title: Expression and biochemical analyses of the recombinant potato virus X 25K movement protein.
abstract: The 25K movement protein (MP) of potato virus X (PVX) is encoded by the 5'-proximal gene of three overlapping MP genes forming a 'triple gene block'. The PVX 25K MP (putative NTPase-helicase) has been synthesized in Escherichia coli as a recombinant containing a six-histidine tag at the amino terminus. The His-tagged 25K protein was purified in a one-column Ni-chelate affinity chromatography procedure. In the absence of any other viral factors, this protein had obvious Mg2+-dependent ATPase activity, which was stimulated slightly (1.7-1.9-fold) by various polynucleotides. Like other viral proteins possessing ATPase-helicase motifs and many plant viral movement proteins, the PVX 25K MP was able to bind nucleic acids in vitro. The RNA binding activity of the 25K MP was pronounced only at very low salt concentrations and was independent of its ATPase activity.
authors.affiliation: Department of Virology of Moscow State University, Russian Federation.
authors.forename: N O
authors.initials: NO
authors.lastname: Kalinina
authors.forename: O N
authors.initials: ON
authors.lastname: Fedorkin
authors.forename: O V
authors.initials: OV
authors.lastname: Samuilova
authors.forename: E
authors.initials: E
authors.lastname: Maiss
authors.forename: T
authors.initials: T
authors.lastname: Korpela
authors.lastname: Morozov SYu
authors.forename: J G
authors.initials: JG
authors.lastname: Atabekov
mesh_terms: D017766:Acid Anhydride Hydrolases / Q000378:metabolism; D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000595:Amino Acid Sequence; D004926:Escherichia coli / Q000235:genetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D043583:Nucleoside-Triphosphatase; D053830:Plant Viral Movement Proteins; D017863:Potexvirus; D012313:RNA / Q000378:metabolism*; D020365:RNA Helicases; D012316:RNA Nucleotidyltransferases / Q000378:metabolism; D012367:RNA, Viral / Q000494:pharmacology; D016601:RNA-Binding Proteins / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D053830:Plant Viral Movement Proteins; D012367:RNA, Viral; D016601:RNA-Binding Proteins; D011994:Recombinant Proteins; D014764:Viral Proteins; D012313:RNA; D012316:RNA Nucleotidyltransferases; D017766:Acid Anhydride Hydrolases; D000251:Adenosine Triphosphatases; D043583:Nucleoside-Triphosphatase; D020365:RNA Helicases