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An Integrated Imaging Probe Design: The Synthesis of Tc-99m/Re-Containing Macrocyclic Peptide Scaffolds

机译:集成成像探针设计:Tc-99m /含Re大环肽支架的合成

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摘要

beta-Sheets account for over 30% of all secondary structural conformations found in proteins. The intramolecular hydrogen bonding that exists between the two peptide strands is imperative in maintaining this secondary structure. With the proper design, cyclic peptides may act as scaffolds emulating active beta-sheet regions, enabling investigation of their importance in molecular recognition and protein aggregation. Starting from Fmoc-Lys(Fmoc)-OH, macrocyclic peptides were synthesized on a solid support, with peptidechain elongation extending from both the alpha and epsilon amines of the lysine. The branching peptides were cyclized with a pyridyl tridentate chelation core followed by coordination using [Tc-99m/Re(CO)(3)(H2O)(3)](+). Variable temperature H-1 NMR spectroscopy studies were performed, demonstrating that intramolecular hydrogen bonding exists between the two sides of the uncoordinated macrocyclic peptide scaffolds. Additionally, computational modelling and circular dichroism spectroscopic analysis revealed that the peptide backbone exists in a similar conformation both before and after metal coordination. The ability to seamlessly incorporate a tridentate chelation core into the backbone of a macrocyclic peptide, without disrupting the secondary structure, can greatly assist in the design of metal-centric peptidomimetic imaging agents. This novel integrated imaging probe approach may facilitate the investigation into protein- protein interactions using macrocyclic beta-sheet scaffolds.
机译:β-Sheets占蛋白质中所有二级结构构象的30%以上。存在于两个肽链之间的分子内氢键对于维持该二级结构是必不可少的。通过适当的设计,环肽可以充当模拟活性β-折叠区域的支架,从而能够研究其在分子识别和蛋白质聚集中的重要性。从Fmoc-Lys(Fmoc)-OH开始,大环肽在固相支持物上合成,肽链的延伸从赖氨酸的α和ε胺开始。用吡啶基三齿吡啶螯合核心环化分支肽,然后使用[Tc-99m / Re(CO)(3)(H2O)(3)](+)进行配位。进行了可变温度H-1 NMR光谱研究,表明未配位的大环肽支架的两侧之间存在分子内氢键。另外,计算模型和圆二色性光谱分析表明,肽骨架在金属配位之前和之后都以相似的构象存在。在不破坏二级结构的情况下,将三齿螯合核无缝结合到大环肽的骨架中的能力可以极大地帮助设计以金属为中心的拟肽成像剂。这种新颖的集成成像探针方法可能有助于使用大环β-折叠支架研究蛋白质-蛋白质相互作用。

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