title: Prediction of functional regions of the maize streak virus replication-associated proteins by protein-protein interaction analysis.
abstract: The replication of the geminiviruses depends on the viral encoded early (complementary-sense) proteins and on host genome encoded factors. Additionally, some of the early proteins (the AL2 protein of subgroup III, and the RepA (formerly known as C1) or Rep (C1:C2) proteins of subgroup I geminiviruses) can function as transcriptional activators of virion- (V-)sense gene expression. The yeast two-hybrid system has allowed us to predict some of the functionally important regions of the maize streak virus (MSV) early proteins RepA and Rep. Defined domains of these proteins were shown to act as transactivators in yeast cells. We detected the association of the RepA and Rep proteins, and their subfragments, with the maize retinoblastoma protein (ZmRb1) which is likely to be one of the interacting host proteins. We showed the self-association capability of the MSV proteins and suggest that homo- or hetero-oligomerization may play an important role in virus replication. These results provide new insights into the role of different regions of the MSV proteins in relation to transcriptional activation and regulation of viral DNA replication.
authors.affiliation: Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, Szeged.
authors.forename: G V
authors.initials: GV
authors.lastname: Horváth
authors.forename: A
authors.initials: A
authors.lastname: Pettkó-Szandtner
authors.forename: K
authors.initials: K
authors.lastname: Nikovics
authors.forename: M
authors.initials: M
authors.lastname: Bilgin
authors.forename: M
authors.initials: M
authors.lastname: Boulton
authors.forename: J W
authors.initials: JW
authors.lastname: Davies
authors.forename: C
authors.initials: C
authors.lastname: Gutiérrez
authors.forename: D
authors.initials: D
authors.lastname: Dudits
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D018797:Cell Cycle Proteins; D016384:Consensus Sequence; D004265:DNA Helicases / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins; D019281:Dimerization; D017791:Geminiviridae / Q000235:genetics / Q000502:physiology*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D016160:Retinoblastoma Protein / Q000235:genetics; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014779:Virus Replication; D003313:Zea mays / Q000235:genetics / Q000378:metabolism
chemical_list: D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D010940:Plant Proteins; D011506:Proteins; C107938:RRB1 protein, Zea mays; D016160:Retinoblastoma Protein; D015534:Trans-Activators; D014764:Viral Proteins; C045264:replication initiator protein; D004265:DNA Helicases