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Novel one-step cloning vector with a transposable element: application to the Myxococcus xanthus genome.

ABSTRACT

A new strategy was developed for rapid cloning of genes with a transposon mutation library. We constructed a transposon designated TnV that was derived from Tn5 and consists of the gene coding for neomycin phosphotransferase II as well as the replication origin of an Escherichia coli plasmid, pSC101, flanked by Tn5 inverted repeats (IS50L and IS50R). TnV can transpose to many different sites of DNA in E. coli and Myxococcus xanthus and confers kanamycin resistance (Kmr) to the cells. From the Kmr cells, one-step cloning of a gene which is mutated as a result of TnV insertion can be achieved as follows. Chromosomal DNA isolated from TnV-mutagenized cells is digested with an appropriate restriction enzyme, ligated, and transformed into E. coli cells with selection for Kmr. The plasmids isolated contain TnV in the target gene. The plasmid DNA can then be used as a probe for characterization of the gene and screening of clones from a genomic library. We used this vector to clone DNA fragments containing genes involved in the development of M. xanthus.

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