Phosphorylation of the PCNA binding domain of the large subunit of replication factor C by Ca2+/calmodulin-dependent protein kinase II inhibits DNA synthesis

TY - JOUR

T1 - Phosphorylation of the PCNA binding domain of the large subunit of replication factor C by Ca2+/calmodulin-dependent protein kinase II inhibits DNA synthesis

AU - Maga, G

AU - Mossi, R

AU - Fischer, R

AU - Berchtold, M W

AU - Hübscher, U

N1 - Keywords: Animals; Binding Sites; Calcium-Calmodulin-Dependent Protein Kinases; Cattle; DNA Polymerase II; DNA Polymerase III; DNA Replication; DNA-Binding Proteins; DNA-Directed DNA Polymerase; Homeodomain Proteins; Humans; Phosphorylation; Proliferating Cell Nuclear Antigen; Proto-Oncogene Proteins c-bcl-2; Replication Protein C; Repressor Proteins; Saccharomyces cerevisiae Proteins

PY - 1997

Y1 - 1997

N2 - Replication factor C (RF-C) is a heteropentameric protein essential for DNA replication and DNA repair. It is a molecular matchmaker required for loading of the proliferating cell nuclear antigen (PCNA) sliding clamp onto double-strand DNA and for PCNA-dependent DNA synthesis by DNA polymerases delta and epsilon. The DNA and PCNA binding domains of the large 140 kDa subunit of human RF-C have been recently cloned [Fotedar, R., Mossi, R., Fitzgerald, P., Rousselle, T., Maga, G., Brickner, H., Messier, H., Khastilba. S., Hübscher, U., & Fotedar, A. (1996) EMBO J. 15, 4423-4433]. Here we show that the PCNA binding domain is phosphorylated by the Ca2+/calmodulin-dependent protein kinase II (CaMKII), an enzyme required for cell cycle progression in eukaryotic cells. The DNA binding domain, on the other hand, is not phosphorylated. Phosphorylation by CaMKII reduces the binding of PCNA to RF-C and consequently inhibits RF-C-dependent DNA synthesis by DNA polymerases delta1 and epsilon. Once bound to PCNA and DNA, RF-C is protected from phosphorylation by CaMKII, suggesting a possible role of CaMKII in regulating the dynamics of interaction between PCNA and RF-C and thus interfering in the formation of an active sliding clamp by DNA polymerases delta and epsilon.

AB - Replication factor C (RF-C) is a heteropentameric protein essential for DNA replication and DNA repair. It is a molecular matchmaker required for loading of the proliferating cell nuclear antigen (PCNA) sliding clamp onto double-strand DNA and for PCNA-dependent DNA synthesis by DNA polymerases delta and epsilon. The DNA and PCNA binding domains of the large 140 kDa subunit of human RF-C have been recently cloned [Fotedar, R., Mossi, R., Fitzgerald, P., Rousselle, T., Maga, G., Brickner, H., Messier, H., Khastilba. S., Hübscher, U., & Fotedar, A. (1996) EMBO J. 15, 4423-4433]. Here we show that the PCNA binding domain is phosphorylated by the Ca2+/calmodulin-dependent protein kinase II (CaMKII), an enzyme required for cell cycle progression in eukaryotic cells. The DNA binding domain, on the other hand, is not phosphorylated. Phosphorylation by CaMKII reduces the binding of PCNA to RF-C and consequently inhibits RF-C-dependent DNA synthesis by DNA polymerases delta1 and epsilon. Once bound to PCNA and DNA, RF-C is protected from phosphorylation by CaMKII, suggesting a possible role of CaMKII in regulating the dynamics of interaction between PCNA and RF-C and thus interfering in the formation of an active sliding clamp by DNA polymerases delta and epsilon.

U2 - 10.1021/bi962809n

DO - 10.1021/bi962809n

M3 - Journal article

C2 - 9154912

SN - 0006-2960

VL - 36

SP - 5300

EP - 5310

JO - Biochemistry

JF - Biochemistry

IS - 18

ER -