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Enzymatic property analysis of p53R2 subunit of human ribonucleotide reductase

机译:人核糖核苷酸还原酶p53R2亚基的酶学性质分析

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The enzyme ribonucleotide reductase (RR) (EC 1.17.4.1) can reduce all four ribonucleotides to their corresponding deoxyribonucleotides (dNTP), which are the building blocks for DNA replication and repair in all living cells (Jordan and Reichard, 1998). Human RR is a tetramer composed of two non-identical homodimers, hRRMl and hRRM2 (Rland R2 in mouse). The large subunit hRRMl (87 KD) harbors the catalytic site, allosteric effector-binding sites, and redox active disulfides that participate in the reduction of substrates. The small subunit hRRM2 (43 KD) contains an oxygen-linked diiron center and one tyrosyl radical per monomer, which is essential for enzymatic activity (Jordan and Reichard, 1998; Kauppi et al, 1996).
机译:核糖核苷酸还原酶(RR)(EC 1.17.4.1)可以将所有四个核糖核苷酸还原为相应的脱氧核糖核苷酸(dNTP),这是所有活细胞中DNA复制和修复的基础(Jordan and Reichard,1998)。人RR是由两个不同的同源二聚体,hRRM1和hRRM2(小鼠中的Rland R2)组成的四聚体。大的亚基hRRM1(87 KD)具有参与底物还原的催化位点,变构效应子结合位点和氧化还原活性二硫化物。小亚基hRRM2(43 KD)包含一个与氧连接的二铁中心和每个单体一个酪氨酰基,这对于酶活性至关重要(Jordan和Reichard,1998; Kauppi等,1996)。

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