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Interaction Study of Soybean mosaic virus Proteins with Soybean Proteins using the Yeast-Two Hybrid System

  • Seo, Jang-Kyun (Department of Agricultural Biotechnology, Seoul National University) ;
  • Hwang, Sung-Hyun (Department of Agricultural Biotechnology, Seoul National University) ;
  • Kang, Sung-Hwan (Department of Agricultural Biotechnology, Seoul National University) ;
  • Choi, Hong-Soo (Department of Plant Pathology, National Institute of Agricultural Science and Technology, RDA) ;
  • Lee, Su-Heon (Department of Plant Pathology, National Institute of Agricultural Science and Technology, RDA) ;
  • Sohn, Seong-Han (Cell and Genetics Division, National Institute of Agricultural Biotechnology, RDA) ;
  • Kim, Kook-Hyung (Department of Agricultural Biotechnology, Seoul National University)
  • Published : 2007.12.31

Abstract

Interactions between viral proteins and host proteins are essential for virus replication. Especially, translation of viral genes completely depends on the host machinery. In potyviruses, interactions of genome-linked viral protein (VPg) with host translation factors including eIF4E, eIF(iso)4E, and poly(A)-binding protein (PABP) has previously been characterized. In this study, we investigated interactions between Soybean mosaic virus (SMV) viral proteins and host translation factors by yeast two-hybrid system. SMV VPg interacted with eIF4E, eIF(iso)4E, and PABP in yeast two-hybrid system, while SMV helper component proteinase (HC-pro) interacted with neither of those proteins. The interaction between SMV NIb and PABP was also detected. These results are consistent with those reported previously in other potyviruses. Interestingly, we found reproducible and specific interactions between SMV coat protein (CP) and PABP. Deletion analysis showed that the region of CP comprising amino acids 116 to 206 and the region of PABP comprising amino acids 520 to 580 are involved in CP/PABP interactions. Soybean library screening with SMV NIb by yeast two-hybrid assay also identified several soybean proteins including chlorophyll a/b binding preprotein, photo-system I-N subunit, ribulose 1,5-biphosphate carboxylase, ST-LSI protein, translation initiation factor 1, TIR-NBS type R protein, RNA binding protein, ubiquitin, and LRR protein kinase. Altogether, these results suggest that potyviral replicase may comprise a multi-protein complex with PABP, CP, and other host factors.

Keywords

References

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