Sequence-Selective Recognition of Peptides within the Single Binding Pocket of a Self-Assembled Coordination Cage
作者:Shohei Tashiro、Masahide Tominaga、Masaki Kawano、Bruno Therrien、Tomoji Ozeki、Makoto Fujita
DOI:10.1021/ja044782y
日期:2005.4.1
The single binding pocket of a self-assembled Pd6L4 coordination cage recognizes oligopeptides in a highly sequence-selective fashion. In particular, the Trp-Trp-Ala sequence is strongly bound by the cavity (Ka >/=106 M-1). Tripeptides possessing the same residues but in different sequences (i.e., Trp-Ala-Trp and Ala-Trp-Trp) show much poorer affinity. Even singly mutated tripeptides with aromatic-aromatic-aliphatic
自组装 Pd6L4 配位笼的单个结合口袋以高度序列选择性的方式识别寡肽。特别是,Trp-Trp-Ala 序列与空腔紧密结合 (Ka >/=106 M-1)。具有相同残基但序列不同的三肽(即 Trp-Ala-Trp 和 Ala-Trp-Trp)显示出更差的亲和力。即使是具有芳香族-芳香族-脂肪族残基序列的单突变三肽(例如,Trp-Trp-Gly 和 Trp-Tyr-Ala)也不能有效识别。X 射线分析和 NMR 显示 Trp-Trp-Ala 序列的所有残基通过 CH-pi 和 pi-pi 相互作用与笼协同相互作用。