Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
Characterization of the interaction between topoisomerase II and DNA by transcriptional footprinting. / Thomsen, B; Bendixen, C; Lund, K et al.
In: Journal of Molecular Biology, Vol. 215, No. 2, 20.09.1990, p. 237-44.Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
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TY - JOUR
T1 - Characterization of the interaction between topoisomerase II and DNA by transcriptional footprinting
AU - Thomsen, B
AU - Bendixen, C
AU - Lund, K
AU - Andersen, A H
AU - Sørensen, B S
AU - Westergaard, O
PY - 1990/9/20
Y1 - 1990/9/20
N2 - The interaction between calf thymus topoisomerase II and DNA has been characterized using a transcription assay. A highly preferred recognition sequence for topoisomerase II was inserted in either direction downstream from a promoter specific for a bacteriophage RNA polymerase. The presence of topoisomerase II-DNA complexes on the template provoked blockage of transcription, yielding RNA transcripts terminated 5' to the topoisomerase II binding site. A footprint of topoisomerase II, derived from transcription towards the complex from either side, revealed that eukaryotic topoisomerase II binds a region of 28 base-pairs with a highly protected central core of 22 base-pairs. The binding region was located symmetrically around the topoisomerase II-mediated cleavage site. In agreement with this result, optimal topoisomerase II-mediated cleavage was observed with a DNA substrate consisting of a 28-mer oligonucleotide homologous to the protected region. Stepwise removal of base-pairs from the ends of the 28-mer gradually reduced the level of enzyme-mediated cleavage.
AB - The interaction between calf thymus topoisomerase II and DNA has been characterized using a transcription assay. A highly preferred recognition sequence for topoisomerase II was inserted in either direction downstream from a promoter specific for a bacteriophage RNA polymerase. The presence of topoisomerase II-DNA complexes on the template provoked blockage of transcription, yielding RNA transcripts terminated 5' to the topoisomerase II binding site. A footprint of topoisomerase II, derived from transcription towards the complex from either side, revealed that eukaryotic topoisomerase II binds a region of 28 base-pairs with a highly protected central core of 22 base-pairs. The binding region was located symmetrically around the topoisomerase II-mediated cleavage site. In agreement with this result, optimal topoisomerase II-mediated cleavage was observed with a DNA substrate consisting of a 28-mer oligonucleotide homologous to the protected region. Stepwise removal of base-pairs from the ends of the 28-mer gradually reduced the level of enzyme-mediated cleavage.
KW - Acetanilides
KW - Animals
KW - Base Sequence
KW - Binding Sites
KW - Cattle
KW - DNA
KW - DNA Topoisomerases, Type I
KW - DNA-Binding Proteins
KW - In Vitro Techniques
KW - Molecular Sequence Data
KW - Nitroimidazoles
KW - Transcription, Genetic
KW - Journal Article
KW - Research Support, Non-U.S. Gov't
U2 - 10.1016/S0022-2836(05)80342-0
DO - 10.1016/S0022-2836(05)80342-0
M3 - Journal article
C2 - 2170662
VL - 215
SP - 237
EP - 244
JO - Journal of Molecular Biology
JF - Journal of Molecular Biology
SN - 0022-2836
IS - 2
ER -