Role of Pyridine Hydrogen-Bonding Sites in Recognition of Basic Amino Acid Side Chains
作者:Thomas W. Bell、Alisher B. Khasanov、Michael G. B. Drew
DOI:10.1021/ja0273694
日期:2002.11.1
Complexation studies were conducted in methanol by (1)H NMR titration for several guanidinium and ammonium guests, including derivatives of the amino acids arginine and lysine. Receptor 5 binds all such guests weakly (K(s) < 4000), while 3 binds most guests very strongly (K(s) > 100 000). Receptor 3 is selective for arginine versus lysine, while 4 binds lysine better than does 3. The results generally underscore
已经合成了一系列三种新的胍和铵客体人工受体。所有三种受体都具有高度预先组织的裂缝,带有两个羧酸盐基团。它们的裂缝中包含的氮原子数量不同,如下所示:受体 3 中有四个 N 原子,4 中有三个 N 原子,5 中有两个氮原子。 晶体学研究产生了以下胍络合物的固态结构每个受体:3.2CH(3)CH(2)NHC(NH(2))(2)(+)、4.2CH(3)NHC(NH(2))(2)(+)和5.2C(NH (2))(3)(+)。所有三种复合物中受体分子的构象都非常相似。N-烷基胍客体以类似的方式结合在 3 和 4 的裂缝中,尽管 4 中失去了一个氢键受体氮,并且可能会受到 CH 基团的阻碍。在5的胍络合物中,没有客体进入含有两个 CH 基团的空腔。通过 (1) H NMR 滴定在甲醇中对几种胍和铵客体进行络合研究,包括氨基酸精氨酸和赖氨酸的衍生物。受体 5 与所有这些客体结合较弱(K(s) < 4000),而受体
Methods and kits for the detection of arginine compounds
申请人:——
公开号:US20020081626A1
公开(公告)日:2002-06-27
Methods and kits for determine arginine compounds are discussed. The methods and kits of the invention can be used for the diagnosis of arginine compound associated disorders.
本文讨论了测定精氨酸化合物的方法和试剂盒。本发明的方法和试剂盒可用于诊断与精氨酸化合物相关的疾病。
US6525200B1
申请人:——
公开号:US6525200B1
公开(公告)日:2003-02-25
US6720188B2
申请人:——
公开号:US6720188B2
公开(公告)日:2004-04-13
A Small-Molecule Guanidinium Receptor: The Arginine Cork
作者:Thomas W. Bell、Alisher B. Khasanov、Michael G. B. Drew、Anton Filikov、Thomas L. James
preorganized, artificial receptor for guanidiniumcations binds arginine with high affinity in polar solvents, even in water! The X-ray crystal structure of its bis(N-ethylguanidinium) complex shows the formation of hydrogen bonds between the receptor and the guest (see picture). This observation explains the strength of the complex formed with the dipeptide diarginine (K(d)=50 µM in H(2)O).