Respiratory Virus Ion Channels

呼吸道病毒离子通道

• 批准号: 6878100
• 负责人: LAWRENCE H PINTO
• 金额: $ 22.2万
• 依托单位: NORTHWESTERN UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-01 至 2008-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6878100
• 关键词: Orthomyxoviridae; Xenopus; Xenopus oocyte; acidity /alkalinity; amantadine; drug resistance; electron spin resonance spectroscopy; gene mutation; influenzavirus A; membrane channels; protein structure function; tissue /cell culture; tryptophan; virus infection mechanism; virus protein

DESCRIPTION (provided by applicant): Influenza contributes substantially to worldwide morbidity and mortality, and it has been estimated that the next influenza pandemic will result in over 80,000 deaths, 300,000 hospitalizations and 18 million outpatient visits in the United States. The M2 ion channel protein of influenza A virus is the target of the antiviral drug rimantadine, but its usefulness is limited by the formation of rimantadine-resistant escape mutations within a few days of treatment. In order to develop more effective antiviral drugs, more information is needed about the M2 protein, especially the structure of its transmembrane pore and cytoplasmic domains and the mechanism by which it is activated. The following individual aims are designed to elucidate important features of the structure and function of the M2 protein. 1. Tryptophan 41 in the transmembrane pore is essential for activation of the M2 ion channel protein; we will perform functional and structural experiments to ascertain the role of tryptophan 41 in activation of the M2 protein. 2. The function of the M2 protein depends on the integrity of its cytoplasmic tail. Fluorescence and electroparamagnetic resonance (EPR) spectroscopy experiments will be performed to determine whether the cytoplasmic tail of the M2 protein forms a rosette lying on the membrane surface or forms a helix extending into the cytoplasm. 3. Key features of the structure of the pore and the cytoplasmic tail of the M2 ion channel will be determined using (EPR) spectroscopy. 4. In order to understand better the mechanism for resistance and to identify which functional properties of the channel are essential for its role in the virus life cycle, the functional properties of amantadine-resistant mutant M2 proteins will be characterized. 5. In a separate set of experiments we will use a sensitive method to test the NB protein of influenza B virus for ion channel activity.

描述（由申请人提供）：流感是全球发病率和死亡率的主要原因，据估计，下一次流感大流行将导致美国超过80，000人死亡，300，000人住院，1800万人门诊就诊。甲型流感病毒的M2离子通道蛋白是抗病毒药物金刚乙胺的靶点，但由于在治疗的几天内形成了金刚乙胺耐药的逃逸突变，其有效性受到限制。为了开发更有效的抗病毒药物，需要更多关于M2蛋白的信息，特别是其跨膜孔和胞质结构域的结构及其激活机制。以下的个别目标旨在阐明M2蛋白的结构和功能的重要特征。1.跨膜孔中的色氨酸41对于M2离子通道蛋白的活化是必不可少的;我们将进行功能和结构实验以确定色氨酸41在M2蛋白活化中的作用。2. M2蛋白的功能取决于其胞质尾区的完整性。将进行荧光和电顺磁共振（EPR）光谱实验，以确定M2蛋白质的胞质尾区是否形成位于膜表面的玫瑰花结或形成延伸到胞质中的螺旋。3.将使用（EPR）光谱法确定M2离子通道的孔和胞质尾结构的关键特征。4.为了更好地了解耐药机制并确定通道的哪些功能特性对其在病毒生命周期中的作用至关重要，将表征金刚烷胺耐药突变M2蛋白的功能特性。5.在一组单独的实验中，我们将使用灵敏的方法来测试B型流感病毒的NB蛋白的离子通道活性。