NDLI: Novel extracellular medium-chain-length polyhydroxyalkanoate depolymerase from Streptomyces exfoliatus K10 DSMZ 41693: a promising biocatalyst for the efficient degradation of natural and functionalized mcl-PHAs

Content Provider	Springer Nature Link
Author	Martínez, Virginia Santos, Patricia Gómez García Hidalgo, Javier Hormigo, Daniel Prieto, M. Auxiliadora Arroyo, Miguel Mata, Isabel
Copyright Year	2015
Abstract	Cloning and biochemical characterization of a novel extracellular medium-chain-length polyhydroxyalkanoate (mcl-PHA) depolymerase from Streptomyces exfoliatus K10 DSMZ 41693 are described. The primary structure of the depolymerase (PhaZSex2) includes the lipase consensus sequence (serine-histidine-aspartic acid) which is known for serine hydrolases. Secondary structure analysis shows 7.9 % α-helix, 43.9 % β-sheet, 19.4 % β-turns, and 31.2 % random coil, suggesting that this enzyme belongs to the α/β hydrolase fold family, in agreement with other PHA depolymerases and lipases. The enzyme was efficiently produced as an extracellular active form in Rhodococcus and purified by two consecutive hydrophobic chromatographic steps. Matrix-assisted laser desorption-time-of-flight (MALDI-TOF) analysis of the purified enzyme revealed a monomer of 27.6 kDa with a midpoint transition temperature of 44.2 °C. Remarkably, the activity is significantly enhanced by low concentrations of nonionic and anionic detergents and thermal stability is improved by the presence of 10 % glycerol. PhaZSex2 is an endo-exohydrolase that cleaves both large and small PHA molecules, producing (R)-3-hydroxyoctanoic acid monomers as the main reaction product. Markedly, PhaZSex2 is able to degrade functionalized polymers containing thioester groups in the side chain (PHACOS), releasing functional thioester-based monomers and oligomers demonstrating the potentiality of this novel biocatalyst for the industrial production of enantiopure (R)-3-hydroxyalkanoic acids.
Starting Page	9605
Ending Page	9615
Page Count	11
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	99
Issue Number	22
e-ISSN	14320614
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-10
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Streptomyces exfoliatus Polyhydroxyalkanoate depolymerase 3-Hydroxyalkanoic acids Microbiology Microbial Genetics and Genomics Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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