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A more recent version of this article appeared on November 10, 2000
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M007167200v1
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Papers In Press, published online ahead of print August 28, 2000
J. Biol. Chem, 10.1074/jbc.M007167200
Submitted on August 8, 2000
Revised on August 28, 2000
Accepted on August 28, 2000

A role of basic residues and the putative intercalating phenylalanine of the HMG1-box B in DNA supercoiling and binding to four-way DNA junctions

Michal Stros and Eva Muselikova

Institute of Biophysics, Brno 612 65

Corresponding Author: stros{at}ibp.cz

HMG-1 is a chromosomal protein with two homologous DNA-binding domains, the HMG-boxes A and B. HMG-1, like its individual HMG-boxes, can recognize structural distortion of DNA, such as four-way DNA junctions (4WJs), that are very likely to have features common to their natural, yet unknown, cellular binding targets. HMG-1 can also bend/loop DNA and introduce negative supercoils in the presence of topoisomerase I in topologically closed DNAs. Results of our gel shift assays demonstrate that mutation of Arg97 within the extended N-terminal strand of the B domain significantly (> 50-fold) decreases affinity of the HMG-box for 4WJs and alters the mode of binding without changing the structural-specificity for 4WJs. Several basic amino acids of the extended N-terminal strand (Lys96/Arg97) and helix I (Arg110/Lys114) of the B domain participate in DNA binding and supercoiling. The putative intercalating hydrophobic Phe103 of helix I is important for DNA supercoiling but dispensable for binding to supercoiled DNA and 4WJs. We conclude that the B domain of HMG-1 can tolerate substitutions of a number of amino acid residues without abolishing the structure-specific recognition of 4WJs, while mutations of most of these residues severely impair the topoisomerase I-mediated DNA supercoiling and change the sign of supercoiling from negative to positive.


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