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Phenoloxidase is a key enzyme of melanization catalyzing the oxidation of phenols. Phenylthiourea (PTU) is the well-known and widely used inhibitor of phenoloxidase. However, the mechanism of its action is not quite clear. In the present work, the effect of PTU on the enzymatic oxidation of 3-(3,4-dihydroxyphenyl)-l-alanine (DOPA) by phenoloxidase was studied by spectrophotometric methods. The inhibition constant of PTU was estimated as 0.21 ± 0.09 µM and the competitive type of inhibition was determined for this reaction.
This article was published in the following journal.
Name: Journal of enzyme inhibition and medicinal chemistry
Numerous attempts have been made to translate mussel adhesion to diverse synthetic platforms. However, the translation remains largely limited to the Dopa (3,4-dihydroxyphenylalanine) or catechol func...
We demonstrate the complete electrochemical oxidation of the biofuel glycerol to CO2 using a hybrid enzymatic and small-molecule catalytic system. Combining an enzyme, oxa-late oxidase, and an organic...
Mucuna pruriens is the best known natural source of L-dopa, the gold standard for treatment of Parkinsonism. M. pruriens varieties are protein rich supplements, and are used as food and fodder worldwi...
The enzymatic oxidation of Fe(II) by nitrate-reducing bacteria was first suggested about two decades ago. It has since been found that most strains are mixotrophic and need an additional organic co-su...
ABSTRACT Our objective was to develop a method mimicking the natural process of coherence in marine mollusks, by direct chemical conversion of protein tyrosine residues to DOPA-o-quinones, which conse...
Medullary thyroid carcinoma (MTC) is a rare tumor arising from C cells of the thyroid gland and belonging to the endocrine tumors. 18F-DOPA PET, based on tha capacity of endocrine tumor ce...
This Phase IIb exploratory study is designed to determine whether AFQ056 is safe and effective and whether it can increase the therapeutic window of L-dopa in patients whose control of the...
OBJECTIVES: I. Characterize inheritance patterns of mutations in patients with beta-oxidation disorders.
Children with congenital hyperinsulinism have low blood sugar, and some of these children may require surgery. In this study, researchers affiliated with the University of Pennsylvania wil...
A new enzymatic assay was developed by NMD Diagnostics for rapid diagnosis of Enteroviral CNS infection. This study will compare this assay to RT-PCR, by testing human CSF samples taken fr...
One of the AROMATIC-L-AMINO-ACID DECARBOXYLASES, this enzyme is responsible for the conversion of dopa to dopamine. It is of clinical importance in the treatment of Parkinson's disease. EC 184.108.40.206.
Isoprostanes derived from the free radical oxidation of ARACHIDONIC ACID. Although similar in structure to enzymatically synthesized prostaglandin F2alpha (DINOPROST), they occur through non-enzymatic oxidation of cell membrane lipids.
An enzyme of the oxidoreductase class that catalyzes the reaction between L-tyrosine, L-dopa, and oxygen to yield L-dopa, dopaquinone, and water. It is a copper protein that acts also on catechols, catalyzing some of the same reactions as CATECHOL OXIDASE. EC 220.127.116.11.
A cytochrome oxidase inhibitor which is a nitridizing agent and an inhibitor of terminal oxidation. (From Merck Index, 12th ed)
An inhibitor of DOPA DECARBOXYLASE, preventing conversion of LEVODOPA to dopamine. It is used in PARKINSON DISEASE to reduce peripheral adverse effects of LEVODOPA. It has no antiparkinson actions by itself.
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Enzymes are proteins that catalyze (i.e., increase the rates of) chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical re...
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