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Journal of Integrative Agriculture  2018, Vol. 17 Issue (09): 2031-2041    DOI: 10.1016/S2095-3119(18)61978-1
Special Issue: 植物病毒合辑Plant Virus
Plant Protection Advanced Online Publication | Current Issue | Archive | Adv Search |
Strawberry vein banding virus P6 protein intracellular transport and an important domain identification
PAN Yuan1*, ZHOU Xiu-hong2*, LI Shuai1, FENG Ming-feng1, SHI Man-ling3, ZUO Deng-pan1, JIANG Xi-zi1, CHEN Jing1, HU Ya-hui1, ZHANG Xiang-xiang1, JIANG Tong1
1 School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R.China
2 Biotechnology Center, Anhui Agricultural University, Hefei 230036, P.R.China
3 College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310000, P.R.China
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Abstract  
Strawberry vein banding virus (SVBV)-infected strawberry cells contain cytoplasmic inclusions with isometric particles.  To identify the components of the inclusions, green fluorescent protein (GFP) was fused to the carboxy-terminus (C-terminus) of SVBV open reading frames, these constructs were separately transformed into Agrobacterium tumefaciens and infiltrated into Nicotiana benthamiana leaves.  Results showed that the SVBV P6 protein assembled into prominent and amorphous inclusion bodies (IBs).  To investigate P6 subcellular localization, P6-GFP was ectopically expressed in N. benthamiana leaves by agroinfiltration and then stained with 4´,6-diamidino-2-phenylindole (DAPI).  We found the P6 protein accumulated in the nuclei and also formed cytoplasmic IBs with different sizes.  To further determine the location of P6 IBs in the cytoplasm, and explore whether the P6 IBs move freely or depend on cytoskeleton and endoplasmic reticulum (ER), the microfilament marker protein (GFP-ABD2-GFP), microtubules marker protein (mCherry-MAP65-1) and ER marker protein (mCherry-HDEL) were separately coexpressed with P6-GFP and into N. benthamiana leaves by agroinfiltration, exhibiting that P6 IBs aligned with cytoskeleton and endoplasmic reticulum.  Meanwhile, coinfiltration of P1 and P6 indicated the P6 colocalized with the P1 protein at periphery of cells.  The P6 protein contains one C-terminal nuclear localization signal (NLS) region, a P6 protein mutant with a deleted NLS did not localize in the nucleus, did not form IBs, and was unable to facilitate exogenous GFP expression.  These results demonstrate that the deleted NLS region is an important P6 domain required for biological functions.  In summary, the mobile P6 IBs are associated with ER, microfilaments and microtubules and move along microfilaments to the SVBV P1 protein in the PD. 
 
Keywords:  SVBV        IBs        intracellular transport        cytoskeleton        ER        P6 mutant   
Received: 29 November 2017   Accepted:
Fund: This work was supported by the Fund of State Key Laboratory for Biology of Plant Diseases and Insect Pests (SKLOF201710), the National Natural Science Foundation of China (31671999, 31371915) and the Zhejiang Natural Science Foundation of China (LY17C140001).
Corresponding Authors:  Correspondence JIANG Tong, Tel: +86-551-65786312, E-mail: jiangtong4650@sina.com    
About author:  PAN Yuan, E-mail: yuanpan1005@163.com; ZHOU Xiu-hong, E-mail: swjszx86@ahau.edu.cn; * These authors contributed equally to this study.

Cite this article: 

PAN Yuan, ZHOU Xiu-hong, LI Shuai, FENG Ming-feng, SHI Man-ling, ZUO Deng-pan, JIANG Xi-zi, CHEN Jing, HU Ya-hui, ZHANG Xiang-xiang, JIANG Tong. 2018. Strawberry vein banding virus P6 protein intracellular transport and an important domain identification. Journal of Integrative Agriculture, 17(09): 2031-2041.

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