Oxidation products of com allelochemicals generated by peroxidases or tyrosinases were tested in 10% sucrose solutions for effects on the corn leafhopper Dalbulus maidis. Some reduction in feeding was noted with hydrogen peroxide (a cofactor for peroxidase). Significant reduction in feeding was noted with chlorogenic acid, ferulic acid, p-coumaric acid, and 6-methoxybenzoxazolinone (MBOA), but ...

Tyrosinase-related protein 1 (TYRP1) is one of three tyrosinase-like glycoenzymes in human melanocytes that are key to the production of melanin, the compound responsible for the pigmentation of skin, eye, and hair. Difficulties with producing these enzymes in pure form have hampered the understanding of their activity and the effect of mutations that cause albinism and pigmentation disorders. ...

Tyrosinases are responsible for melanin formation in all life domains. Tyrosinase inhibitors are used for the prevention of severe skin diseases, in skin-whitening creams and to avoid fruit browning, however continued use of many such inhibitors is considered unsafe. In this study we provide conclusive evidence of the inhibition mechanism of two well studied tyrosinase inhibitors, KA (kojic aci...

Abstract Phenolics are vital for the adaptation of plants to terrestrial habitats and species diversity. Phenoloxidases (catechol oxidases, COs, laccases, LACs) responsible oxidation polymerization phenolics. However, their origin, evolution, differential roles during plant development land colonization unclear. We performed phylogeny, domain, amino acids, compositional biases, intron analyses ...

The study described here was undertaken in an effort to determine whether multiple forms of tyrosinase (EC 1.10.3.1) are present in Fundulus heteroclitus during embryonic development. If they are present, do they appear simultaneously in the course of development and do they continue to be produced and maintained without change during the part of the life cycle when tyrosinase should normally b...

Tyrosinase is a type-3 copper protein with six conserved histidine residues within the copper-binding sites. It participates in mollusk nacre formation. Here, we identified nacreous-layer-specific tyrosinases (NLSTyr) from Pinctada fucata martensii ( PmTyr-4 and PmTyr-6 ), as well their homologs maxima PmaxTyr PmaxTyr4 ) margaritifera PmarTyr PmarTyr-4 which encoded without mRNAs were spatially...

Tyrosinase is a natural enzyme and is often purified to only a low degree and it is involved in a variety of functions which mainly catalyse the o-hydroxylation of monophenols into their corresponding o-diphenols and the oxidation of o-diphenols to o-quinones using molecular oxygen, which then polymerizes to form brown or black pigments. The synthesis of o-diphenols is a potentially valuable ca...