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  • Title: Primer protein of bacteriophage M2 exposes the RGD receptor site upon linking the first deoxynucleotide.
    Author: Kobayashi H, Kitabayashi K, Matsumoto K, Hirokawa H.
    Journal: Mol Gen Genet; 1991 Apr; 226(1-2):65-9. PubMed ID: 2034231.
    Abstract:
    Primer protein (PP) of bacteriophages M2 and phi 29 contains an Arg-Gly-Asp (RGD) sequence. The RGD-mediated protein-protein interaction in protein-primed DNA replication of M2 was studied in vitro using three purified and indispensable components: PP, DNA polymerase (POL) and template DNA linked to terminal protein (TP). PP competed with a synthetic RGD peptide for binding to the template DNA-TP complex (TP-DNA). In addition, POL bound to template TP-DNA only when complexed with PP. These results indicate that the RGD sequence of PP is responsible for the interaction of the PP-POL complex with TP-DNA, which contains the initiation site for the protein priming of DNA synthesis. At the moment when PP converts to TP upon linking the first deoxynucleotide, a conformational change results in exposure of the RGD binding site.
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