title: Bacterial origin of a chloroplast intron: conserved self-splicing group I introns in cyanobacteria.
abstract: A self-splicing group I intron has been found in the gene for a leucine transfer RNA in two species of Anabaena, a filamentous nitrogen-fixing cyanobacterium. The intron is similar to one that is found at the identical position in the same transfer RNA gene of chloroplasts of land plants. Because cyanobacteria were the progenitors of chloroplasts, it is likely that group I introns predated the endosymbiotic association of these eubacteria with eukaryotic cells.
authors: Department of Biological Sciences, State University of New York, Albany 12222.
authors: M Q
authors: MQ
authors: Xu
authors: S D
authors: SD
authors: Kathe
authors: H
authors: H
authors: Goodrich-Blair
authors: S A
authors: SA
authors: Nierzwicki-Bauer
authors: D A
authors: DA
authors: Shub
mesh_terms: D000818:Animals; D001419:Bacteria / Q000235:genetics*; D001483:Base Sequence; D005075:Biological Evolution; D002736:Chloroplasts / Q000378:metabolism*; D000458:Cyanobacteria / Q000235:genetics*; D004247:DNA / Q000235:genetics / Q000378:metabolism; D015246:Deoxyribonuclease EcoRI / Q000378:metabolism; D015247:Deoxyribonuclease HindIII / Q000378:metabolism; D007438:Introns / Q000235:genetics*; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012326:RNA Splicing; D012356:RNA, Transfer, Leu / Q000235:genetics*; D015183:Restriction Mapping; D013768:Tetrahymena / Q000235:genetics
chemical_list: D012356:RNA, Transfer, Leu; D004247:DNA; D015246:Deoxyribonuclease EcoRI; D015247:Deoxyribonuclease HindIII