期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 131, 期 23, 页码 8066-8076出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja900063s
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资金
- NIAID NIH HHS [AI74517, U01 AI074571] Funding Source: Medline
- NIGMS NIH HHS [R01 GM088204, R37 GM054616, R01 GM056416, GM56416] Funding Source: Medline
Amantadine has been used for decades as an inhibitor of the influenza A virus M2 protein (AM2) in the prophylaxis and treatment of influenza A infections, but its clinical use has been limited by its central nervous system (CNS) side effects as well as emerging drug-resistant strains of the virus. With the goal of searching for new classes of M2 inhibitors, a structure-activity relation study based on 2-[3-azaspiro(5,5)undecanol]-2-imidazoline (BL-1743) was initiated. The first generation BL-1743 series of compounds has been synthesized and tested by two-electrode voltage-clamp (TEV) assays. The most active compound from this library, 3-azaspiro[5,5]undecane hydrochloride (9), showed an IC50 as low as 0.92 +/- 0.11 mu M against AM2, more than an order of magnitude more potent than amantadine (IC50 = 16 mu M). N-15 and C-13 solid-state NMR was employed to determine the effect of compound 9 on the structure and dynamics of the transmembrane domain of AM2 (AM2-TM) in phospholipid bilayers. Compared to amantadine, spiro-piperidine 9 (1) induces a more homogeneous conformation of the peptide, (2) reduces the dynamic disorder of the G34-135 backbone near the water-filled central cavity of the helical bundle, and (3) influences the dynamics and magnetic environment of more residues within the transmembrane helices. These data suggest that spiro-piperidine 9 binds more extensively with the AM2 channel, thus leading to stronger inhibitory potency.
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