title: Phosphorylation of coat protein by protein kinase CK2 regulates cell-to-cell movement of Bamboo mosaic virus through modulating RNA binding.
abstract: In this study, we investigated the fine regulation of cell-to-cell movement of Bamboo mosaic virus (BaMV). We report that the coat protein (CP) of BaMV is phosphorylated in planta at position serine 241 (S241), in a process involving Nicotiana benthamiana casein kinase 2α (NbCK2α). BaMV CP and NbCK2α colocalize at the plasmodesmata, suggesting that phosphorylation of BaMV may be involved in its movement. S241 was mutated to examine the effects of temporal and spatial dysregulation of phosphorylation on i) the interactions between CP and viral RNA and ii) the regulation of cell-to-cell movement. Replacement of S241 with alanine did not affect RNA binding affinity but moderately impaired cell-to-cell movement. A negative charge at position 241 reduced the ability of CP to bind RNA and severely interfered with cell-to-cell movement. Deletion of residues 240 to 242 increased the affinity of CP to viral RNA and dramatically impaired cell-to-cell movement. A threonine at position 241 changed the binding preference of CP toward genomic RNA and inhibited cell-to-cell movement. Together, these results reveal a fine regulatory mechanism for the cell-to-cell movement of BaMV, which involves the modulation of RNA binding affinity through appropriate phosphorylation of CP by NbCK2α.
authors.forename: Chien-Jen
authors.initials: CJ
authors.lastname: Hung
authors.forename: Ying-Wen
authors.initials: YW
authors.lastname: Huang
authors.forename: Ming-Ru
authors.initials: MR
authors.lastname: Liou
authors.forename: Ya-Chien
authors.initials: YC
authors.lastname: Lee
authors.forename: Na-Sheng
authors.initials: NS
authors.lastname: Lin
authors.forename: Menghsiao
authors.initials: M
authors.lastname: Meng
authors.forename: Ching-Hsiu
authors.initials: CH
authors.lastname: Tsai
authors.forename: Chung-Chi
authors.initials: CC
authors.lastname: Hu
authors.forename: Yau-Heiu
authors.initials: YH
authors.lastname: Hsu
mesh_terms: D000595:Amino Acid Sequence; D036022:Capsid Proteins / Q000235:genetics / Q000378:metabolism*; D047390:Casein Kinase II / Q000235:genetics / Q000378:metabolism*; D017930:Genes, Reporter; D008954:Models, Biological; D008969:Molecular Sequence Data; D009154:Mutation; D010766:Phosphorylation; D010935:Plant Diseases / Q000821:virology*; D018515:Plant Leaves / Q000166:cytology / Q000201:enzymology / Q000235:genetics / Q000821:virology; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D031425:Plasmodesmata / Q000821:virology; D017863:Potexvirus / Q000235:genetics / Q000502:physiology* / Q000648:ultrastructure; D011485:Protein Binding; D012367:RNA, Viral / Q000235:genetics; D011993:Recombinant Fusion Proteins; D014026:Nicotiana / Q000166:cytology / Q000201:enzymology* / Q000235:genetics / Q000821:virology
chemical_list: D036022:Capsid Proteins; D010940:Plant Proteins; D012367:RNA, Viral; D011993:Recombinant Fusion Proteins; D047390:Casein Kinase II