NDLI: Novel DNA Binding Properties of the Mcm10 Protein from Saccharomyces cerevisiae *

Content Provider	PubMed Central
Author	Eisenberg, Shlomo George, Korza Carson, John Ivan, Liachko Tye, Bik-kwoon
Abstract	The Mcm10 protein is essential for chromosomal DNA replication in eukaryotic cells. We purified the Saccharomyces cerevisiae Mcm10 (ScMcm10) and characterized its DNA binding properties. Electrophoretic mobility shift assays and surface plasmon resonance analysis showed that ScMcm10 binds stably to both double strand (ds) DNA and single strand (ss) DNA. On short DNA templates of 25 or 50 bp, surface plasmon resonance analysis showed a ∼1:1 stoichiometry of ScMcm10 to dsDNA. On longer dsDNA templates, however, multiple copies of ScMcm10 cooperated in the rapid assembly of a large, stable nucleoprotein complex. The amount of protein bound was directly proportional to the length of the DNA, with an average occupancy spacing of 21–24 bp. This tight spacing is consistent with a nucleoprotein structure in which ScMcm10 is aligned along the helical axis of the dsDNA. In contrast, the stoichiometry of ScMcm10 bound to ssDNA of 20–50 nucleotides was ∼3:1 suggesting that interaction with ssDNA induces the assembly of a multisubunit ScMcm10 complex composed of at least three subunits. The tight packing of ScMcm10 on dsDNA and the assembly of a multisubunit complex on ssDNA suggests that, in addition to protein-DNA, protein-protein interactions may be involved in forming the nucleoprotein complex. We propose that these DNA binding properties have an important role in (i) initiation of DNA replication and (ii) formation and maintenance of a stable replication fork during the elongation phase of chromosomal DNA replication.
Related Links	http://dx.doi.org/10.1074/jbc.M109.033175
Starting Page	25412
File Format	PDF
ISSN	1083351X
e-ISSN	1083351X
Journal	The Journal of Biological Chemistry
Issue Number	37
Volume Number	284
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	2009-09-11
Access Restriction	Open
Rights Holder	American Society for Biochemistry and Molecular Biology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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