This article describes oxidising enzymes used for biocatalytic applications.
Graphite electrodes modified with a redox polymer, [Os(4,4′- dimethoxy-2,2′-bipyridine)2 polyvinyl imidazole)10Cl]Cl (E°′ = −0.02 V vs Ag/AgCl), crosslinked with glucose oxidising enzymes and various amounts of multi-walled carbon nanotubes are investigated for current generation in the presence of glucose in physiological buffer solutions.
The 2OG-FeII oxygenase superfamily is widespread in Eukaryotes and bacteria [ 1], and is currently the largest known family of oxidising enzymes without a heme group [ 5].
For example, the activity of cytochrome P450 (CYP) 3A4/5, the major oxidising enzymes for many cytotoxic drugs varies by as much as 50-fold (Wrighton et al, 1996).
Apart from the comparatively short polyketide chain (seven modules) we found five genes (abyA1– assignedssigned to enzymes catalysing formation of the tetronic acid moiety and three genes coding for oxidising enzymes (abypE, abyX and abyV).
Genes encoding different oxidising enzymes including the cytochrome P450 family (CYP2E1, CYP2A19, CYP2C49, CYP27A1 and CYP2C33) and the flavin-containing monooxygenase family (FMO1 and KMO) were significantly differentially expressed.
In contrast, on the basis of the fact that activities of oxidising enzymes in the gut are much lower than in the liver (Doherty and Charman, 2002), the ability of the gut mucosa to O-demethylate or hydroxylate DMU 212 is arguably much lower than its ability to biotransform resveratrol by conjugation.
Electrochemical analysis established that Hyd-5 is a H2-oxidising enzyme that functions in very low levels of H2 and sustains this activity in high levels of O2.
Similar to the use of other sugar-oxidising redox enzymes in biosensors and biofuel cells [ 129– 136], the "wiring" of various CDHs with Os-redox polymers accepting electrons direct from the DHCDH is very promising for obtaining high current densities at low potentials [ 46, 90, 91, 93, 125].
Aldehyde dehydrogenase isoform 1A1 (anDH1A1), an enzyme oxidising aliphatic aldehydes, has been also recognised as a universal marker of CSCs (Marcato et al, 2011) and has become target of therapeutic intervention (Visus et al, 2011).
