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  • Title: Studies on the function of conserved sequence motifs in the T4 Dam-[N6-adenine] and EcoRII [C5-cytosine] DNA methyltransferases.
    Author: Kossykh VG, Schlagman SL, Hattman S.
    Journal: Gene; 1995 May 19; 157(1-2):125-6. PubMed ID: 7607473.
    Abstract:
    We used site-directed oligodeoxyribonucleotide-mediated mutagenesis and kinetic studies with purified wild-type (wt) and mutant proteins to evaluate the role of the conserved sequence motifs in two prokaryotic DNA MTases. We suggest that: (i) the main role of Pro in the M.EcoRII PC-motif is to restrict the conformational freedom of Cys and orient it in a manner essential for catalysis; (ii) in both M.EcoRII and T4 Dam the FXGXG-motif positions AdoMet with respect to the catalytic site; (iii) the DPPY-motif in T4 Dam (region IV) is important for AdoMet-binding and may be part of the binding site; and (iv) the RXNXKXXFXXPFK-motif in T4 Dam (region III) is part of the DNA binding/recognition domain.
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