Discovery and Characterization of Thermophilic Limonene-1,2-Epoxide Hydrolases from Hot Spring Metagenomic LibrariesFerrandi, E.E., Sayer, C., Isupov, M.N., Annovazzi, C., Marchesi, C., Iacobone, G., Peng, X., Bonch-Osmolovskaya, E., Wohlgemuth, R., Littlechild, J.A., Montia, D.
(2015) FEBS J. 282: 2879
- PubMed: 26032250
- DOI: 10.1111/febs.13328
- Primary Citation of Related Structures:
- PubMed Abstract:
The epoxide hydrolases (EHs) represent an attractive option for the synthesis of chiral epoxides and 1,2-diols which are valuable building blocks for the synthesis of several pharmaceutical compounds. A metagenomic approach has been used to identify ...
The epoxide hydrolases (EHs) represent an attractive option for the synthesis of chiral epoxides and 1,2-diols which are valuable building blocks for the synthesis of several pharmaceutical compounds. A metagenomic approach has been used to identify two new members of the atypical EH limonene-1,2-epoxide hydrolase (LEH) family of enzymes. These two LEHs (Tomsk-LEH and CH55-LEH) show EH activities towards different epoxide substrates, differing in most cases from those previously identified for Rhodococcus erythropolis (Re-LEH) in terms of stereoselectivity. Tomsk-LEH and CH55-LEH, both from thermophilic sources, have higher optimal temperatures and apparent melting temperatures than Re-LEH. The new LEH enzymes have been crystallized and their structures solved to high resolution in the native form and in complex with the inhibitor valpromide for Tomsk-LEH and poly(ethylene glycol) for CH55-LEH. The structural analysis has provided insights into the LEH mechanism, substrate specificity and stereoselectivity of these new LEH enzymes, which has been supported by mutagenesis studies.
Istituto di Chimica del Riconoscimento Molecolare, C.N.R., Milano, Italy.