After a period of intense research covering structural, biochemical, theoretical and evolutionary aspects, we have a picture of them as wedge-like copper-dependent metalloenzymes that on reduction generate a radical copper-oxyl species, which cleaves mainly crystalline cellulose.
The above data of substituent effects of the catalyst ligands and phenol monomers strongly support the reaction mechanism of "radical-controlled" oxidative polymerization, in which the coupling of phenoxy radical species would take place from phenoxo-copper II) comphenoxo-copper IInoxy radicomplexper(I) complex 3.
The spin spin interaction in the radical pendant copper complex generated upon one electron oxidation of the copper complex was examined by cw-ESR measurements.
When lignin was used as a major carbon source, enzymes such as copper radical oxidase, isoamyl oxidase, glutathione S-transferase, thioredoxin peroxidase, quinone oxidoreductase, aryl alcohol oxidase, pyranose 2-oxidase, aldehyde dehydrogenase, and alcohol dehydrogenase were expressed and significantly regulated.
Moreover, compound 1b also was a DPPH radical scavenger and copper chelatory as well as had potent neuroprotective effects against glutamate-induced cell death with low toxicity in HT22 cells.
The photoinduced electron transfer reactions of acylphosphine oxide type photoinitiators with Cu II Cl2/N,N,N′,N′′,N′′-pentamethyldiethylenetriamine complex for both atom transfer radical polymerization and copper catalyzed azide-alkyne cycloaddition processes is investigated by laser flash photolysis.
A functional gelable triblock copolymer, poly 2-vinylpyridine -block-poly 3- triethoxysilyl propyl methacrylate)-block-poly 2-vinylpyridine -block-poly 3- triethoxysilyl propylination of reversible addition-fragmentation chain transfer (RAFT) mediated radical poly 2-vinylpyridine -block-poly 3- triethoxysilyl propyl
In the past two years, new alcohol oxidation enzymes were developed through genome-mining and protein engineering, such as new copper radical oxidases with broad substrate scope, alcohol dehydrogenases with altered cofactor preference and a flavin-dependent alcohol oxidase with enhanced oxygen coupling.
Galactose oxidase shares a copper radical oxidase motif with the hydrogen peroxide-generating glyoxal oxidases involved in lignin-degradation in Phanerochaete chrysosporium [86].
