Bioprospecting for Hydroxynitrile Lyases by Blue Native PAGE Coupled HCN Detection

Title:Bioprospecting for Hydroxynitrile Lyases by Blue Native PAGE Coupled HCN Detection

Volume: 4 Issue: 2

Author(s): Elisa Lanfranchi, Eva-Maria Köhler, Barbara Darnhofer, Kerstin Steiner, Ruth Birner-Gruenberger, Anton Glieder and Margit Winkler

Affiliation:

Keywords: Biocatalysis, blue native polyacrylamide gel electrophoresis, cyanogenesis, cyanohydrin, enzyme, hydroxynitrile lyase, oxynitrilase, screening.

Abstract: Hydroxynitrile lyase enzymes (HNLs) catalyze the stereoselective addition of HCN to carbonyl compounds to give valuable chiral hydroxynitriles. The discovery of new sources of HNL activity has been reported several times as the result of extensive screening of diverse plants for cyanogenic activity. Herein we report a two step-method that allows estimation of not only the native size of the active HNL enzyme but also its substrate specificity. Specifically, crude protein extracts from plant tissue are first subjected to blue native-PAGE. The resulting gel is then directly used for an activity assay in which the formation of hydrocyanic acid (HCN) is detected upon the cyanogenesis reaction of any cyanohydrin catalyzed by the enzyme of interest. The same gel may be used with different substrates, thus exploring the enzyme’s substrate scope already on the screening level. In combination with mass spectrometry, sequence information can be retrieved, which is demonstrated with the example of the so far unknown sequence of Prunus domestica HNL.

Cite this article as:

Lanfranchi Elisa, Köhler Eva-Maria, Darnhofer Barbara, Steiner Kerstin, Birner-Gruenberger Ruth, Glieder Anton and Winkler Margit, Bioprospecting for Hydroxynitrile Lyases by Blue Native PAGE Coupled HCN Detection, Current Biotechnology 2015; 4 (2) . https://dx.doi.org/10.2174/2211550104666150506225048