ATP-dependent DNA aggregation is a novel function of rat serum albumin

Okot Nyormoi, Robb E. Moses

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

An ATP-dependent DNA aggregating activity was purified from rat liver by DEAE-cellulose, phosphocellulose, and novobiocin-Sepharose column chromatography. The protein aggregated superhelical, relaxed, single-, or double-stranded DNA in a divalent cation- and ATP-dependent reaction. The DNA aggregating activity was detected by retardation of a DNA-protein complex at the origin on a 1% agarose gel. The protein appeared to exist in solution as a monomer of molecular weight 66,000, and had no DNA polymerase, topoisomerase, recombinase, or ligase activity. The DNA aggregating activity was inhibited by 10 mm nalidixic acid or 1 mm novobiocin but not by 20 mm N-ethylmaleimide or camptothecin. Adenylyl(β,γ-methylene)-diphosphonate, adenylyl-imidodiphosphate, or adenosine-5′-O(3-thiotriphosphate) did not substitute for ATP whereas CTP, dTTP, or the ATP analog adenylyl(α,β-methylene)-diphosphonate could replace ATP. The aggregated DNA was only partially dissociated by restriction endonuclease digestion but was completely dissociated by deproteinization with SDS, proteinase K, or chloroform/octanol extraction. On the basis of the molecular weight, thermostability, antigenic property, and amino acid sequence homology in the first 12 positions, we conclude that the rat liver protein is serum albumin and that the ATP-dependent DNA aggregation is a novel function of rat serum albumin.

Original languageEnglish (US)
Pages (from-to)367-371
Number of pages5
JournalArchives of Biochemistry and Biophysics
Volume287
Issue number2
DOIs
StatePublished - Jun 1991

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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