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Eur J Biochem. 1997 Jul 1;247(1):136-41.

High-molecular-mass complexes of human minichromosome-maintenance proteins in mitotic cells.

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1
Division of Biology, Universit├Ąt Konstanz, Germany.

Abstract

Minichromosome-maintenance (Mcm) proteins perform essential functions regulating the replication of eukaryotic genomes. In interphase cells they are either bound to a nuclear structure, most probably chromatin, or occur as free multiprotein complexes in the nucleoplasm. Mcm proteins are displaced from their chromatin sites during S phase, and several become highly phosphorylated during mitosis. We investigated whether phosphorylation affects the ability of mitotic Mcm proteins to form multiprotein complexes. Our results clearly show that phosphorylated mitotic Mcm proteins form a 14-15-S complex, probably consisting of one molecule each of the six known human Mcm proteins.

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