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. 1978 Feb;75(2):710–714. doi: 10.1073/pnas.75.2.710

Discrete length classes of DNA depend on mode of dehydration.

H J Vollenweider, A James, W Szybalski
PMCID: PMC411326  PMID: 273234

Abstract

The length of double-stranded coliphage lambda DNA, as determined by electron microscopy using the benzyldimethylalkyl ammonium chloride technique, depends on the mode of dehydration. The freeze-dried DNA form is the longest (16.5 micron), whereas dehydration in methanol (15.9 micron) or in ethanol (three forms: 15.2 micron, 13.9 micron, and 12.4 micron) results in progressively shorter molecules. These measured lengths of the freeze-dried, methanol-dehydrated, and shortest ethanol-dehydrated forms correspond to the axial rise per nucleotide pair in the B, C, and A forms of DNA, respectively. The remaining forms of ethanol-dehydrated DNA seem to represent novel intermediary conformations of DNA. In agreement with the predicted increment, DNA exposed to ethidium bromide and freeze-dried is elongated by 39% (22.9 micron). All size classes show the same relative distribution pattern of bound Escherichia coli RNA polymerase molecules (nucleoside triphosphate:RNA nucleotidyltransferase, EC2.7.7.6), used as intramolecular markers, indicating that the dehydration-caused transitions are uniform.

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Selected References

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