Discovery of Type II (Covalent) Inactivation of <i>S</i>-Adenosyl-<scp>l</scp>-homocysteine Hydrolase Involving Its “Hydrolytic Activity”: Synthesis and Evaluation of Dihalohomovinyl Nucleoside Analogues Derived from Adenosine
作者:Stanislaw F. Wnuk、Yue Mao、Chong-Sheng Yuan、Ronald T. Borchardt、Graciela Andrei、Jan Balzarini、Erik De Clercq、Morris J. Robins
DOI:10.1021/jm9801410
日期:1998.7.1
electrophilic acyl halide or alpha-halo ketone species that could undergo nucleophilic attack by proximal groups on the enzyme. Such type II (covalent) mechanism-based inactivation is supported by protein labeling with 8-[3H]-4 and concomitant release of bromide and fluoride ions. Incubation of AdoHcy hydrolase with 7 or 15 resulted in irreversible inactivation and release of bromide ion. In contrast
用“(溴氟代亚甲基)三苯基膦烷”试剂对6-N-苯甲酰基-2',3'-O-异丙基亚氨腺苷(1)进行莫夫氧化而得到的5'-甲醛,然后脱保护,得到9-(6-溴-5) ,6-二脱氧-6-氟-β-d-核糖-六-5-烯呋喃糖基)腺嘌呤(4)。用“二溴亚甲基维蒂希试剂”平行处理并脱保护,得到9-(6,6-二溴-5,6-二脱氧-β-d-核糖-六-5-呋喃呋喃糖基)腺嘌呤(7),也可通过连续制备溴化和6'-溴高movinyl核苷的脱氢溴化。5'-溴高甲酰基类似物11的溴化-脱氢溴化和脱保护得到(E)-9-(5,6-二溴-5,6-dideoxy-beta-d-ribo -hex-5-enofuranosyl)腺嘌呤(15)。将化合物4、7和15设计为具有“水解活性”的假定底物 -腺苷-1-同型半胱氨酸(AdoHcy)水解酶的合成。酶介导的5,6-双键中水的添加可产生亲电酰基卤或α-卤代酮类,它们可能会受到酶上