Conformational studies of 3,4-dideoxy furanoid sugar amino acid containing analogs of the receptor binding inhibitor of vasoactive intestinal peptide
作者:Tushar K. Chakraborty、V. Ramakrishna Reddy、G. Sudhakar、S. Uday Kumar、T. Jagadeshwar Reddy、S. Kiran Kumar、Ajit C. Kunwar、Archna Mathur、Rajan Sharma、Neena Gupta、Sudhanand Prasad
DOI:10.1016/j.tet.2004.07.032
日期:2004.9
peptidomimetic analogs 2–4 were synthesized using conformationally constrained scaffolds of 3,4-dideoxy furanoid sugar amino acids (2S,5R)-ddSaa1 5 and its enantiomer (2R,5S)-ddSaa2 6. All these analogs displayed well defined three-dimensional structures akin to that found in 1. Peptides 2 and 3, which differed only in the sugar amino acid stereochemistry, show propensity of structures with identical
血管活性肠肽(VIP)受体结合抑制剂Leu 1 -Met 2 -Tyr 3 -Pro 4 -Thr 5 -Tyr 6 -Leu 7 -Lys 8 1的构象分析通过各种NMR技术和受约束的分子动力学(MD)模拟研究揭示分子具有Tyr 3 -Pro 4 -Thr 5 -Tyr 6部分的回旋结构,在Tyr 6 NH→Tyr 3 CO之间具有分子内氢键。为模拟1的结构,拟肽类似物2– 4是使用3,4-二脱氧呋喃糖氨基酸(2 S,5 R)-ddSaa1 5及其对映体(2 R,5 S)-ddSaa2 6的构象约束支架合成的。所有这些类似物都显示了定义明确的三维结构,类似于1中的结构。仅在糖氨基酸立体化学上不同的肽2和3显示出在ThrNH→MetCO之间具有相同分子内氢键的结构的倾向。在4中观察到TyrNH→MetCO之间具有氢键的相似结构。