Subcellular localization of V2 protein of Tomato leaf curl Java virus by using green fluorescent protein and yeast hybrid system

Protoplasma. 2011 Apr;248(2):281-8. doi: 10.1007/s00709-010-0166-0. Epub 2010 Jun 13.

Abstract

Tomato leaf curl Java virus-A (ToLCJV-A[ID]) from Southeast Asia is a new member of the emerging group of monopartite begomoviruses that require a betasatellite component for symptom induction. Previously, we have elucidated the role of V1 ORF encoded by ToLCJV-A[ID] in cell-to-cell movement. In this study, the role of V2 (PreCP) in localization was determined. Subcellular localization of ToLCJV-A[ID] V2 in plant tissues showed that this protein is co-localized to the cell cytoplasm, perinuclear and associated with the endoplasmic reticulum network. The results obtained from deletion analysis indicate that fusion of N-terminal part of the V2, containing the nuclear export signals (NES), directed the accumulation of fluorescence towards the cell cytoplasm. Furthermore, functionality of the NES ((20)LAVKYLQLV(29)) in the N-terminal part of the V2 protein was confirmed by one-hybrid yeast system. Taken together, these results suggest that V2 enhances the coat protein-mediated nuclear export of ToLCJV-A[ID] and is consistent with the model in which V2 mediates viral DNA export from the nucleus to the plasmodesmata.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Begomovirus / metabolism*
  • Chimera / metabolism
  • Cytoplasmic Structures / virology
  • DNA, Viral / metabolism
  • Endoplasmic Reticulum / virology
  • Green Fluorescent Proteins / metabolism
  • Nicotiana / cytology
  • Nicotiana / virology
  • Plant Diseases / virology
  • Plant Leaves / cytology
  • Plant Leaves / virology
  • Polymerase Chain Reaction
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / metabolism
  • Sequence Analysis, DNA
  • Two-Hybrid System Techniques
  • Viral Proteins / metabolism*

Substances

  • DNA, Viral
  • Viral Proteins
  • Green Fluorescent Proteins