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Quantification of Ca2+ binding to melanin supports the hypothesis that melanosomes serve a functional role in regulating calcium homeostasis

机译:Ca2 +与黑色素结合的定量支持以下假设:黑素体在调节钙稳态中起功能性作用

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Calcium regulation in melanocytes affects numerous biological pathways including protecting the redox balance in the cell and regulating the supply of substrate, L-tyrosine, for melanogenesis. The pigment contained in the melanocytes, melanin, has been implicated in maintaining calcium homeostasis in the cell and is known to be involved with calcium ion regulation in the inner ear. Herein, the association constant for Ca2+ binding to Sepia melanin is determined by isothermal titration calorimetry to be 3.3 (+/- 0.2) x 10(3)/M. This value is comparable with other well-established intracellular calcium-binding proteins that serve to buffer calcium concentrations, lending further support to the hypothesis that melanosomes serve as intracellular mediators of calcium homeostasis in melanocytes. Using this binding constant and the data from a fluorescent Ca2+ displacement assay, the pK. of the carboxyl group coordinated to Ca2+ is determined to be 3.1 +/- 0.1.
机译:黑色素细胞中的钙调节影响许多生物学途径,包括保护细胞中的氧化还原平衡和调节用于黑色素生成的底物L-酪氨酸的供应。黑色素细胞中含有的色素黑色素与维持细胞内钙稳态有关,已知与内耳钙离子调节有关。在本文中,通过等温滴定量热法测定Ca 2+与棕褐色黑色素结合的缔合常数为3.3(+/- 0.2)x 10(3)/ M。该值可与用于缓冲钙浓度的其他公认的细胞内钙结合蛋白相媲美,从而进一步支持了黑素体在黑素细胞中充当钙稳态的细胞内介体的假设。使用该结合常数和荧光Ca2 +置换测定的数据pK。确定与Ca 2+配位的羧基的C 3为3.1 +/- 0.1。

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