T., Yoshimoto, A., Matsumoto, M. et al. Enzymatic synthesis of poly-β-hydroxybutyrate inZoogloea ramigera . Arch. Microbiol. 110, 149–156 (1976). https://doi.org/10.1007/BF00690222
- PHB synthase
- Zoogloea ramigera