Effect of Enzymatic Sulfation on Biochemical and Pharmacological Properties of Catecholamines and Tyrosine-Containing Peptides.
作者:Lisa KONISHI-IMAMURA、Dong-Hyun KIM、Kyuichi KOBASHI
DOI:10.1248/cpb.39.2994
日期:——
Substrate specificity of a novel sulfotransferase produced by Eubacterium A-44 isolated from human feces has been studied. Phenolic drugs, catecholamines, were good acceptors of this bacterial enzyme. With regard to dopamine, sulfation mostly occurred at the 4-aromatic hydroxy group.We also investigated the effects of enzymatic sulfaction on pharmacologically active phenolic compounds. Sulfation of phenolic compounds generally led to inactivation (e.g. tyramine and Leu-enkephalin), with the exception of cholecystokinin (CCK) and some gastrointestinal peptides. Proteolytic hydrolysis in vitro did not occur at the C-terminal of the sulfated tyrosine residues of peptices such as Leu-enkephalin and kyotorphin. These results suggest that the sulfation by bacterial enzyme plays an important role in detoxification, activation and stability of phenolic compounds in the human body.
研究人员对从人类粪便中分离出来的 A-44 脂肪酸杆菌所产生的一种新型磺基转移酶的底物特异性进行了研究。酚类药物、儿茶酚胺是这种细菌酶的良好受体。我们还研究了酶硫酸化对具有药理活性的酚类化合物的影响。除了胆囊收缩素(CCK)和一些胃肠肽外,酚类化合物的硫酸化通常会导致失活(如酪胺和亮脑啡肽)。在体外,硫酸化酪氨酸残基(如亮烯脑啡肽和京吗啡)的 C 端不会发生蛋白水解。这些结果表明,细菌酶的硫酸化作用在人体内酚类化合物的解毒、活化和稳定性方面发挥着重要作用。