DNA-binding protein HupB

UniProtKB accession:  A5U6Z7

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UniProtKB description:  A nucleoid-associated protein (NAP) that plays a role in local chromosome architecture (PubMed:24916461) (Probable). Binds DNA non-sequence specifically; in vitro phosphorylation of an N-terminal fragment decreases DNA-binding (PubMed:24816602). Stimulates supercoiling relaxation by topoisomerase 1 (Top1, topA), at higher than 80 uM inhibits relaxation, has no effect on DNA gyrase; the effect is independent of DNA-binding. Increases the intervening strand passage activity of Top1 that occurs between the two catalytic trans-esterification reactions (PubMed:25200077). Does not bind ssDNA, probably helps condense chromosomes (PubMed:24916461). Binds dsDNA; in vitro acetylated protein binds 10-fold less well to DNA (note in vitro acetylated protein is more heavily modified than in vivo modified protein). In vitro acetylated protein compacts DNA less well than unmodified protein (PubMed:26817737, PubMed:28935371). In vitro succinylated DNA bind dsDNA less well than unmodified protein (note in vitro succinylated protein is more heavily modified than in vivo modified protein) (PubMed:34224344).