title: Detection of subunit interfacial modifications by tracing the evolution of clamp-loader complex.
abstract: The archaeal and eukaryal clamp-loader and clamp proteins were investigated with the evolutionary trace method. The molecular phylogeny of the proteins suggested that the hetero-pentameric complex of the archaeal clamp-loader with two subunits (RFCL and RFCS) was not a preserved ancestral type, but a degenerated version of the eukaryal complex of five subunits (RFC1-5). The evolutionary trace of amino acid replacements during the course of subunit differentiation revealed that the replacements had accumulated preferentially at the subunit interface regions. Some of the interfacial modifications that might be responsible for the specific interaction between the subunits were conserved in the current complex.
authors.affiliation: Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors.forename: Mihoko
authors.initials: M
authors.lastname: Saito
authors.forename: Takuji
authors.initials: T
authors.lastname: Oyama
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Shirai
mesh_terms: D019843:Archaeal Proteins / Q000737:chemistry; D001426:Bacterial Proteins / Q000737:chemistry; D030562:Databases, Protein; D019281:Dimerization; D019143:Evolution, Molecular; D005656:Fungal Proteins / Q000737:chemistry; D008958:Models, Molecular; D015233:Models, Statistical; D010802:Phylogeny; D011485:Protein Binding; D011487:Protein Conformation; D015202:Protein Engineering / Q000379:methods*; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000737:chemistry*; D055672:Static Electricity; D014961:X-Ray Diffraction
chemical_list: D019843:Archaeal Proteins; D001426:Bacterial Proteins; D005656:Fungal Proteins; D011506:Proteins