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Titolo: 3-Hydroxykynurenine as a substrate/activator for mushroom tyrosinase
Autori: 
Data di pubblicazione: 2003
Rivista: 
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS  
Abstract: 3-Hydroxykynurenine is a tryptophan metabolite with an o-aminophenol structure. It is both a tyrosinase activator and a substrate, reducing the lag phase, stimulating the monophenolase activity, and being oxidized to xanthommatin. In the early stage of monophenol hydroxylation, catechol accumulation takes place, whereas 3-hydroxykynurenine is substantially unchanged and no significant amounts of the o-quinone are produced. These results suggest an activating action of 3-hydroxykynurenine toward o-hydroxylation of monophenols. 3-Hydroxykynurenine could therefore well act as a physiological device to control phenolics metabolism to catechols and quinonoids. (C) 2003 Elsevier Science (USA). All rights reserved.
Handle: http://hdl.handle.net/11584/32898
Tipologia:1.1 Articolo in rivista

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