Abstract：
:PM2 DNA, forms I and II, were chemically modified with the ultimate carcinogen N-acetoxy-2-acetylaminofluorene. The products were subjected to 3 analytical procedures: (i) buoyant density centrifugation in the presence of the intercalating dyes ethidium bromide or propidium diiodide; (ii) agarose gel electrophoresis: and (iii) electron microscopy. It was found that carcinogen-modified DNAs banded at higher densities in the presence of either dye. This effect was far more pronounced with form I DNA than with form II. Form I DNA showed a concentration-dependent decrease of migration velocity in agarose gel electrophoresis after modification; form II DNA exhibited a similar but smaller effect. Electron microscopy of form I DNA did not reveal a consistent correlation between the extent of chemical modification and the loss of superhelical turns. Form II DNA exhibited characteristic alterations such as aggregation of several PM2 molecules into network-like structures, kinky configuration, and probably single-stranded bubbles extending over 600-1500 bases.
journal_name
Cancer Lettjournal_title
Cancer lettersauthors
Thielmann HW,Kuhn Cdoi
10.1016/0304-3835(80)90151-2subject
Has Abstractpub_date
1980-02-01 00:00:00pages
343-51issue
4eissn
0304-3835issn
1872-7980pii
0304-3835(80)90151-2journal_volume
8pub_type
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