2OD8
Structure of a peptide derived from Cdc9 bound to PCNA
Summary for 2OD8
| Entry DOI | 10.2210/pdb2od8/pdb |
| Descriptor | Proliferating cell nuclear antigen, DNA ligase I, mitochondrial precursor (3 entities in total) |
| Functional Keywords | homotrimer, pcna-peptide complex, pcna, protein binding |
| Biological source | Saccharomyces cerevisiae (baker's yeast) More |
| Cellular location | Nucleus: P15873 Isoform Mitochondrial: Mitochondrion. Isoform Nuclear: Nucleus: P04819 |
| Total number of polymer chains | 2 |
| Total formula weight | 31401.00 |
| Authors | Chapados, B.R.,Tainer, J.A. (deposition date: 2006-12-21, release date: 2007-05-01, Last modification date: 2023-08-30) |
| Primary citation | Vijayakumar, S.,Chapados, B.R.,Schmidt, K.H.,Kolodner, R.D.,Tainer, J.A.,Tomkinson, A.E. The C-terminal domain of yeast PCNA is required for physical and functional interactions with Cdc9 DNA ligase. Nucleic Acids Res., 35:1624-1637, 2007 Cited by PubMed Abstract: There is compelling evidence that proliferating cell nuclear antigen (PCNA), a DNA sliding clamp, co-ordinates the processing and joining of Okazaki fragments during eukaryotic DNA replication. However, a detailed mechanistic understanding of functional PCNA:ligase I interactions has been incomplete. Here we present the co-crystal structure of yeast PCNA with a peptide encompassing the conserved PCNA interaction motif of Cdc9, yeast DNA ligase I. The Cdc9 peptide contacts both the inter-domain connector loop (IDCL) and residues near the C-terminus of PCNA. Complementary mutational and biochemical results demonstrate that these two interaction interfaces are required for complex formation both in the absence of DNA and when PCNA is topologically linked to DNA. Similar to the functionally homologous human proteins, yeast RFC interacts with and inhibits Cdc9 DNA ligase whereas the addition of PCNA alleviates inhibition by RFC. Here we show that the ability of PCNA to overcome RFC-mediated inhibition of Cdc9 is dependent upon both the IDCL and the C-terminal interaction interfaces of PCNA. Together these results demonstrate the functional significance of the beta-zipper structure formed between the C-terminal domain of PCNA and Cdc9 and reveal differences in the interactions of FEN-1 and Cdc9 with the two PCNA interfaces that may contribute to the co-ordinated, sequential action of these enzymes. PubMed: 17308348DOI: 10.1093/nar/gkm006 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.8 Å) |
Structure validation
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