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. 1988 Dec;170(12):5620–5624. doi: 10.1128/jb.170.12.5620-5624.1988

Mutations that affect production of branched RNA-linked msDNA in Myxococcus xanthus.

A Dhundale 1, T Furuichi 1, M Inouye 1, S Inouye 1
PMCID: PMC211660  PMID: 2461359

Abstract

A deletion mutation of the gene (msd-msr) for the branched RNA-linked msDNA of Myxococcus xanthus was constructed by replacing the chromosomal 0.7-kilobase (kb) SmaI-XhoI fragment encompassing msd-msr with a 1.4-kb fragment carrying a gene for kanamycin resistance. It was found that this deletion strain (delta msSX) could not produce msDNA, although it still contained another species of msDNA, mrDNA (msDNA, reduced size). No apparent differences between delta msSX and the wild-type strain were observed in terms of cell growth, morphogenesis, fruiting-body formation, or motility. Both a deletion mutation at the region 100 base pairs upstream of msd and an insertion mutation at a site 500 base pairs upstream of msd showed a significant reduction of msDNA production, indicating that there is a cis- or trans-acting positive element in this region. When the 3.5-kb BamHI fragment carrying msd-msr from Stigmatella aurantiaca was inserted into the M. xanthus chromosome, the S. aurantiaca msDNA was found to be produced in M. xanthus.

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Selected References

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