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Distinct CG and CNG DNA methyltransferases in Pisum sativum
Author(s) -
Pradhan Sriharsa,
Adams Roger L.P.
Publication year - 1995
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.1995.7030471.x
Subject(s) - methyltransferase , sativum , pisum , oligonucleotide , biochemistry , enzyme , dna methyltransferase , dna , biology , cytosine , microbiology and biotechnology , chemistry , botany , methylation
Summary DNA methyltransferase activity, present in low salt extracts of nuclei from young pea shoot apices, has been fractionated into two different species by assaying with model substrates. The CG methyltransferase (an unstable enzyme believed to be of 140 kDa) methylates cytosine only in oligonucleotides with CG and CI dinucleotide targets while an enzyme of 110 kDa (the CNG methyltransferase) methylates the cytosines in 5′‐CAG‐3′ and 5′‐CTG‐3′ target sequences, especially when hemimethylated, but not in 5′‐CCG‐3′ nor in 5′‐CGG‐3′ target sequences present in oligonucleotides.