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  • Title: Affinity photo-crosslinking study of the DNA base flipping pathway by HhaI methyltransferase.
    Author: Daujotyte D, Klimasauskas S.
    Journal: Nucleic Acids Symp Ser; 2000; (44):271-2. PubMed ID: 12903373.
    Abstract:
    HhaI DNA methyltransferase flips the inner cytosine in the recognition sequence 5'-GCGC-3' out of the DNA helix and into the catalytic site for methylation. To identify intermediate states on the base-flipping pathway, affinity photo-crosslinking experiments were performed with synthetic dodecamer duplexes containing modified bases 2-thiothymine (2sT) or 4-thiothymine (4sT) at the target base position. Here we show that the DNA strand containing 2sT, but not 4sT, covalently cross-links to the HhaI methyltransferase upon irradiation at 340-360 nm.
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