title: A mutation in the R body-coding sequence destroys expression of the killer trait in P. tetraurelia.
abstract: This report describes a mutant strain of Caedibacter taeniospiralis 169 that does not produce refractile (R) bodies or kill sensitive paramecia, but still renders its host resistant to killing by wild-type strains of Caedibacter taeniospiralis. The mutation is due to insertion of a 7.5-kilobase, transposon-like element into the R body-coding region of the plasmid pKAP169. The results provide strong evidence that R body synthesis is required for expression of the killer trait.
mesh_terms: D001419:Bacteria / Q000235:genetics; D018407:Bacterial Physiological Phenomena; D004251:DNA Transposable Elements; D010247:Paramecium / Q000235:genetics / Q000382:microbiology* / Q000502:physiology; D010957:Plasmids; D013559:Symbiosis
chemical_list: D004251:DNA Transposable Elements