Reaction of Trifluoroacetaldehyde with Amino Acids, Nucleotides, Lipid Nucleophiles, and Their Analogs
作者:Hequn Yin、Robert J. Crowder、Jeffrey P. Jones、M. W. Anders
DOI:10.1021/tx950072h
日期:1996.1.1
ifluoromethyl)-1,3- oxathiane, whose formation was accompanied by simultaneous cleavage of the glutamyl moiety. The reactivity of nucleophilic groups with trifluoroacetaldehyde follows the order SH > NH2 > OH. The results of the present study indicate that trifluoroacetaldehyde covalently modifies cellular nucleophiles. The biological significance of these reactions warrants further investigation.
三卤乙醛用作镇静剂,是1,1,1,2-四卤代乙烷代谢的关键中间体,其中一些是氯氟烃替代物,是三卤代乙醇的代谢产物,是肠道和骨髓毒素。在本研究中,使用三氟乙醛作为模型来检查三卤乙醛与细胞亲核试剂(包括氨基酸,核苷酸和脂质成分)的反应。三氟乙醛水合物(10 mM)与氨基酸(100 mM)在pH 7.0和30摄氏度的缓冲液中反应表明,只有L-半胱氨酸形成稳定的加合物,被鉴定为(2R,4R)-和(2S,4R) -2-(三氟甲基)噻唑烷-4-羧酸。(2R,4R)-和(2S,通过同核Overhauser效应实验确定4R)-2-(三氟甲基)噻唑烷-4-羧酸。非对映异构体在37摄氏度时以2.8:1的比例和在80摄氏度时以1:4.0的比例形成。三氟乙醛还与L-半胱氨酸甲酯和2-巯基乙胺反应生成稳定的噻唑烷衍生物,但未与之反应N-乙酰基-L-半胱氨酸。三氟乙醛与ATP,GMP,CMP,L-瓜氨酸和尿素的氨基反