Dynamics at the Active Site ofN-(4-Fluorophenyl)-N-(2,6-difluorophenyl) carbamoyl-α-chymotrypsin
作者:Christopher D. Johnson、J. T. Gerig
DOI:10.1002/(sici)1097-458x(199602)34:2<123::aid-omr847>3.0.co;2-l
日期:1996.2
N‐(4‐Fluorophenyl)‐N‐(2,6‐difluorophenyl)carbamoyl chloride was synthesized and used to inactivate the serine protease α‐chymotrypsin. The derivatized enzyme reactivates sufficiently slowly at pH 5.2 that extended fluorine NMR studies of the system are possible. Such studies show that the 4‐fluorophenyl ring can be found in two enzyme environments which are characterized by chemical shifts and relaxation
N-(4-氟苯基)-N-(2,6-二氟苯基)氨基甲酰氯被合成并用于灭活丝氨酸蛋白酶α-胰凝乳蛋白酶。衍生化酶在 pH 5.2 时重新激活足够缓慢,因此可以对系统进行扩展的氟 NMR 研究。此类研究表明,4-氟苯环可以在两种酶环境中找到,其化学位移和弛豫行为与之前报道的相关化合物的工作中获得的化学位移和弛豫行为非常相似。2,6-二氟苯环也存在于两种环境中,二氟芳环的旋转在两种环境中都很慢。饱和转移方法用于估计环境之间的互变速率和芳环旋转速率。用溶解在 8 M 尿素中的蛋白质进行实验,