Linked Life Data

15276827

Source:http://linkedlifedata.com/resource/pubmed/id/15276827

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pubmed-article:15276827pubmed:abstractTextType III restriction enzymes are multifunctional heterooligomeric enzymes that cleave DNA at a fixed position downstream of a non-symmetric recognition site. For effective DNA cleavage these restriction enzymes need the presence of two unmethylated, inversely oriented recognition sites in the DNA molecule. DNA cleavage was proposed to result from ATP-dependent DNA translocation, which is expected to induce DNA loop formation, and collision of two enzyme-DNA complexes. We used scanning force microscopy to visualise the protein interaction with linear DNA molecules containing two EcoP15I recognition sites in inverse orientation. In the presence of the cofactors ATP and Mg(2+), EcoP15I molecules were shown to bind specifically to the recognition sites and to form DNA loop structures. One of the origins of the protein-clipped DNA loops was shown to be located at an EcoP15I recognition site, the other origin had an unspecific position in between the two EcoP15I recognition sites. The data demonstrate for the first time DNA translocation by the Type III restriction enzyme EcoP15I using scanning force microscopy. Moreover, our study revealed differences in the DNA-translocation processes mediated by Type I and Type III restriction enzymes.lld:pubmed
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pubmed-article:15276827pubmed:pagination337-43lld:pubmed
pubmed-article:15276827pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:15276827pubmed:year2004lld:pubmed
pubmed-article:15276827pubmed:articleTitleScanning force microscopy of DNA translocation by the Type III restriction enzyme EcoP15I.lld:pubmed
pubmed-article:15276827pubmed:affiliationInstitute of Virology (Helmut-Ruska-Haus), Charité Medical School, Humboldt University, Schumannstr. 20-21, D-10117 Berlin, Germany.lld:pubmed
pubmed-article:15276827pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15276827pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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