Yang Jingjie, Leen Eoin N, Maree Francois F, Curry Stephen
Departmet of Life Sciences, Imperial College , London , United Kingdom.
Transboundary Animal Disease Programme, Agricultural Research Council, Onderstepoort Veterinary Institute , Onderstepoort , South Africa.
PeerJ. 2016 Apr 26;4:e1964. doi: 10.7717/peerj.1964. eCollection 2016.
The replication of foot-and-mouth disease virus (FMDV) is dependent on the virus-encoded 3C protease (3C(pro)). As in other picornaviruses, 3C(pro) performs most of the proteolytic processing of the polyprotein expressed from the large open reading frame in the RNA genome of the virus. Previous work revealed that the 3C(pro) from serotype A-one of the seven serotypes of FMDV-adopts a trypsin-like fold. On the basis of capsid sequence comparisons the FMDV serotypes are grouped into two phylogenetic clusters, with O, A, C, and Asia 1 in one, and the three Southern African Territories serotypes, (SAT-1, SAT-2 and SAT-3) in another, a grouping pattern that is broadly, but not rigidly, reflected in 3C(pro) amino acid sequences. We report here the cloning, expression and purification of 3C proteases from four SAT serotype viruses (SAT2/GHA/8/91, SAT1/NIG/5/81, SAT1/UGA/1/97, and SAT2/ZIM/7/83) and the crystal structure at 3.2 Å resolution of 3C(pro) from SAT2/GHA/8/91.
口蹄疫病毒(FMDV)的复制依赖于病毒编码的3C蛋白酶(3C(pro))。与其他小RNA病毒一样,3C(pro)对病毒RNA基因组中大型开放阅读框所表达的多聚蛋白进行大部分的蛋白水解加工。先前的研究表明,FMDV七种血清型之一的A型3C(pro)具有胰蛋白酶样折叠结构。基于衣壳序列比较,FMDV血清型被分为两个系统发育簇,一个簇包含O、A、C和亚洲1型,另一个簇包含三个南非地区血清型(SAT-1、SAT-2和SAT-3),这种分组模式在3C(pro)氨基酸序列中大致但并非严格地有所体现。我们在此报告了四种SAT血清型病毒(SAT2/GHA/8/91、SAT1/NIG/5/81、SAT1/UGA/1/97和SAT2/ZIM/7/83)的3C蛋白酶的克隆、表达和纯化,以及SAT2/GHA/8/91的3C(pro)在3.2 Å分辨率下的晶体结构。