Philippe Armand , Kent Kirshenbaum , Alexis Falicov , Roland L Dunbrack Jr , Ken A Dill , Ronald N Zuckermann , Fred E Cohen
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In this report, we explore the conformational properties of these N<em>α</em> chiral peptoids by molecular mechanics calculations and we propose a model for the solution conformation of an octamer of (<em>S)</em>-N-(1-phenylethyl)glycine.</p></div><div><h3>Results:</h3><p>Molecular mechanics calculations indicate that the presence of N-substituents in which the N<em>α</em> carbons are chiral centers has a dramatic impact on the available backbone conformations. These results are supported by semi-empirical quantum mechanical calculations and coincide qualitatively with simple steric considerations. They suggest that an octamer of (<em>S)</em>-N-(phenylethyl)glycine should form a right-handed helix with <em>cis</em> amide bonds, similar to the polyproline type I helix. This model is consistent with circular dichroism studies of these molecules.</p></div><div><h3>Conclusions:</h3><p>Peptoid oligomers containing chiral centers in their sidechains present a new structural paradigm that has promising implications for the design of stably folded molecules. We expect that their novel structure may provide a scaffold to create heteropolymers with useful functionality.</p></div>","PeriodicalId":79488,"journal":{"name":"Folding & design","volume":"2 6","pages":"Pages 369-375"},"PeriodicalIF":0.0000,"publicationDate":"1997-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1359-0278(97)00051-5","citationCount":"135","resultStr":"{\"title\":\"Chiral N-substituted glycines can form stable helical conformations\",\"authors\":\"Philippe Armand , Kent Kirshenbaum , Alexis Falicov , Roland L Dunbrack Jr , Ken A Dill , Ronald N Zuckermann , Fred E Cohen\",\"doi\":\"10.1016/S1359-0278(97)00051-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Background:</h3><p>Short sequence-specific heteropolymers of N-substituted glycines (peptoids) have emerged as promising tools for drug discovery. Recent work on medium-length peptoids containing chiral centers in their sidechains has demonstrated the existence of stable chiral conformations in solution. In this report, we explore the conformational properties of these N<em>α</em> chiral peptoids by molecular mechanics calculations and we propose a model for the solution conformation of an octamer of (<em>S)</em>-N-(1-phenylethyl)glycine.</p></div><div><h3>Results:</h3><p>Molecular mechanics calculations indicate that the presence of N-substituents in which the N<em>α</em> carbons are chiral centers has a dramatic impact on the available backbone conformations. These results are supported by semi-empirical quantum mechanical calculations and coincide qualitatively with simple steric considerations. They suggest that an octamer of (<em>S)</em>-N-(phenylethyl)glycine should form a right-handed helix with <em>cis</em> amide bonds, similar to the polyproline type I helix. This model is consistent with circular dichroism studies of these molecules.</p></div><div><h3>Conclusions:</h3><p>Peptoid oligomers containing chiral centers in their sidechains present a new structural paradigm that has promising implications for the design of stably folded molecules. 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引用次数: 135
摘要
背景:n -取代甘氨酸(类肽)的短序列特异性异聚物已成为药物发现的有前途的工具。最近对在其侧链中含有手性中心的中长度类肽的研究表明,溶液中存在稳定的手性构象。在本报告中,我们通过分子力学计算探讨了这些Nα手性肽的构象性质,并提出了(S)- n -(1-苯乙基)甘氨酸八聚体的溶液构象模型。结果:分子力学计算表明,以Nα碳为手性中心的n取代基的存在对骨架构象有显著影响。这些结果得到了半经验量子力学计算的支持,并在定性上与简单的空间考虑相一致。他们认为(S)- n -(苯乙基)甘氨酸的八聚体应该形成具有顺式酰胺键的右手螺旋,类似于聚脯氨酸I型螺旋。这个模型与这些分子的圆二色性研究是一致的。结论:侧链中含有手性中心的类肽低聚物提供了一种新的结构范式,对设计稳定折叠的分子具有重要意义。我们期望他们的新结构可以为制造具有有用功能的杂聚聚合物提供一个支架。
Chiral N-substituted glycines can form stable helical conformations
Background:
Short sequence-specific heteropolymers of N-substituted glycines (peptoids) have emerged as promising tools for drug discovery. Recent work on medium-length peptoids containing chiral centers in their sidechains has demonstrated the existence of stable chiral conformations in solution. In this report, we explore the conformational properties of these Nα chiral peptoids by molecular mechanics calculations and we propose a model for the solution conformation of an octamer of (S)-N-(1-phenylethyl)glycine.
Results:
Molecular mechanics calculations indicate that the presence of N-substituents in which the Nα carbons are chiral centers has a dramatic impact on the available backbone conformations. These results are supported by semi-empirical quantum mechanical calculations and coincide qualitatively with simple steric considerations. They suggest that an octamer of (S)-N-(phenylethyl)glycine should form a right-handed helix with cis amide bonds, similar to the polyproline type I helix. This model is consistent with circular dichroism studies of these molecules.
Conclusions:
Peptoid oligomers containing chiral centers in their sidechains present a new structural paradigm that has promising implications for the design of stably folded molecules. We expect that their novel structure may provide a scaffold to create heteropolymers with useful functionality.