3,4-Dihydroxybenzylamine: an improved dopamine analog cytotoxic for melanoma cells in part through oxidation products inhibitory to dna polymerase.

3,4-Dihydroxybenzylamine: an improved dopamine analog cytotoxic for melanoma cells in part through oxidation products inhibitory to dna polymerase.
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3,4-二羟基苄胺:一种改进的多巴胺类似物,部分通过抑制 DNA 聚合酶的氧化产物对黑色素瘤细胞具有细胞毒性。

DOI:
10.1111/1523-1747.ep12531751
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发表时间:
1983
期刊:
The Journal of investigative dermatology
影响因子:
--
通讯作者:
Wick,MM
Wick,MM
中科院分区:
--
文献类型:
--
作者:
FitzGerald,GB;Wick,MM

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多巴胺类似物3,4-二羟基苄基苄胺(3,4-DHBA)是一种新型的抗肿瘤药物,它能直接抑制小鼠黑色素瘤S-91 A细胞的DNA聚合酶。与此相反,左旋多巴和多巴胺没有抑制DNA聚合酶在透性细胞在外源性酪氨酸酶的情况下。使用分离的DNA聚合酶的分析表明,邻二羟基化合物的抑制活性完全依赖于酶的活化。邻位衍生物3,4-DHBA通过酪氨酸酶的酶促活化产生两个反应性醌。透析和动力学研究表明,活化的3,4-DHBA对DNA聚合酶的抑制作用涉及不可逆反应,该反应发生在两个抑制剂相互作用位点,如Hill图分析所确定的。双链DNA保护酶免受3,4-DHBA的抑制,表明抑制位点位于或靠近模板-引发剂结合位点。
The dopamine analog 3,4-dihydroxybenzy benzylamine (3,4 DHBA), a novel antitumor agent, was shown to inhibit directly DNA polymerase in cells of the deeply pigmented murine melanoma, S-91A, Permeabilized to nucleotides by lysolecithin. In contrast, levodopa and dopamine did not inhibit DNA polymerase in permeabilised cells in the absence of exogenous tyrosinase. Analysis using isolated DNA polymeras showed that the inhibitory activity of the ortho dihydroxy compounds was totally dependent upon enzymatic activation. The enzymatic activation of the ortho derivative 3,4-DHBA by tyrosinase results in two reactive quinone. Inhibition of DNA polymerase by activated 3,4-DHBA was shown by dialysis and kinetic studies to involve an irreversible reaction which occurs at two inhibitor interaction sites as determined by a Hill plot analysis. Double-stranded DNA protected the enzyme from inhibition by 3,4-DHBA, suggesting that the inhibitory sites are at or near the template-initiator binding site.
DOI: --
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DOI: --
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