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Poly(3-hydroxyoctanoate) depolymerase fromPseudomonas fluorescensGK13: Catalysis of ester-forming reactions in non-aqueous media

Authors
Journal
Journal of Molecular Catalysis B Enzymatic
1381-1177
Publisher
Elsevier
Volume
77
Identifiers
DOI: 10.1016/j.molcatb.2012.01.011
Keywords
  • Pseudomonas Fluorescensgk13
  • Extracellular Mcl-Pha Depolymerase
  • Enzymatic Ring-Opening Polymerization
  • Novozyme 435
Disciplines
  • Biology

Abstract

Abstract Several industrial processes based on lipase catalysis have been established. However, since there are still a vast number of catalytic processes that lack a suitable enzyme, the discovery of new biocatalysts is required to fulfil this purpose. The potential of using the medium-chain-length (mcl)-PHA depolymerase from Pseudomonas fluorescens GK13 in anhydrous media to catalyze ester-forming reactions has been investigated and compared with that of Novozyme 435. The mcl-PHA depolymerase catalyzes the ring-opening polymerization of racemic β-butyrolactone (β-BL), l- and d-lactide (LLA, DLA) with high yield resulting in low molecular weight polymers. On the other hand, ɛ-caprolactone and pentadecalactone, which show high polymerizability using Novozyme 435 as catalyst, were not polymerized by mcl-PHA depolymerase. Besides, the activity of mcl-PHA depolymerase toward transesterification and esterification of ethyl-3-hydroxyoctanoate, lauric acid, (R,S)-β-BL, LLA and DLA has been studied.

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