Primer recognition proteins (PRP) are cofactors for DNA polymerase alpha and may have a role in lagging-strand DNA replication. PRP is composed of two subunits, which we have previously identified as the protein-tyrosine kinase substrate annexin II and phosphoglycerate kinase (PGK). In this study, we have examined the physiological involvement of these proteins in DNA synthesis and cell proliferation. When exponentially growing human HeLa cells are exposed to antisense phosphorothioate oligodeoxynucleotides to annexin II, ongoing DNA synthesis is reduced. The extent of reduction with antisense oligodeoxynucleotide to PGK was much less than with the antisense annexin II oligodeoxynucleotide. Reductions in the labeling and mitotic indices of HeLa cell cultures are seen after exposure to antisense oligodeoxynucleotides. Flow cytometric analyses indicate that progression from S phase to G2 phase of the cycle is retarded by exposure of cells to the antisense oligodeoxynucleotides. Corresponding sense oligodeoxynucleotides have no inhibitory effects on these parameters. The new synthesis of annexin II and PGK is specifically reduced in the presence of antisense oligodeoxynucleotides, indicating that the complex of newly synthesized annexin II and PGK may participate in PRP function. These experiments indicate that annexin II and PGK may have a physiological role in DNA synthesis and cell cycle progression, and represent the first physiological role for annexin II monomer in cells.

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