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Originally published as MBC in Press, 10.1091/mbc.E02-11-0706 on March 7, 2003

Vol. 14, Issue 6, 2206-2215, June 2003

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Drosophila Mcm10 Interacts with Members of the Prereplication Complex and Is Required for Proper Chromosome Condensation

Tim W. Christensen, and Bik K. Tye *

Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14853-2703

Submitted November 4, 2002; Revised January 20, 2003; Accepted February 26, 2003
Monitoring Editor: Allan Spradling

Mcm10 is required for the initiation of DNA replication in Saccharomyces cerevisiae. We have cloned MCM10 from Drosophila melanogaster and show that it complements a ScMCM10 null mutant. Moreover, Mcm10 interacts with key members of the prereplication complex: Mcm2, Dup (Cdt1), and Orc2. Interactions were also detected between Mcm10 and itself, Cdc45, and Hp1. RNAi depletion of Orc2 and Mcm10 in KC cells results in loss of DNA content. Furthermore, depletion of Mcm10, Cdc45, Mcm2, Mcm5, and Orc2, respectively, results in aberrant chromosome condensation. The condensation defects observed resemble previously published reports for Orc2, Orc5, and Mcm4 mutants. Our results strengthen and extend the argument that the processes of chromatin condensation and DNA replication are linked.


Abbreviations used: pre-IC, preinitiation complex; pre-RC, prereplication complex; RNAi, RNA interference.

* Corresponding author. E-mail address: bt16{at}cornell.edu.




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