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Related Experiment Video

Updated: May 5, 2026

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Multicopy single-stranded DNA isolated from a gram-negative bacterium, Myxococcus xanthus.

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    Myxococcus xanthus bacteria contain numerous copies of a unique single-stranded DNA fragment, termed multicopy single-stranded DNA (msDNA). This msDNA, primed by RNA, exhibits an elaborate secondary structure and precisely matches a chromosomal sequence.

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    Area of Science:

    • Molecular Biology
    • Microbiology
    • Genetics

    Background:

    • Myxococcus xanthus is a gram-negative bacterium.
    • The bacterium contains 500-700 copies per chromosome of a short, single-stranded linear DNA fragment.

    Purpose of the Study:

    • To characterize the novel DNA fragment found in Myxococcus xanthus.
    • To determine the sequence and structure of this unique DNA element.

    Main Methods:

    • Labeling of the DNA fragment (multicopy single-stranded DNA; msDNA) at the 5' end.
    • Hybridization of labeled msDNA to total chromosomal DNA blots.
    • Cloning and sequencing of hybridized chromosomal DNA.
    • Direct sequencing of msDNA using DNA polymerase I Klenow fragment and terminal deoxynucleotidyl transferase.

    Main Results:

    • msDNA hybridized to unique high molecular weight bands on chromosomal blots.
    • The DNA portion of msDNA consists of 163 bases.
    • The msDNA sequence showed exact correspondence with a cloned chromosomal sequence.
    • The 5' end of msDNA was found to be primed by a short RNA segment.
    • An elaborate secondary structure is postulated for the msDNA sequence.
    • A similar satellite DNA was identified in Stigmatella aurantiaca.

    Conclusions:

    • Myxococcus xanthus possesses a unique multicopy single-stranded DNA (msDNA) element.
    • msDNA is derived from chromosomal DNA and exhibits a complex secondary structure.
    • The presence of similar DNA in Stigmatella aurantiaca suggests this may be a conserved feature in myxobacteria.