Abstract
The ability of the chromosomal high mobility group protein HMG 2 to recognize supercoil-dependent structures within the chicken adult beta-globin gene was investigated by examining its ability to protect such sites from digestion by S1 nuclease. Low molar ratios of HMG 2 were found to be sufficient for complete inhibition of S1 cleavage of a supercoiled plasmid containing the globin gene. Furthermore, HMG 2 protected an S1 cleavage site within the 5'-flanking region of the globin gene, in preference to a palindromic S1 site within the plasmid vector.
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