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. 1984 Sep 25;12(18):7071–7086. doi: 10.1093/nar/12.18.7071

Changes in site specificity of single-strand-specific endonucleases on supercoiled PM2 DNA with temperature and ionic environment.

D Kowalski
PMCID: PMC320143  PMID: 6091053

Abstract

Mung bean nuclease sites in supercoiled PM2 DNA at neutral pH were located by linearizing the singly-nicked circular DNA product with venom phosphodiesterase followed by restriction endonuclease mapping. The locations of the sites varied with small changes in temperature and in concentration of NaC1 or magnesium ion. Different environmental changes which affect duplex stability in the same direction showed similar effects on the number of sites and in some cases resulted in identical cleavage patterns. Venom phosphodiesterase and P1 nuclease showed cleavage patterns similar to mung bean nuclease under the same environmental conditions and showed similar variations in cleavage patterns when environmental conditions were changed. Relaxed, closed-circular DNA was slowly cleaved at numerous sites whose locations did not vary with environment. Changes in site specificity are likely the result of environmental effects on the conformation of supercoiled DNA as opposed to effects on the single-strand-specific endonucleases themselves.

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Selected References

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