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Rare Group I Intron with Insertion Sequence Element in a Bacterial Ribonucleotide Reductase Gene

Institute of Biological Sciences and Biotechnology, Donghua University, Shanghai 201620, China,¹ Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia, B3H 1X5, Canada,² State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, Hubei 430072, China³

Received 7 September 2006/ Accepted 5 December 2006

A rare group I intron in a cyanobacterial ribonucleotide reductase gene has been characterized. It contains a mobile insertion sequence element not required for RNA splicing. Ribonucleotide reductase genes were found to be hot spots for all three types of self-splicing intervening sequences, including group I and II introns and inteins.

Published ahead of print on 18 December 2006.