N-Sulfomethylation of guanine, adenine and cytosine with formaldehyde-bisulfite. A selective modification of guanine in DNA. |
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| Authors: | H Hayatsu Y Yamashita S Yui Y Yamagata K Tomita K Negishi |
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| Abstract: | When guanine-, adenine- and cytosine-nucleosides and nucleotides were treated with formaldehyde and then with bisulfite, stable N-sulfomethyl compounds were formed. N2-Sulfomethylguanine, N6-sulfomethyladenine, N4-sulfomthylcytosine and N6-sulfomethyl-9-beta-D-arabinofuranosyladenine were isolated as crystals and characterized. A guanine-specific sulfomethylation was brought about by treatment and denatured single-stranded DNA with formaldehyde and then with bisulfite at pH 7 and 4 degrees C. Since native double-stranded DNA was not modified by this treatment, this new method of modification is expected to be useful as a conformational probe for polynucleotides. |
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