One-Armed Artificial Receptors for the Binding of Polar Tetrapeptides in Water: Probing the Substrate Selectivity of a Combinatorial Receptor Library
作者:Carsten Schmuck、Martin Heil
DOI:10.1002/chem.200501062
日期:2006.2.1
We have recently developed a new class of one-armed artificial receptors 1 for the binding of the polar tetrapeptide N-Ac-D-Glu-L-Lys-D-Ala-D-Ala-OH (EKAA) 2 in water using a combined combinatorial and statistical approach. We have now further probed the substrate selectivity of this receptor library 1 by screening a second tetrapeptide substrate (3) with the inverse sequence N-Ac-D-Ala-D-Ala-L-Lys-D-Glu-OH
我们最近开发了一种新型的单臂人工受体1,用于在水中使用极性四肽N-Ac-D-Glu-L-Lys-D-Ala-D-Ala-OH(EKAA)2进行结合。组合和统计相结合的方法。现在,我们通过反序列N-Ac-D-Ala-D-Ala-Lys-D-Glu-OH(AAKE)筛选第二个四肽底物(3),进一步探讨了该受体文库1的底物选择性。 。这种“逆向”底物也被我们的受体有效结合,最佳受体的K(ass)约为6000 M(-1),这是通过定量珠上结合测定以及通过游离的UV和荧光滴定研究确定的。解决方案。因此,反向四肽3的结合效率通常比“正常”肽2(K(ass)约17,000 M(-1))低两到三倍,即使络合主要涉及长距离静电相互作用,并且受体和底物都相当灵活。分子建模和从头算已经用于合理化所观察到的底物选择性并分析复合物中的各种结合相互作用。