Download MendeleyA New Thermophilic Ene-Reductase from the Filamentous Anoxygenic Phototrophic Bacterium Chloroflexus aggregans .
Robescu, M.S., Niero, M., Loprete, G., Cendron, L., Bergantino, E.(2021) Microorganisms 9
- PubMed: 33925162
- DOI: https://doi.org/10.3390/microorganisms9050953
- Primary Citation of Related Structures:
7O0T - PubMed Abstract:
Aiming at expanding the biocatalytic toolbox of ene-reductase enzymes, we decided to explore photosynthetic extremophile microorganisms as unique reservoir of (new) biocatalytic activities. We selected a new thermophilic ene-reductase homologue in Chloroflexus aggregans , a peculiar filamentous bacterium. We report here on the functional and structural characterization of this new enzyme, which we called Ca OYE. Produced in high yields in recombinant form, it proved to be a robust biocatalyst showing high thermostability, good solvent tolerance and a wide range of pH optimum. In a preliminary screening, Ca OYE displayed a restricted substrate spectrum (with generally lower activities compared to other ene-reductases); however, given the amazing metabolic ductility and versatility of Chloroflexus aggregans , further investigations could pinpoint peculiar chemical activities. X-ray crystal structure has been determined, revealing conserved features of Class III (or thermophilic-like group) of the family of Old Yellow Enzymes: in the crystal packing, the enzyme was found to assemble as dimer even if it behaves as a monomer in solution. The description of Ca OYE catalytic properties and crystal structure provides new details useful for enlarging knowledge, development and application of this class of enzymes.
Organizational Affiliation:
Department of Biology, University of Padova, Viale G. Colombo 3, 35131 Padova, Italy.
