Bayen M, Dalmon J. 5-Methylcytosine in Chlorelle pyrenoidosa DNAs.
BIOCHIMICA ET BIOPHYSICA ACTA 1976;
432:273-80. [PMID:
1268256 DOI:
10.1016/0005-2787(76)90136-2]
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Abstract
The presence of 5-methylcytosine in Chlorella pyrenoidosa (strain 211/8b) DNA's has been investigated by means of paper chromatography and thermal chromatography on hydroxyapatite. It has been shown that nuclear DNA contains 3.5 mol% 5-methylcytosine whereas no significant amount of this base can be detected in chloroplast DNA. The thermal chromatography of nuclear DNA labelled from [6-3H]- or [Me-14C] methionine lead us to conclude that the 5-methylcytosine content is directly proportional to the G + C content of the various DNA fractions. The existence of methylated sequences in DNA is postulated and the biological function of the 5-methylcytosine is discussed.
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