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Mol. Cell. Biol., Dec 1997, 7159-7168, Vol 17, No. 12
DG Lee and SP Bell
In many organisms, the replication of DNA requires the binding of a protein
called the initiator to DNA sites referred to as origins of replication.
Analyses of multiple initiator proteins bound to their cognate origins have
provided important insights into the mechanism by which DNA replication is
initiated. To extend this level of analysis to the study of eukaryotic
chromosomal replication, we have investigated the architecture of the
Saccharomyces cerevisiae origin recognition complex (ORC) bound to yeast
origins of replication. Determination of DNA residues important for
ORC-origin association indicated that ORC interacts preferentially with one
strand of the ARS1 origin of replication. DNA binding assays using ORC
complexes lacking one of the six subunits demonstrated that the DNA binding
domain of ORC requires the coordinate action of five of the six ORC
subunits. Protein-DNA cross-linking studies suggested that recognition of
origin sequences is mediated primarily by two different groups of ORC
subunits that make sequence-specific contacts with two distinct regions of
the DNA. Implications of these findings for ORC function and the mechanism
of initiation of eukaryotic DNA replication are discussed.
Copyright © 1997, American Society for Microbiology
Architecture of the yeast origin recognition complex bound to origins of DNA replication
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA.
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