title: Examination of a virulence mutant uncovers the ribosome biogenesis regulatory protein of Toxoplasma gondii.
abstract: Several insertional mutants identified in a screen for Toxoplasma gondii that were defective in establishing a chronic infection had a common site of plasmid insertion. This insertion site was determined to be 43 bp upstream of the transcription initiation site of a gene whose predicted product has homology to ribosome biogenesis regulatory protein Rrs1p, an essential protein required for ribosome biogenesis in Saccharomyces cerevisiae. Northern blot analysis of this locus, termed TgRRS1 , showed that in the C3 mutant, the full-length transcript is down-regulated and at least 1 new smaller transcript is present. Restoration of the intact predicted promoter and locus to TgRRS1 insertional mutant strain C3 did not restore brain cyst formation to the levels of the parent strain. Epitope-tagged TgRRS1 was found to localize to the parasite nucleolus, in an area corresponding to the granular component region. TgRRS1 can serve as a marker for the sub-nucleolar granular component region of T. gondii.
authors: Department of Molecular Biology, University of Oregon, Eugene, Oregon 97403, USA.
authors: Kathy C
authors: KC
authors: Milligan-Myhre
authors: Peggy J
authors: PJ
authors: Rooney
authors: Laura J
authors: LJ
authors: Knoll
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000469:parasitology; D002466:Cell Nucleolus / Q000737:chemistry; D016054:DNA, Protozoan / Q000737:chemistry; D051379:Mice; D008808:Mice, Inbred CBA; D016254:Mutagenesis, Insertional; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics*; D015800:Protozoan Proteins / Q000737:chemistry / Q000235:genetics*; D012269:Ribosomal Proteins / Q000737:chemistry / Q000235:genetics*; D016415:Sequence Alignment; D014122:Toxoplasma / Q000235:genetics / Q000472:pathogenicity*; D014124:Toxoplasmosis, Animal / Q000469:parasitology*; D014774:Virulence / Q000235:genetics
chemical_list: D016054:DNA, Protozoan; D009687:Nuclear Proteins; D015800:Protozoan Proteins; D012269:Ribosomal Proteins; C569914:ribosome biogenesis regulatory protein, Toxoplasma gondii