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Tyrosinase inhibitors act on the copper-containing oxidase that catalyzes the first steps of melanin synthesis. Tyrosinase hydroxylates L-tyrosine to L-3,4-dihydroxyphenylalanine (L-DOPA) and oxidizes L-DOPA to dopaquinone, which then forms melanin pigments. Together with the tyrosinase-related proteins, it sets the type and amount of melanin made in mammalian melanocytes. Mushroom tyrosinase from Agaricus bisporus is a common assay enzyme, and its crystal structure with the inhibitor tropolone was reported in 2011. Arbutin, α-arbutin and deoxyarbutin are hydroquinone glycosides used in pigmentation and skin biology research. 4-Butylresorcinol, aloin and the cinnamic acid ester methyl cinnamate are further tyrosinase inhibitors in the list. The list also contains kinase inhibitors such as XMD8-87, which targets tyrosine kinase non-receptor 2 (TNK2).
Tyrosinase-IN-42 is a potent inhibitor of tyrosinase, exhibiting an IC50 of 1.363 µM. This compound demonstrates significant anti-browning effects in fresh-cut apples and exhibits antioxidant properties through scavenging of DPPH and ABTS free radicals, with IC50 values of 57.90 µM and 45.64 µM, respectively. Tyrosinase-IN-42 is useful in research applications focused on food preservation and the study of oxidative stress.
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Taraxinic acid is a potent inhibitor of tyrosinase, an enzyme crucial for melanin biosynthesis. Derived from the roots of Taraxacum flavostylum and Taraxacum lucidum, it exhibits a dose-dependent inhibition of tyrosinase activity, achieving approximately 54.5% inhibition at 50 μg/mL. Additionally, Taraxinic acid demonstrates cytotoxic effects against melanoma cell lines A375 and HTB140 with an IC50 of 83.2 μM, and WM793 with an IC50 of 60.4 μM, indicating significant potential for applications in anticancer research.
FQ is a potent tyrosinase inhibitor, specifically designed to inhibit the diphenolase activity of mushroom tyrosinase, with an IC50 value of 120 μM. This reagent is valuable for research applications focusing on pigmentation processes, allowing investigators to explore the biochemical pathways associated with melanin synthesis and regulation. Its ability to modulate tyrosinase activity makes FQ a critical tool in dermatological and cosmetic research.
Tyrosinase-IN-20 is a potent inhibitor of tyrosinase, exhibiting an IC50 of 28.50 μM. This compound effectively dampens melanin production by inhibiting the enzymatic activity of tyrosinase, making it valuable for research into pigmentation disorders and skin-related applications. Its ability to modulate melanin synthesis allows for exploration in fields such as dermatology and cosmetic formulations.
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Broussoflavonol F is a modulator of the HER2-RAS-MEK-ERK signaling pathway and an inhibitor of mushroom tyrosinase, exhibiting an IC50 of 82.3 μM against the latter. This compound effectively reduces protein expression levels of RAS, HER2, phosphorylated BRAF, phosphorylated MEK, and phosphorylated ERK, leading to the induction of apoptosis and G0/G1 phase cell cycle arrest. It demonstrates notable cytotoxicity against colon cancer cells, making it a valuable tool for research focused on colon cancer and related signaling pathways.
