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-Structure paper
タイトル | The architecture of the DNA replication origin recognition complex in Saccharomyces cerevisiae. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 105, Issue 30, Page 10326-10331, Year 2008 |
掲載日 | 2008年7月29日 |
著者 | Zhiqiang Chen / Christian Speck / Patricia Wendel / Chunyan Tang / Bruce Stillman / Huilin Li / |
PubMed 要旨 | The origin recognition complex (ORC) is conserved in all eukaryotes. The six proteins of the Saccharomyces cerevisiae ORC that form a stable complex bind to origins of DNA replication and recruit ...The origin recognition complex (ORC) is conserved in all eukaryotes. The six proteins of the Saccharomyces cerevisiae ORC that form a stable complex bind to origins of DNA replication and recruit prereplicative complex (pre-RC) proteins, one of which is Cdc6. To further understand the function of ORC we recently determined by single-particle reconstruction of electron micrographs a low-resolution, 3D structure of S. cerevisiae ORC and the ORC-Cdc6 complex. In this article, the spatial arrangement of the ORC subunits within the ORC structure is described. In one approach, a maltose binding protein (MBP) was systematically fused to the N or the C termini of the five largest ORC subunits, one subunit at a time, generating 10 MBP-fused ORCs, and the MBP density was localized in the averaged, 2D EM images of the MBP-fused ORC particles. Determining the Orc1-5 structure and comparing it with the native ORC structure localized the Orc6 subunit near Orc2 and Orc3. Finally, subunit-subunit interactions were determined by immunoprecipitation of ORC subunits synthesized in vitro. Based on the derived ORC architecture and existing structures of archaeal Orc1-DNA structures, we propose a model for ORC and suggest how ORC interacts with origin DNA and Cdc6. The studies provide a basis for understanding the overall structure of the pre-RC. |
リンク | Proc Natl Acad Sci U S A / PubMed:18647841 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 25.0 Å |
構造データ | EMDB-5013: |