Insertion specificity and trans -activation of IS801 |
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| Authors: | G Y Richter K Bj?rkl?f M Romantschuk and D Mills |
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| Institution: | (1) Department of Biology, Southern Oregon University Ashland, Oregon, USA, US;(2) Finnish Environment Institute, Hakuninmaantie 4-6 FIN-00430, Helsinki, Finland, FI;(3) Department of Biosciences Division of General Microbiology, P.O.B. 56, FIN-00014 University of Helsinki, Helsinki, Finland, FI;(4) Department of Botany and Plant Pathology Cordley Hall Rm 2082, Oregon State University Corvallis, OR 97331-2902, USA e-mail: millsd@bcc.orst.edu Tel.: +1-541-737-5303, Fax: +1-541-737-3573, US |
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| Abstract: | The transposable element IS801, isolated from plasmid pMMC7105 of Pseudomonas syringae pv. phaseolicola, transposes in Escherichia coli to plasmid targets, expressing a relatively relaxed target specificity. The target sequences are tetramers with homology
with the left terminus (GAAC) of the transposing unit, the alternative targets being GAAC, GGAC, CAAG, and CGAC. In the areas
flanking IS801 in 13 different locations, no similarities other than the target tetramer were observed. The transposase is physically and
functionally separable from the transposing unit since transposition of constructs carrying marker genes occurs with the transposase
expressed in trans. The IS801 transposase shows amino acid sequence homology to the transposases of the E. coli elements IS91 and IS1294. These tranposases contain conserved amino acid motifs found in the replicases of certain plasmids that replicate as rolling
circles.
Received: 18 March 1998 / Accepted: 15 August 1998 |
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| Keywords: | Transposition Target sequence Pseudomonas syringae IS801 IS91 |
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