Engineering substrate promiscuity in halophilic alcohol dehydrogenase (HvADH2) by in silico design

PLoS One. 2017 Nov 30;12(11):e0187482. doi: 10.1371/journal.pone.0187482. eCollection 2017.

Abstract

An alcohol dehydrogenase from the halophilic archaeon Haloferax volcanii (HvADH2) has been engineered by rational design to broaden its substrate scope towards the conversion of a range of aromatic substrates, including flurbiprofenol, that is an intermediate of the non-steroidal anti-inflammatory drug, flurbiprofen. Wild-type HvADH2 showed minimal activity with flurbiprofenol (11.1 mU/mg). A homology model of HvADH2 was built and docking experiments with this substrate revealed that the biphenyl rings of flurbiprofenol formed strong interactions with residues F85 and F108, preventing its optimal binding in the active site. Mutations at position 85 however did not increase activity. Site directed mutagenesis at position F108 allowed the identification of three variants showing a significant (up to 2.3-fold) enhancement of activity towards flurbiprofenol, when compared to wild-type HvADH2. Interestingly, F108G variant did not show the classic inhibition in the presence of (R)-enantiomer when tested with rac-1-phenylethanol, underling its potential in racemic resolution of secondary alcohols.

MeSH terms

  • Alcohol Dehydrogenase / chemistry
  • Alcohol Dehydrogenase / genetics
  • Alcohol Dehydrogenase / metabolism*
  • Amino Acid Sequence
  • Computer Simulation
  • Haloferax volcanii / enzymology
  • Hydrogen Bonding
  • Models, Molecular
  • Mutagenesis, Site-Directed
  • Sequence Homology, Amino Acid
  • Substrate Specificity

Substances

  • Alcohol Dehydrogenase

Grants and funding

Funded by Science Foundation Ireland through Synthesis and Solid State Pharmaceutical Centre (grant number 12/RC/2275) to FP and the European Cooperation in Science and Technology (COST Action CM1303 “SysBiocat” grant number ECOST-STSM-CM1303-010614-045245) to JC. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.