Abstract
Similar to the protein segments with helical potential the three-dimensional structures of DNA sequences can be represented by a two-dimensional projection along the axis of the double helix. We will call this projection according to Schiffer and Edmundson “helical wheel”. In the first place the wheels are employed here as graphical restatements of known sequences which represent binding sites of restriction-modification enzymes. Specific recognition of these sites has to be based on sequence related multi contact interactions of weak bonds. Because of the spacial and directional characteristics of H-bonds we will utilize the pattern formation of H-bond donor — and acceptor groups protruding into the major groove of the helix to identify the particular sequences. The characteristics of these patterns can be readily visualized and compared by examination of these wheels.
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