Details

Autor(en) / Beteiligte

• König, Burkhard
• Pelka, Mario
• Reichenbach‐Klinke, Roland
• Schelter, Jürgen
• Daub, Jörg

Titel

A Model System for Flavoenzyme Activity − Binding of Flavin and Modulation of Its Redox Potentials through Coordination to a Lewis‐Acidic Azamacrocyclic Zinc(II) Complex

Ist Teil von

• European journal of organic chemistry, 2001-06, Vol.2001 (12), p.2297-2303

Ort / Verlag

Weinheim: WILEY‐VCH Verlag GmbH

Erscheinungsjahr

2001

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The coordination of flavins to Lewis‐acidic zinc(II)cyclen complexes, as a mimic for a metalloprotein binding site, changes their redox properties significantly. The coordination facilitates the electrochemical reduction of the flavin and stabilizes the flavinhydroquinone redox stage, so that a 600 mV more positive potential is necessary for reoxidation. Binding of flavin to the receptor molecule is not restricted to nonpolar solvents and works in methanol. Here, interception of the ECE mechanism of reduction is possible leading to a stabilization of the flavosemiquinone radical anion redox stage, which was proved by its characteristic UV absorption in spectroelectrochemistry. Although it has not yet been observed in flavoproteins, this study shows that flavin binding by coordination to a metal binding site is suitable for cofactor binding and modulation of its redox properties as well as other intermolecular interactions.