  Simple elastic network models of DNA were developed to reveal the
structure-dynamics relationships for several nucleotide sequences. First, we
propose a simple all-atom elastic network model of DNA that can explain the
profiles of temperature factors for several crystal structures of DNA. Second,
we propose a coarse-grained elastic network model of DNA, where each nucleotide
is described only by one node. This model could effectively reproduce the
detailed dynamics obtained with the all-atom elastic network model according to
the sequence-dependent geometry. Through normal-mode analysis for the
coarse-grained elastic network model, we exhaustively analyzed the dynamic
features of a large number of long DNA sequences, approximately $\sim 150$ bp
in length. These analyses revealed positive correlations between the
nucleosome-forming abilities and the inter-strand fluctuation strength of
double-stranded DNA for several DNA sequences.
