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Reference: Luetke KH and Sadowski PD (1998) Determinants of the position of a Flp-induced DNA bend. Nucleic Acids Res 26(6):1401-7

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Abstract


The Flp site-specific recombinase from Saccharomyces cerevisiae induces DNA bending upon interaction with the Flp recognition target (FRT) site. The minimal FRT site is comprised of two inverted binding elements which flank a central core region. Binding of a single monomer of Flp to DNA induces a DNA bend of 60 degrees. The position of this bend differed depending on whether the substrate contained a single binding element or a two-element FRT site. In the present work we tested and disproved a model in which a single Flp monomer interacts with both symmetry elements of a single FRT site. Likewise, we showed that a model in which a Flp monomer dissociates from a singly occupied FRT site and reassociates with the unbound element of another singly occupied FRT site during electrophoresis, does not account for the apparent shift in the position of the bend centre. It seems that the movement of a Flp monomer between the a and b elements of one FRT site during electrophoresis accounts for this anomaly. The position of the DNA bend resulting from the association of a Flp monomer with the FRT site is also influenced by the DNA sequences flanking the site. We conclude that attempts to measure the bend centre of a complex of one Flp molecule bound to a DNA containing two binding elements give misleading results. The position of the bend is more accurately measured in the presence of a single binding element.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Luetke KH, Sadowski PD
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