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. 1993 Feb 25;21(4):1025–1029. doi: 10.1093/nar/21.4.1025

Evidence for opposite groove-directed curvature of GGGCCC and AAAAA sequence elements.

I Brukner 1, M Dlakic 1, A Savic 1, S Susic 1, S Pongor 1, D Suck 1
PMCID: PMC309239  PMID: 8451169

Abstract

The repetitive sequence (AGGGCCCTAGAGGGGCCC-TAG)n was previously shown to be curved by gel mobility assays. Here we show, using hydroxy radical/DNase I digestion and differential helical phasing experiments that the curvature is directed towards the major groove and is located in the GGGCCC, but not the CTAGAG segments. The effect of the GC step in the context of the GGGCCC motif is apparently about as large as that of AA/TT, i.e. enough to cancel the macroscopic curvature of helically phased A-tracts. These data are in agreement with positive roll-like curvature of the GCC/GGC motif, predicted from nucleosome packing data and the 3D structure of the GGGGCCCC octamer, but they are not in agreement with the dinucleotide-based roll angle values predicted for AG/CT, TA, GG/CC and GC steps. Our results thus indicate the importance of interactions beyond the dinucleotide steps in predictive models of DNA curvature.

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Selected References

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