Functional interaction between the bovine papillomavirus virus type 1 replicative helicase E1 and cyclin E-Cdk2.
We have found that the replicative helicase E1 of bovine papillomavirus type 1 (BPV-1) interacts with a key cell cycle regulator of S phase, the cyclin E-Cdk2 kinase. The E1 helicase, which interacts with cyclin E and not with Cdk2, presents the highest affinity for catalytically active kinase complexes. In addition, E1, cyclin E, and Cdk2 expressed in Xenopus egg extracts are quantitatively coimmunoprecipitated from crude extracts by either anti-Cdk2 or anti-E1 antibodies. E1 protein is also a substrate of the cyclin E-Cdk2 kinase in vitro. Using the viral components required for in vitro BPV-1 replication and free-membrane cytosol from Xenopus eggs, we show that efficient replication of BPV plasmids is dependent on the addition of E1-cyclin E-Cdk2 complexes. Thus, the BPV initiator of replication and cyclin E-Cdk2 are likely to function together as a protein complex which may be the key to the cell cycle regulation of papillomavirus replication.
Centre de Recherches de Biochimie Macromoléculaire, CNRS, UPR 1086, 34293 Montpellier Cedex 5, France.
N
N
Cueille
R
R
Nougarede
F
F
Mechali
M
M
Philippe
C
C
Bonne-Andrea
D000595:Amino Acid Sequence; D000818:Animals; D052688:Bovine papillomavirus 1 / Q000235:genetics / Q000378:metabolism*; D042846:CDC2-CDC28 Kinases; D002417:Cattle; D019927:Cyclin E / Q000378:metabolism*; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases / Q000378:metabolism*; D004265:DNA Helicases / Q000235:genetics / Q000378:metabolism*; D004261:DNA Replication; D004279:DNA, Viral; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D007399:Interphase; D008969:Molecular Sequence Data; D010063:Ovum; D010766:Phosphorylation; D010957:Plasmids; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism*; D014981:Xenopus; D029867:Xenopus Proteins
D019927:Cyclin E; D004279:DNA, Viral; D004268:DNA-Binding Proteins; C069814:E1 protein, Bovine papillomavirus; D011993:Recombinant Fusion Proteins; D014764:Viral Proteins; D029867:Xenopus Proteins; D017346:Protein Serine-Threonine Kinases; D042846:CDC2-CDC28 Kinases; C495891:Cdk2 protein, Xenopus; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases; D004265:DNA Helicases