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Journal of Bacteriology, October 2000, p. 5916-5918, Vol. 182, No. 20
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Mobilization of Poly(3-Hydroxybutyrate) in Ralstonia eutropha

René Handrick, Simone Reinhardt, and Dieter Jendrossek*

Institut für Mikrobiologie, Universität Stuttgart, 70550 Stuttgart, Germany

Received 17 April 2000/Accepted 19 July 2000

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.

* Corresponding author. Mailing address: Institut für Mikrobiologie, Universität Stuttgart, Allmandring 31, 70550 Stuttgart, Germany. Phone: 49-711-685-5483. Fax: 49-711-685-5725. E-mail: dieter.jendrossek{at}po.uni-stuttgart.de.

Journal of Bacteriology, October 2000, p. 5916-5918, Vol. 182, No. 20
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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