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. 1975 Jan;72(1):83–87. doi: 10.1073/pnas.72.1.83

A routine method for protein-free spreading of double- and single-stranded nucleic acid molecules.

H J Vollenweider, J M Sogo, T Koller
PMCID: PMC432245  PMID: 164030

Abstract

A protein-free nucleic acid preparation method for electron microscopy is described. The basic procedure is very similar to the classical protein monolayer spreading techniques. The carrier protein (usually cytochrome c) is replaced by benzyldimethylalkylammonium chloride. Both the hypophase method and the microdiffusion or droplet method can be applied with this compound. Unlike cytochrome c, benzyldimethylalkylammonium chloride does not lead to any apparent thickening of the nucleic acid strands. Partially denatured DNA spread with this reagent shows a loosened structure with a foamy appearance in the regions previously considered to be "unmelted," which open up locally into melted loops of different size. Specifically bound proteins, such as RNA polymerase on bacteriophage T7 DNA, can be detected unambiguously.

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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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