Understanding the anomaly of cis–trans isomerism in Pro-His sequence

Sunil K Gupta,Shreya Banerjee,Erode N Prabhakaran

Bioorganic & Medicinal Chemistry Letters（2022）

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摘要

The anomalous absence of cisPro stabilizing CαHαXaa···πAro interactions at Xaa-Pro-Aro exclusively when Aro is His, is understood by NMR structural analyses of model peptides, as due to i → i backbone-side chain C6 H-bond that forms uniquely when Aro is His, which significantly decreases its χ1-g- population essential for CαHαXaa···πAro formation.

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关键词

Cis–trans isomerism,CH···π,γ-turn,C6 H-bond,Histidine

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