ArticleAnalytical biochemistry2021
pH-dependent sedimentation of DNA in the presence of divalent, but not monovalent, metal ions.
Article in Analytical biochemistry, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 7 citations in OpenAlex.
- The role of the 2'-OH group in phase separation and percolation transitions of RNA.Nature communications · 2026Article
- The Critical Role of the 2'-OH group in Phase Separation and Percolation Transitions of RNA.bioRxiv : the preprint server for biology · 2026Article
- Simultaneous inactivation of antibiotic-resistant bacteria and degradation of antibiotic-resistant genes in alkalised human urine.Frontiers in microbiology · 2025Article
- Spectrophotometric and nucleic acid-binding properties of halloysite clay nanotubes and kaolinite.Heliyon · 2023Article
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Authors and funding
7 authors at 1 institution in 1 country.
Funding
Abstract
Precipitation of DNA is performed frequently in molecular biology laboratories for the purpose of purification and concentration of samples and also for transfer of DNA into cells. Metal ions are used to facilitate these processes, though their precise functions are not well characterized. In the current study we have investigated the precipitation of double-stranded DNA by group 1 and group 2 metal ions. Double-stranded DNAs were not sedimented efficiently by metals alone, even at high concentrations. Increasing the pH to 11 or higher caused strong DNA precipitation in the presence of the divalent group 2 metals magnesium, calcium, strontium and barium, but not group 1 metals. Group 2 sedimentation profiles were distinctly different from that of the transition metal zinc, which caused precipitation at pH 8. Analysis of DNAs recovered from precipitates formed with calcium revealed that structural integrity was retained and that sedimentation efficiency was largely size-independent above 400 bp. Several tests supported a model whereby single-stranded DNA regions formed by denaturation at high pH became bound by the divalent metal cations. Neutralization of negative surface charges reduced the repulsive forces between molecules, leading to formation of insoluble aggregates that could be further stabilized by cation bridging (ionic crosslinking).
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Registered trials
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