Poly(3-hydroxyoctanoate) depolymerase from Pseudomonas fluorescens GK13: Catalysis of ester-forming reactions in non-aqueous media
作者:Marta Santos、Joana Gangoiti、María J. Llama、Juan L. Serra、Helmut Keul、Martin Möller
DOI:10.1016/j.molcatb.2012.01.011
日期:2012.5
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 beta-butyrolactone (beta-BL). L- and D-lactide (LLA, DLA) with high yield resulting in low molecular weight polymers. On the other hand, epsilon-caprolactone and pentade-calactone, 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)-beta-BL, LLA and DLA has been studied. (C) 2012 Elsevier B.V. All rights reserved.