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Journal of Bacteriology, February 1999, p. 1049-1053, Vol. 181, No. 3
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Sporadic Distribution of tRNACCUArg Introns among alpha -Purple Bacteria: Evidence for Horizontal Transmission and Transposition of a Group I Intron

Bruno Paquin,dagger Annette Heinfling,Dagger and David A. Shub*

Department of Biological Sciences and Center for Molecular Genetics, University at Albany---SUNY, Albany, New York 12222

Received 8 June 1998/Accepted 17 November 1998

A group I intron interrupts the tRNACCUArg gene of the alpha -purple bacterium Agrobacterium 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 alpha -purple bacteria. Of 10 newly identified tRNACCUArg genes, we found only two that contained an intron homologous to that of the Agrobacterium tRNACCUArg intron. This restricted and scattered distribution of the tRNACCUArg intron among alpha -purple bacteria is consistent with a recent origin and horizontal transmission. Primary and secondary structural similarities between tRNAUAALeu introns found in strains of the cyanobacterium Microcystis aeruginosa (K. Rudi and K. S. Jacobsen, FEMS Microbiol. Lett. 156:293-298, 1997) and alpha -purple tRNACCUArg introns suggest that these introns share a more recent common ancestor than either does with other known cyanobacterial tRNAUAALeu introns.

* Corresponding author. Mailing address: Department of Biological Sciences and Center for Molecular Genetics, University at Albany---SUNY, Albany, NY 12222. Phone: (518) 442-4324. Fax: (518) 442-4767. E-mail: shub{at}cnsunix.albany.edu.

dagger Present address: Département de Biochimie, Université de Montréal, Montréal, QC, H3C 3J7, Canada.

Dagger Present address: FG Microbial Ecology, Technical University Berlin, D-10587 Berlin, Germany.

Journal of Bacteriology, February 1999, p. 1049-1053, Vol. 181, No. 3
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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