@article{Hartig2004Small-15638,
  year={2004},
  doi={10.1093/nar/gnh149},
  title={Small circular DNAs for synthesis of the human telomere repeat : Varied sizes, structures and telomere-encoding activities},
  number={19},
  volume={32},
  journal={Nucleic Acids Research},
  pages={e152--e152},
  author={Hartig, Jörg S. and Kool, Eric T.}
}

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    <dcterms:bibliographicCitation>Publ. in: Nucleic acids research ; 32 (2004), 19. - pp. e152</dcterms:bibliographicCitation>
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    <dc:creator>Hartig, Jörg S.</dc:creator>
    <dcterms:issued>2004</dcterms:issued>
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    <dcterms:abstract xml:lang="eng">We describe the construction, structural properties and enzymatic substrate abilities of a series of circular DNA oligonucleotides that are entirely composed of the C-rich human telomere repeat, (CCCTAA)n. The nanometer-sized circles range in length from 36 to 60 nt, and act as templates for synthesis of human telomere repeats in vitro. The circles were constructed successfully by the application of a recently developed adenine-protection strategy, which allows for cyclization/ligation with T4 DNA ligase. Thermal denaturation studies showed that at pH 5.0, all five circles form folded structures with similar stability, while at pH 7.0 no melting transitions were seen. Circular dichroism spectra at the two pH conditions showed evidence for i-motif structures at the lower pH value. The series was tested as rolling circle templates for a number of DNA polymerases at pH = 7.3–8.5, using 18mer telomeric primers. Results showed that surprisingly small circles were active, although the optimum size varied from enzyme to enzyme. Telomeric repeats 1000 nt in length could be synthesized in 1 h by the Klenow (exo-) DNA polymerase. The results establish a convenient way to make long human telomeric repeats for in vitro study of their folding and interactions, and establish optimum molecules for carrying this out.</dcterms:abstract>
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    <dc:contributor>Kool, Eric T.</dc:contributor>
    <dcterms:title>Small circular DNAs for synthesis of the human telomere repeat : Varied sizes, structures and telomere-encoding activities</dcterms:title>
    <dc:creator>Kool, Eric T.</dc:creator>
    <dc:contributor>Hartig, Jörg S.</dc:contributor>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-10-07T14:14:28Z</dc:date>
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