Linear oligopeptides. Part 352. Synthesis, characterization and solution conformational analysis of C<sup>α</sup>-methyl-homo-phenylalanine [(αMe)Hph] containing peptides
作者:Alessandra Polese、Fernando Formaggio、Marco Crisma、Gian Maria Bonora、Claudio Toniolo、Quirinus B. Broxterman、Johan Kamphuis
DOI:10.1039/p29960000833
日期:——
the pentapeptide level) of the sterically demanding Cα-methyl-homo-phenylalanine, (αMe)Hph, residue have been synthesized (by solution methods) and fully characterized. The results of a solution conformational analysis, performed by using FTIR and 1H NMR spectroscopies, favour the conclusion that (αMe)Hph is as potent a β-turn and helix promoter as (αMe)Phe (Cα-methylphenylalanine) and (αEt)Phe (Cα-ethylphenylalanine)
对于空间要求的C的第一次若干衍生物和末端阻挡模型肽(以五肽水平)α -甲基-均-苯丙氨酸,(αMe)的Hph,残基已经被合成(通过溶液方法)和完全表征。的溶液构象分析的结果,通过使用FTIR和执行1 1 H NMR波谱,利于结论,即(αMe)的Hph是作为有效的β转角和螺旋启动子(αMe)苯丙氨酸(C α甲基苯丙氨酸)和(αEt )苯丙氨酸(C α -ethylphenylalanine),并且比的Phe母体氨基酸更有效。此外,对Nα对位的CD研究-bromobenzoylated肽表明(αMe)的Hphα碳的手性和转弯的普遍螺钉感和形成的螺旋结构之间的关系是相反的发现(αMe)Phe和(αEt)苯丙氨酸肽,即。L-氨基酸具有右旋性。这种关系与包括Phe在内的蛋白质氨基酸所表现出的关系相同。