Summary
The amino acid sequence, arginine-glycine-aspartic acid (RGD), found in some cell adhesive proteins, is a recognition signal for the receptor protein. It is interesting that we have found the RGD sequence in terminal protein (TP) of bacteriophages ϕ29 and M2 near an amino acid, the serine residue at 232, covalently linked to the terminal nucleotide of their DNAs. At the initiation of proteinprimed DNA replication, TP is essential for the recognition of replication machinery containing DNA polymerase and primer protein (PP; PP becomes TP upon linking the first nucleotide, and hence the primary structure of TP is the same as that of PP). Synthetic peptide RGD specifically inhibited transfection of ϕ29 and M2. The target of the RGD peptide is shown to be TP by marker rescue experiments, suggesting that a receptor for the RGD sequence exists in TP. Furthermore, the peptide inhibited the in vitro protein-priming reaction of DNA replication. We propose that the RGD sequence of PP and a putative receptor on TP is utilized for the molecular recognition initiating DNA replication.
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Kobayashi, H., Matsumoto, K., Misawa, S. et al. An inhibitory effect of RGD peptide on protein, priming reaction of bacteriophages ϕ29 and M2. Molec. Gen. Genet. 220, 8–11 (1989). https://doi.org/10.1007/BF00260848
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DOI: https://doi.org/10.1007/BF00260848