Structural Investigation of “cis” and “trans” Vinylogous Peptides: <i>cis</i>-Vinylog Turn in Folded <i>cis</i>-Vinylogous Peptides, an Excellent Mimic of the Natural β-Turn
作者:Claude Grison、Philippe Coutrot、Stéphane Genève、Claude Didierjean、Michel Marraud
DOI:10.1021/jo051483y
日期:2005.12.1
Various sequences of modified peptides including those containing a cis- or trans-vinylogous residue have been studied using X-ray diffraction in the solid state and 1H NMR and IR spectroscopy in solution. A cis-vinylogous residue promotes an NH to CO intramolecular H-bond, closing a nine-membered pseudocycle that stabilizes a folded moiety that we proposed to name the cis-vinylogous turn. A trans-vinylogous
使用固态X射线衍射以及溶液中的1 H NMR和IR光谱研究了修饰的肽的各种序列,包括那些含有顺式或反式乙烯基残基的肽。甲顺-vinylogous残基促进了NH到CO分子内氢键,关闭九元pseudocycle的稳定,我们提出以命名折叠部分顺-vinylogous转弯。甲反-vinylogous残基涉及伸展构象。两个连续的乙烯基残基保持其自身的结构倾向:“ Xaa tr ”-“ Xaa cis ”或“ Xaa cis ”-“ Xaa tr”“”序列被单折叠,而“ Xaa cis ”-“ Xaa cis ”序列被双折叠。具有全反式或全顺式或交替的顺式-反式基序的寡聚乙烯可能构成新型的折叠剂。