Statistical analysis of conformational properties of periodic dinucleotide steps in nucleosomes
ABSTRACT
Deformability of DNA is important for its superhelical folding in the nucleosome and has long been thought to be facilitated by periodic occurrences of certain dinucleotides along the sequences, with the period close to 10.5 bases. This study statistically examines the conformational properties of dinucleotides containing the 10.5 - base periodicity and those without that periodicity through scanning all nucleosome structures provided in PDB. By categorizing performances on the distribution of step parameter values, averaged net values, standard deviations and deformability based on step conformational energies, we give a detailed description as to the deformation preferences correlated with the periodicity for the 10 unique types of dinucleotides and summarize the possible roles of various steps in how they facilitate DNA bending. The results show that the structural properties of dinucleotide steps are influenced to various extents by the periodicity in nucleosomes and some periodic steps have shown a clear tendency to take specific bending or shearing patterns.
Deformability of DNA is important for its superhelical folding in the nucleosome and has long been thought to be facilitated by periodic occurrences of certain dinucleotides along the sequences, with the period close to 10.5 bases. This study statistically examines the conformational properties of dinucleotides containing the 10.5 - base periodicity and those without that periodicity through scanning all nucleosome structures provided in PDB. By categorizing performances on the distribution of step parameter values, averaged net values, standard deviations and deformability based on step conformational energies, we give a detailed description as to the deformation preferences correlated with the periodicity for the 10 unique types of dinucleotides and summarize the possible roles of various steps in how they facilitate DNA bending. The results show that the structural properties of dinucleotide steps are influenced to various extents by the periodicity in nucleosomes and some periodic steps have shown a clear tendency to take specific bending or shearing patterns.
Cite this paper
nullYang, X. and Ya, H. (2010) Statistical analysis of conformational properties of periodic dinucleotide steps in nucleosomes. Journal of Biomedical Science and Engineering, 3, 331-339. doi: 10.4236/jbise.2010.34046.
nullYang, X. and Ya, H. (2010) Statistical analysis of conformational properties of periodic dinucleotide steps in nucleosomes. Journal of Biomedical Science and Engineering, 3, 331-339. doi: 10.4236/jbise.2010.34046.
References
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