Isolation and Sequencing of Salsolinol Synthase, an Enzyme Catalyzing Salsolinol Biosynthesis
作者:Xuechai Chen、Xiaotong Zheng、Sakhawat Ali、Minjun Guo、Rugang Zhong、Zixuan Chen、Yongqian Zhang、Hong Qing、Yulin Deng
DOI:10.1021/acschemneuro.8b00023
日期:2018.6.20
enzymatically synthesized by salsolinol synthase from dopamine and acetaldehyde. However, the direct evidence of its biosynthesis was still missing. In this study, we purified salsolinol synthase from rat brain by a systematical procedure involving acid precipitation, ultrafiltration, and hydrophilic interaction chromatography. The molecular weight of salsolinol synthase determined by MALDI-TOF MS is 8622
多巴胺的衍生物Salsolinol(1-甲基-6,7-二羟基-1,2,3,4-四氢异喹啉)被怀疑是多巴胺能神经元变性中最可能的神经毒素。关于其病理生理作用的许多假设已经提出,特别是与帕金森氏病和酒精成瘾有关。在哺乳动物的脑中,Salsolinol合成酶可以由多巴胺和乙醛酶法合成Salsolinol。但是,其生物合成的直接证据仍然缺失。在这项研究中,我们通过涉及酸沉淀,超滤和亲水相互作用色谱的系统程序从鼠脑中纯化了Salsolinol合酶。MALDI-TOF MS测定的Salsolinol合酶的分子量为8622.29 Da,包含77个氨基酸(MQIFVKTLTG KTITLEVEPS DTIKNVKAKI QDKEGIPPDQ QRLIFAGKQL EDGRTLSDYN IQKKSTLHLV LRLRVDY)。同源性分析表明该酶是一种泛素样蛋白,具有四个氨基酸的差异,这表明它是一种新型蛋白。