Molecular Cloning and Characterization of Rat ST1B1 and Human ST1B2 cDNAs, Encoding Thyroid Hormone Sulfotransferases
作者:K.-i. Fujita、K. Nagata、S. Ozawa、H. Sasano、Y. Yamazoe
DOI:10.1093/oxfordjournals.jbchem.a021846
日期:1997.11.1
hormone sulfotransferases have been isolated from their liver cDNA libraries. The isolated sulfotransferases, termed rat ST1B1 and human ST1B2, share 77 and 74% homologies at nucleotide and deduced amino acid levels. These forms showed less than 36 and 56% homologies to hydroxysteroid and aryl sulfotransferases, indicating that they constitute a new gene subfamily of aryl sulfotransferase. Expression
已从其肝脏cDNA文库中分离出编码甲状腺激素磺基转移酶的人和大鼠cDNA。分离的磺基转移酶,称为大鼠ST1B1和人ST1B2,在核苷酸和推导的氨基酸水平上具有77%和74%的同源性。这些形式显示出与羟基类固醇和芳基磺基转移酶的同源性低于36%和56%,表明它们构成了芳基磺基转移酶的新基因亚家族。ST1B1和ST1B2在COS-1细胞中的表达分别导致了33.0和32.5 kDa蛋白质的出现,其迁移率与在大鼠和人类肝脏中使用在大肠杆菌中产生的针对ST1B1和ST1B2的抗体在Western blot中检测到的蛋白质相同。重组形式催化了对硝基苯酚,3,3',5-三碘甲状腺素(T3)和多巴胺的硫酸化,但不是β-雌二醇和脱氢表雄酮。与热稳定的苯酚磺基转移酶ST1A3(表观Km 413 microM)或不耐热的苯酚磺基转移酶ST1A5(表观Km 180 microM)相比,ST1B1和ST1B2显示出