title: Complementation of and interference with Sindbis virus replication by full-length and deleted forms of the nonstructural protein, nsP1, expressed in stable transfectants of Hela cells.
abstract: Stable transfectants of Hela cells were isolated which expressed either the full-length 540-amino-acid Sindbis virus (SV) nonstructural protein, nsP1 (the form encoded by the mutant, SV(LM21)), or one of four forms with a carboxyl-terminal deletion. SV(LM21), in contrast to standard SV (SV(STD)), can replicate in Hela cells maintained in low-methionine (LM) medium. Expression of full-length nsP1(1-540), nsP1(1-492), or nsP1(1-448) resulted in complementation of SV(STD) when infected Hela cells were kept in LM medium after infection. In contrast, when cells were infected with SV(LM21) and maintained in LM medium, stable expression of any of the deleted forms of nsP1 interfered with the replication of virus. The ability of "cellular" nsP1 to complement SV(STD) in LM medium correlated with its methyltransferase activity.
authors.affiliation: Department of Molecular Genetics and Microbiology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway 08854-5635, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Li
authors.forename: H L
authors.initials: HL
authors.lastname: Wang
authors.forename: V
authors.initials: V
authors.lastname: Stollar
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D002642:Chick Embryo; D006224:Cricetinae; D005816:Genetic Complementation Test; D006367:HeLa Cells; D006801:Humans; D008715:Methionine / Q000378:metabolism; D012367:RNA, Viral / Q000096:biosynthesis; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000378:metabolism; D017384:Sequence Deletion; D012845:Sindbis Virus / Q000235:genetics / Q000502:physiology*; D014162:Transfection; D017361:Viral Nonstructural Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D014779:Virus Replication
chemical_list: D012367:RNA, Viral; D011994:Recombinant Proteins; D017361:Viral Nonstructural Proteins; C104211:nsP1 protein, Sindbis virus; D008715:Methionine