ArticleJournal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry2013
Activation mechanism of melB tyrosinase from Aspergillus oryzae by acidic treatment.
Article in Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 17 citations in OpenAlex.
- Modular bismacycles for the selective C-H arylation of phenols and naphthols.Nature chemistry · 2020Article
- Activation of dioxygen by copper metalloproteins and insights from model complexes.Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2017Review
- Copper active sites in biology.Chemical reviews · 2014Review
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8 authors at 2 institutions in 1 country.
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Abstract
The pro form of recombinant tyrosinase from Aspergillus oryzae (melB) shows no catalytic activity, but acid treatment (around pH 3.5) of protyrosinase activates it to induce tyrosinase activity. Circular dichroism spectra, gel filtration analysis, and colorimetric assay have indicated that acid treatment around pH 3.5 induced the disruption of the conformation of the C-terminal domain covering the enzyme active site. These structural changes induced by the acid treatment may open the entrance to the enzyme active site for substrate incorporation. To compare the mechanism of hydroxylation by the acid-treated tyrosinase with that by trypsin-treated tyrosinase, a detailed steady-state kinetic analysis of the phenolase activity was performed by monitoring the O(2)-consumption rate using a Clark-type oxygen electrode. The results clearly show that the phenolase activity (phenol hydroxylation) of the activated tyrosinase involves an electrophilic aromatic substitution mechanism as in the case of mushroom tyrosinase (Yamazaki and Itoh in J. Am. Chem. Soc. 125:13034-13035, 2003) and activated hemocyanin with urea (Morioka et al. in J. Am. Chem. Soc. 128:6788-6789, 2006).
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