Journal
BIOCHEMISTRY
Volume 48, Issue 10, Pages 2125-2134Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bi802269f
Keywords
-
Categories
Funding
- NIH [GM 75965]
Ask authors/readers for more resources
HMGB proteins are abundant non-histone components of eukaryotic chromatin. The biological function of DNA sequence-nonspecific HMGB proteins is obscure. These proteins are composed of one or two conserved HMG box domains, each forming three a-helices that fold into a sequence-nonspecific DNA-binding module recognizing the DNA minor groove. Box A and box B homology domains have subtle sequence differences such that box B domains bend DNA strongly while DNA bending by isolated box A domains is weaker. Both box A and box B domains preferentially bind to distorted DNA structures. Here we show using DNA cyclization kinetics assays in vitro and Escherichia coli DNA looping assays in vivo that an isolated HMG box A domain derived from human HMGB2 folds poorly and does not enhance apparent DNA flexibility. Surprisingly, Substitution of a small number of cationic residues from the N-terminal leader of a functional yeast box B protein, Nhp6Ap, confers the ability to enhance DNA flexibility. These results demonstrate important roles for cationic leader amino acids in HMGB folding, DNA interaction, and DNA bending.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available