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Mouse melanoma tyrosinases exist in the cytoplasm of melanocytes and also in a particulate form, bound to melanosomes. The cytosolic isoenzyme activity is not expressed in the melanocytes in vivo. One of the mechanisms for the activity regulation is the existence of a soluble inhibitor. This inhibition is non-competitive with regard to L-dopa. Particulate tyrosinase can be solubilized from the melanosome by several agents, Brij 35 and Triton X-100 being the most effective ones. Melanin accumulation in the organelle produces a competitive inhibition of the activity.
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