Potent anti-tumor effects of an active site mutant of human manganese-superoxide dismutase - Evolutionary conservation of product inhibition
Potent anti-tumor effects of an active site mutant of human manganese-superoxide dismutase - Evolutionary conservation of product inhibition
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DOI：
10.1074/jbc.m310623200
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发表时间：
2004-03-26
影响因子：
4.8
通讯作者：
Nick, HS
中科院分区：
文献类型：
--
作者：
Davis, CA;Hearn, AS;Nick, HS
Mn-SOD serves as the primary cellular defense against oxidative damage by converting superoxide radicals (O-2(radical anion)) to O-2 and H2O2. A unique characteristic of this mitochondrial anti-oxidant enzyme is the conservation from bacteria to man of a rapidly formed product inhibited state. Using site-directed mutagenesis, we have generated an active site mutant (H30N) of human Mn-SOD, which exhibits significantly reduced product inhibition and increased enzymatic efficiency. Overexpression of the H30N enzyme causes anti-proliferative effects in vitro and anti-tumor effects in vivo. Our results provide a teleological basis for the phylogenetically invariant nature of position His-30 and the evolutionary conservation of product inhibition. These data also provide more direct intracellular evidence for the signaling role associated with H2O2.
