EPR Study of Substrate Binding to Mn(II) in Hydroxynitrile Lyase from Granulicella tundricola

Femke Vertregt, G. Torrelo Villa, Sarah Trunk, Helmar Wiltsche, Wilfred R. Hagen, Ulf Hanefeld, Kerstin Steiner

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

GtHNL from Granulicella tundricola is a Mn(II) containing hydroxynitrile lyase with a cupin fold. The quasi-octahedral manganese is pentacoordinated by the enzyme. It catalyzes the enantioselective addition of HCN to aldehydes, yielding R-cyanohydrins. On the Lewis acidic vacant coordination site the Mn binds either substrate or the product, leading to a hexacoordinated 17 electron complex. EPR spectra of the active enzyme are unusually wide with a zero-field splitting approximately equal to the X-band microwave energy. A spectral change is induced by incubation with either one of the substrates/products HCN, benzaldehyde, and/or mandelonitrile. This points toward Mn(II) catalyzed cyanohydrin synthesis.

Original languageEnglish
Pages (from-to)5081-5085
Number of pages5
JournalACS Catalysis
Volume6
Issue number8
DOIs
Publication statusPublished - 2016

Keywords

  • cupin
  • cyanohydrin
  • EPR
  • hydroxynitrile lyase
  • Lewis acid catalysis
  • Mn

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