The binding of protein HU from Escherichia coli to nucleic acids was investigated by affinity chromatography under various conditions, by a nitrocellulose retention assay and by isopycnic centrifugations in metrizamide gradients. The results indicate that HU has a preference for binding to RNA and single-stranded DNA over double-stranded DNA. The affinity of HU for supercoiled DNA was also less than that of the corresponding relaxed DNA.
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Holck et al. (1985) studied this question.
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