HMGB1 is an architectural protein in chromatin, acting also as a signaling molecule outside the cell. Recent reports from several laboratories provided evidence that a number of both the intracellular and extracellular functions of HMGB1 may depend on redox-sensitive cysteine residues of the protein. In this study we demonstrate that redox state of HMGB1 can significantly modulate the ability of the protein to bind and bend DNA, as well as to promote DNA end-joining. We also report a high affinity binding of histone H1 to hemicatenated DNA loops and DNA minicircles. Finally, we show that reduced HMGB1 can readily displace histone H1 from DNA, while oxidized HMGB1 has limited capacity for H1 displacement. Our results suggested a novel mechanism for the HMGB1-mediated modulation of histone H1 binding to DNA. Possible biological consequences of linker histones H1 replacement by HMGB1 for the functioning of chromatin are discussed.

Central European Institute of Technology Center of Molecular Medicine Masaryk University Brno Czech Republic

Laboratory of Analysis of Chromosomal Proteins Institute of Biophysics Academy of Science of the Czech Republic Brno Czech Republic

Laboratory of Analysis of Chromosomal Proteins Institute of Biophysics Academy of Science of the Czech Republic Brno Czech Republic ; Central European Institute of Technology Center of Molecular Medicine Masaryk University Brno Czech Republic

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