Construction and characterization of 3A-epitope-tagged foot-and-mouth disease virus

文献类型: 外文期刊

第一作者: Ma, Xueqing

作者: Ma, Xueqing;Li, Pinghua;Sun, Pu;Bai, Xingwen;Bao, Huifang;Lu, Zengjun;Fu, Yuanfang;Cao, Yimei;Li, Dong;Chen, Yingli;Liu, Zaixin;Qiao, Zilin

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关键词: Foot-and-mouth disease virus;3A;Foreign epitope

期刊名称:INFECTION GENETICS AND EVOLUTION ( 影响因子:3.342; 五年影响因子:3.188 )

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收录情况: SCI

摘要: Nonstructural protein 3A of foot-and-mouth disease virus (FMDV) is a partially conserved protein of 153 amino acids (aa) in most FMDVs examined to date. Specific deletion in the FMDV 3A protein has been associated with the inability of FMDV to grow in primary bovine cells and cause disease in cattle. However, the aa residues playing key roles in these processes are poorly understood. In this study, we constructed epitope-tagged FMDVs containing an 8 aa FLAG epitope, a 9 aa haemagglutinin (HA) epitope, and a 10 aa c-Myc epitope to substitute residues 94-101,93-101, and 93-102 of 3A protein, respectively, using a recently developed O/SEA/Mya-98 FMDV infectious cDNA clone. lmmunofluorescence assay (IFA), Western blot and sequence analysis showed that the epitope-tagged viruses stably maintained and expressed the foreign epitopes even after 10 serial passages in BHK-21 cells. The epitope-tagged viruses displayed growth properties and plaque phenotypes similar to those of the parental virus in BHK-21 cells. However, the epitope-tagged viruses exhibited lower growth rates and smaller plaque size phenotypes than those of the parental virus in primary fetal bovine kidney (FBK) cells, but similar growth properties and plaque phenotypes to those of the recombinant viruses harboring 93-102 deletion in 3A. These results demonstrate that the decreased ability of FMDV to replicate in primary bovine cells was not associated with the length of 3A, and the genetic determinant thought to play key role in decreased ability to replicate in primary bovine cells could be reduced from 93-102 residues to 8 aa residues at positions 94-101 in 3A protein. (C) 2015 Elsevier B.V. All rights reserved.

分类号: R1

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