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Mobilization of Poly(3-Hydroxybutyrate) in Ralstonia eutropha

Authors
  • René Handrick
  • Simone Reinhardt
  • Dieter Jendrossek
Publisher
American Society for Microbiology
Publication Date
Oct 01, 2000
Source
PMC
Keywords
Disciplines
  • Biology
License
Unknown

Abstract

Ralstonia eutropha H16 degraded (mobilized) previously accumulated poly(3-hydroxybutyrate) (PHB) in the absence of an exogenous carbon source and used the degradation products for growth and survival. Isolated native PHB granules of mobilized R. eutropha cells released 3-hydroxybutyrate (3HB) at a threefold higher rate than did control granules of nonmobilized bacteria. No 3HB was released by native PHB granules of recombinant Escherichia coli expressing the PHB biosynthetic genes. Native PHB granules isolated from chromosomal knockout mutants of an intracellular PHB (i-PHB) depolymerase gene of R. eutropha H16 and HF210 showed a reduced but not completely eliminated activity of 3HB release and indicated the presence of i-PHB depolymerase isoenzymes.

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