Comparison of [5,5,5-2H3]leucine and [ring-2H5]phenylalanine tracers for the measurement of human apolipoprotein B100 kinetics
作者:C. Maugeais、K. Ouguerram、P. Maugeais、C. Simoneau、J. Gardette、T. Magot、M. Krempf
DOI:10.1002/jms.1190300313
日期:1995.3
Incorporation of amino acids labeled with stable isotopes in apoliproproteins is used to estimate kinetic aspects of lipoprotein metabolism. In this study two deuterated tracers, [5,5,5-2H3]leucine and [ring-2H5]phenylalanine, were compared. Isolation and acid hydrolysis of apolipoproteins are required for mass spectrometric analysis. When apolipoprotein B100 of very low density liproproteins was prepared with this procedure, a loss of deuterium was observed on deuterated phenylalanine with 10 and 6 M HCl hydrolysis but not with deuterated leucine or when 4 M HCl hydrolysis was used. This study stre sses the effect of acid hydrolysis on [ring-2H5]phenylalanine. This tracer must be used with caution in studies of specific protein synthesis.
用稳定同位素标记的氨基酸在脂蛋白中的掺入可用于估计脂蛋白代谢的动力学方面。本研究比较了两种氘化示踪剂--[5,5,5-2H3]亮氨酸和[环-2H5]苯丙氨酸。质谱分析需要对脂蛋白进行分离和酸水解。用这种方法制备极低密度脂蛋白的载脂蛋白 B100 时,氘化苯丙氨酸在 10 M 和 6 M HCl 水解过程中会出现氘丢失,但氘化亮氨酸或使用 4 M HCl 水解时不会出现氘丢失。本研究分析了酸水解对[环-2H5]苯丙氨酸的影响。在特异性蛋白质合成研究中必须谨慎使用这种示踪剂。