© The Rockefeller University Press,
0021-9525/1998//271 $5.00
The Journal of Cell Biology, Volume 140, Number 2,
, 1998 271-281
Identification of a Preinitiation Step in DNA Replication That Is Independent of Origin Recognition Complex and cdc6, but Dependent on cdk2
Xuequn Helen Hua and
John Newport
Biology Department, University of California, San Diego, CA 92093-0347
Before initiation of DNA replication, origin recognition complex (ORC) proteins, cdc6, and minichromosome maintenance (MCM) proteins bind to chromatin sequentially and form preinitiation complexes. Using Xenopus laevis egg extracts, we find that after the formation of these complexes and before initiation of DNA replication, cdc6 is rapidly removed from chromatin, possibly degraded by a cdk2-activated, ubiquitin-dependent proteolytic pathway. If this displacement is inhibited, DNA replication fails to initiate. We also find that after assembly of MCM proteins into preinitiation complexes, removal of the ORC from DNA does not block the subsequent initiation of replication. Importantly, under conditions in which both ORC and cdc6 protein are absent from preinitiation complexes, DNA replication is still dependent on cdk2 activity. Therefore, the final steps in the process leading to initiation of DNA replication during S phase of the cell cycle are independent of ORC and cdc6 proteins, but dependent on cdk2 activity.
Abbreviations used in this paper: ELB, egg lysis buffer; MCM, minichromosome maintenance; ORC, origin recognition complex.
Address all correspondence to J. Newport, Biology Department, 0347, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0347. Tel.: (619) 534-3423. Fax: (619) 534-0555. E-mail: jnewport{at}ucsd.edu

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