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- W1492433730 abstract "Previous studies with HCHO have revealed a reaction with superhelical DNA that strongly suggests that this DNA consists of small regions of interrupted secondary structure. To map these sites in PM2 DNA, the following set of experiments was performed using electron microscopy. (i) A denaturation map of nicked form II was obtained using Inman's alkaline-HCHO conditions. (ii) The superhelical form I was reacted with HCHO at 30 C until equilibrium was achieved at the interrupted sites (3.6% reactivity). The excess HCHO was removed rapidly and X-ray treatment was employed to nick these prereacted molecules. These form II molecules containing HCHO (form II HCHO) were also subjected to denaturation mapping. It would be expected that the HCHO-unpaired regions would serve as induction sites for the propagation of melting. Hence, depending on the location of the induction sites; we would anticipate either the creation of new regions of melting or a normal denaturation map shifted to lower pH values. Comparison of the development of progressive denaturation of form II and form II HCHO reveals that the latter is the case. The denaturation maps of form II are highly organized patterns of adenine-thymine (AT)-rich regions, with a total of five regions at extreme pH conditions. There are six highly organized regions for form II HCHO, i.e., smaller adjacent loops, at low denaturation conditions where no denaturation is seen for form II. These coalesce into the pattern for form II containing four of five A-T-rich regions observed for form II. Hence we conclude that the regions of altered hydrogen bonding in superhelical PM2 DNA are four to six in number and they map in the A-T-rich regions of the DNA." @default.
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- W1492433730 date "1974-06-01" @default.
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- W1492433730 title "Locating Interrupted Hydrogen Bonding in the Secondary Structure of PM2 Circular DNA by Comparative Denaturation Mapping" @default.
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- W1492433730 doi "https://doi.org/10.1128/jvi.13.6.1176-1185.1974" @default.
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