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We have used deoxyribonuclease I (DNase I) and methidium-propyl-EDTA.Fe(II) digestion to characterize the chromosomal structure of the single-copy autonomously replicating sequence ARS1. The major feature of this chromatin is a region of strong hypersensitivity to both cleavage agents. The hypersensitive region contains most of the DNA sequences which have been suggested by in vitro mutagenesis studies [Celniker, S., Sweder, K., Srienc, F., Bailey, J., & Campbell, J. (1984) Mol. Cell. Biol. 4, 2455-2466] to be important in ARS function. It lies at the downstream end of the TRP1 gene. A chromosomal DNase I footprinting analysis was carried out on the hypersensitive region. These data give direct evidence for several localized DNA/protein contacts within the hypersensitive region. The most prominent of these chromatin-dependent contacts is located on the functionally most important 11 base pairs of ARS DNA. On the TRP1 side of the hypersensitive region, there are positioned nucleosomes. On the other side of the hypersensitive region, there is a complex (and possibly heterogeneous) structure.
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