Exploring castellaniella defragrans linalool (De)hydratase-isomerase for enzymatic hydration of alkenes

Matthias Engleder, Monika Müller, Iwona Kaluzna, Daniel Mink, Martin Schürmann, Erich Leitner, Harald Pichler, Anita Emmerstorfer-Augustin*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

Acyclic monoterpenes constitute a large and highly abundant class of secondary plant metabolites and are, therefore, attractive low-cost raw materials for the chemical industry. To date, numerous biocatalysts for their transformation are known, giving access to highly sought-after monoterpenoids. In view of the high selectivity associated with many of these reactions, the demand for enzymes generating commercially important target molecules is unabated. Here, linalool (de)hydratase-isomerase (Ldi, EC 4.2.1.127) from Castellaniella defragrans was examined for the regio- and stereoselective hydration of the acyclic monoterpene β-myrcene to (S)-(+)-linalool. Expression of the native enzyme in Escherichia coli allowed for identification of bottlenecks limiting enzyme activity, which were investigated by mutating selected residues implied in enzyme assembly and function. Combining these analyses with the recently published 3D structures of Ldi highlighted the precisely coordinated reduction–oxidation state of two cysteine pairs in correct oligomeric assembly and the catalytic mechanism, respectively. Subcellular targeting studies upon fusion of Ldi to different signal sequences revealed the significance of periplasmic localization of the mature enzyme in the heterologous expression host. This study provides biochemical and mechanistic insight into the hydration of β-myrcene, a nonfunctionalized terpene, and emphasizes its potential for access to scarcely available but commercially interesting tertiary alcohols.

Originalspracheenglisch
Aufsatznummer2092
FachzeitschriftMolecules
Jahrgang24
Ausgabenummer11
DOIs
PublikationsstatusVeröffentlicht - 1 Juni 2019

ASJC Scopus subject areas

  • Analytische Chemie
  • Chemie (sonstige)
  • Molekularmedizin
  • Pharmazeutische Wissenschaften
  • Wirkstoffforschung
  • Physikalische und Theoretische Chemie
  • Organische Chemie

Fields of Expertise

  • Human- & Biotechnology

Treatment code (Nähere Zuordnung)

  • Experimental
  • Basic - Fundamental (Grundlagenforschung)

Kooperationen

  • BioTechMed-Graz
  • NAWI Graz

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