<scp>DJ</scp>
‐1 is not a deglycase and makes a modest contribution to cellular defense against methylglyoxal damage in neurons
作者:Melissa Conti Mazza、Sarah C. Shuck、Jiusheng Lin、Michael A. Moxley、John Termini、Mark R. Cookson、Mark A. Wilson
DOI:10.1111/jnc.15656
日期:2022.8
Human DJ-1 is a cytoprotective protein whose absence causes Parkinson's disease and is also associated with other diseases. DJ-1 has an established role as a redox-regulated protein that defends against oxidative stress and mitochondrial dysfunction. Multiple studies have suggested that DJ-1 is also a protein/nucleic acid deglycase that plays a key role in the repair of glycation damage caused by methylglyoxal
人 DJ-1 是一种细胞保护蛋白,其缺失会导致帕金森病,并且还与其他疾病有关。DJ-1 作为一种氧化还原调节蛋白具有既定的作用,可抵御氧化应激和线粒体功能障碍。多项研究表明,DJ-1 还是一种蛋白质/核酸去糖酶,在修复由中枢代谢形成的反应性α-酮醛甲基乙二醛 (MG) 引起的糖基化损伤中起关键作用。相互矛盾的报道表明,DJ-1 是一种乙二醛酶,但不是一种去糖酶,并且在糖化防御中不起主要作用。解决这个问题对于了解 DJ-1 如何保护细胞免受可能导致疾病的损伤非常重要。我们发现 DJ-1 在体外降低了 MG 与鸟嘌呤和半胱氨酸的可逆加合物的水平。DJ-1 作用于可逆半硫缩醛底物的稳态动力学与计算动力学模型充分拟合,该模型仅需要 DJ-1 乙二醛酶活性,支持去糖化是 DJ-1 表面活性而非真实活性的结论。灵敏和定量的同位素稀释质谱表明,DJ-1 适度降低了原代和培养的神经元细胞系和整个小鼠大脑中