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. 1986 May 12;14(9):3671–3686. doi: 10.1093/nar/14.9.3671

Novobiocin precipitates histones at concentrations normally used to inhibit eukaryotic type II topoisomerase.

M Cotten, D Bresnahan, S Thompson, L Sealy, R Chalkley
PMCID: PMC339807  PMID: 3714493

Abstract

At concentrations normally used to inhibit eukaryotic type II topoisomerase activity (100-1000 micrograms/ml) novobiocin binds core histones. Approximately 15 moles of novobiocin bind per mole of histone resulting in histone precipitation from solution in either 0.15 M or 2 M NaCl. The interaction between novobiocin and proteins appears to involve arginine residues: histones H3 and H4 (13.5 and 14 mole percent arginine) are precipitated at lower novobiocin concentrations than histones H2A and H2B (9.5 and 6.5 mole percent arginine). Furthermore, polyarginine but not polyornithine competes for novobiocin in histone precipitation. Moreover, histones with arginine residues modified with 1,2-cyclohexanedione are soluble in 1000 micrograms/ml novobiocin. Because novobiocin can remove histones from solution as well as inhibit topoisomerase activity, and because both of these events can alter DNA topology, novobiocin should be used with caution in experiments designed to implicate topoisomerase activity in chromatin dynamics.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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