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Journal of Bacteriology, March 2002, p. 1481-1487, Vol. 184, No. 5
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.5.1481-1487.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Novel Group I Intron in the tRNA^Leu(UAA) Gene of a -Proteobacterium Isolated from a Deep Subsurface Environment

Department of Biology and New York Center for Studies on the Origins of Life (NSCORT), Rensselaer Polytechnic Institute, Troy, New York 12180

Received 3 July 2001/ Accepted 2 November 2001

A group I intron has been found to interrupt the anticodon loop of the tRNA^Leu(UAA) gene in a bacterium belonging to the -subdivision of Proteobacteria and isolated from a deep subsurface environment. The subsurface isolate SMCC D0715 was identified as belonging to the genus Pseudomonas. The group I intron from this isolate is the first to be reported for -proteobacteria, and the first instance of a tRNA^Leu(UAA) group I intron to be found in a group of bacteria other than cyanobacteria. The 231-nucleotide (nt) intron's sequence has group I conserved elements and folds into a bona fide group I secondary structure with canonical base-paired segments P1 to P9 and a paired region, P10. The D0715 intron possesses the 11-nt motif CCUACG ... UAUGG in its P8 region, a feature not common in bacterial introns. To date, phylogenetic analysis has shown that bacterial introns form two distinct families, and their complex distribution suggests that both lateral transfer and common ancestry have taken part in the evolutionary history of these elements.

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