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A group I intron interrupts the tRNACCU Arg gene of the α-purple bacteriumAgrobacterium tumefaciens (B. Reinhold-Hurek and D. A. Shub, Nature [London] 357:173–176, 1992). In this study, we assess the distribution of the corresponding intron among 12 additional species of α-purple bacteria. Of 10 newly identified tRNACCU Arg genes, we found only two that contained an intron homologous to that of theAgrobacterium tRNACCU Arg intron. This restricted and scattered distribution of the tRNACCU Arg intron among α-purple bacteria is consistent with a recent origin and horizontal transmission. Primary and secondary structural similarities between tRNAUAA Leu introns found in strains of the cyanobacteriumMicrocystis aeruginosa (K. Rudi and K. S. Jacobsen, FEMS Microbiol. Lett. 156:293–298, 1997) and α-purple tRNACCU Arg introns suggest that these introns share a more recent common ancestor than either does with other known cyanobacterial tRNAUAA Leu introns.

journal of bacteriology

Sporadic Distribution of tRNA <sub>CCU</sub> <sup>Arg</sup> Introns among α-Purple Bacteria: Evidence for Horizontal Transmission and Transposition of a Group I Intron

Sporadic Distribution of tRNA CCU Arg Introns among α-Purple Bacteria: Evidence for Horizontal Transmission and Transposition of a Group I Intron

Sporadic Distribution of tRNA _CCU ^Arg Introns among α-Purple Bacteria: Evidence for Horizontal Transmission and Transposition of a Group I Intron