title: Archaeology of eukaryotic DNA replication.
abstract: Recent advances in the characterization of the archaeal DNA replication system together with comparative genomic analysis have led to the identification of several previously uncharacterized archaeal proteins involved in replication and currently reveal a nearly complete correspondence between the components of the archaeal and eukaryotic replication machineries. It can be inferred that the archaeal ancestor of eukaryotes and even the last common ancestor of all extant archaea possessed replication machineries that were comparable in complexity to the eukaryotic replication system. The eukaryotic replication system encompasses multiple paralogs of ancestral components such that heteromeric complexes in eukaryotes replace archaeal homomeric complexes, apparently along with subfunctionalization of the eukaryotic complex subunits. In the archaea, parallel, lineage-specific duplications of many genes encoding replication machinery components are detectable as well; most of these archaeal paralogs remain to be functionally characterized. The archaeal replication system shows remarkable plasticity whereby even some essential components such as DNA polymerase and single-stranded DNA-binding protein are displaced by unrelated proteins with analogous activities in some lineages.
authors.affiliation: National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894.
authors.forename: Kira S
authors.initials: KS
authors.lastname: Makarova
authors.forename: Eugene V
authors.initials: EV
authors.lastname: Koonin
mesh_terms: D000818:Animals; D001105:Archaea / Q000378:metabolism*; D019070:Cell Lineage; D004261:DNA Replication; D004268:DNA-Binding Proteins / Q000378:metabolism; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism; D005057:Eukaryotic Cells / Q000378:metabolism*; D019143:Evolution, Molecular; D020745:Genome, Archaeal; D006801:Humans; D017017:Methanococcus / Q000378:metabolism; D051738:Origin Recognition Complex; D010802:Phylogeny
chemical_list: D004268:DNA-Binding Proteins; D051738:Origin Recognition Complex; D004259:DNA-Directed DNA Polymerase