Effect of NAD(P)H:quinone oxidoreductase on tyrosinase-mediated oxidation of opioid neuropeptides Leu-enkephalin and Met-enkephalin.
Biochem Mol Biol Int
; 37(2): 319-27, 1995 Oct.
Article
em En
| MEDLINE
| ID: mdl-8673015
ABSTRACT
In vitro experiments are reported showing that NAD(P)H(quinone acceptor) oxidoreductase (QR), purified from Glycine max seedlings, reduces Leu- and Met-enkephalin-tyrosinase oxidation products, in the presence of NADH or NADPH. QR was not capable to catalyze the reduction of N-acetyl-dopaquinone formed by the cation of mushroom tyrosinase on N-acetyl-L-tyrosine, while it was able to reduce dopachrome. The results support the hypothesis that QR can inhibit the formation of melanin-like compounds, as catalyzed by the action of tyrosinase on Leu-enkephalin and Met-enkephalin. It is proposed that, in the presence of NAD(P)H as the electron donor, the inhibition occurs by the specific conversion of the dopachrome-derivative into the reduced precursor, leucodopachrome-derivative.
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Base de dados:
MEDLINE
Assunto principal:
Quinona Redutases
/
Glycine max
/
Encefalina Leucina
/
Encefalina Metionina
/
Monofenol Mono-Oxigenase
Idioma:
En
Ano de publicação:
1995
Tipo de documento:
Article