Structure of the nucleocapsid protein of porcine reproductive and respiratory syndrome virus.

Structure of the nucleocapsid protein of porcine reproductive and respiratory syndrome virus.
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DOI:
10.1016/j.str.2003.09.018
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发表时间:
2003-11
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Dokland T
Dokland T
中科院分区:
其他
文献类型:
--
作者:
Doan DN;Dokland T

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猪繁殖与呼吸综合征病毒(PRRSV)是动脉病毒科的一种包膜RNA病毒,与冠状病毒基因组相关。PRRSV是世界范围内猪严重和持续性呼吸道疾病和繁殖衰竭的病原体。PRRSV病毒粒子包含一个由123个氨基酸的核衣壳蛋白(N)组成的核心,这是ORF7基因的产物。我们已经确定了n的衣壳形成域的晶体结构,并利用硫的异常信号通过SAD方法求解到2.6 Å分辨率。N蛋白以紧密二聚体的形式存在于晶体中,形成由两个长α螺旋叠加的四链β片底,两侧是两个N端和两个c端α螺旋。N的结构代表了一类新的病毒衣壳形成结构域,与其他已知的包膜病毒的结构域明显不同,但使人联想到噬菌体MS2的外壳蛋白。
Porcine reproductive and respiratory syndrome virus (PRRSV) is an enveloped RNA virus of the Arteriviridae family, genomically related to the coronaviruses. PRRSV is the causative agent of both severe and persistent respiratory disease and reproductive failure in pigs worldwide. The PRRSV virion contains a core made of the 123 amino acid nucleocapsid (N) protein, a product of the ORF7 gene. We have determined the crystal structure of the capsid-forming domain of N. The structure was solved to 2.6 Å resolution by SAD methods using the anomalous signal from sulfur. The N protein exists in the crystal as a tight dimer forming a four-stranded β sheet floor superposed by two long α helices and flanked by two N- and two C-terminal α helices. The structure of N represents a new class of viral capsid-forming domains, distinctly different from those of other known enveloped viruses, but reminiscent of the coat protein of bacteriophage MS2.
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