4XHU

The complex structure of Timeless_PAB and PARP-1_catalytic domain

Summary for 4XHU

• Entry DOI: 10.2210/pdb4xhu/pdb
• Related: 4XHT 4XHW
• Descriptor: Poly [ADP-ribose] polymerase 1, Protein timeless homolog, GLYCEROL, ... (6 entities in total)
• Functional Keywords: dna damage response, transferase-replication complex, transferase/replication
• Biological source: Homo sapiens (Human); More
• Cellular location: Nucleus: P09874 Q9UNS1
• Total number of polymer chains: 4
• Total formula weight: 103896.36

Authors

Xie, S.,Qian, C. (deposition date: 2015-01-06, release date: 2015-09-30, Last modification date: 2024-10-09)

Primary citation

Xie, S.,Mortusewicz, O.,Ma, H.T.,Herr, P.,Poon, R.R.,Helleday, T.,Qian, C.
Timeless Interacts with PARP-1 to Promote Homologous Recombination Repair.
Mol.Cell, 60:163-176, 2015

PubMed Abstract: Human Timeless helps stabilize replication forks during normal DNA replication and plays a critical role in activation of the S phase checkpoint and proper establishment of sister chromatid cohesion. However, it remains elusive whether Timeless is involved in the repair of damaged DNA. Here, we identify that Timeless physically interacts with PARP-1 independent of poly(ADP-ribosyl)ation. We present high-resolution crystal structures of Timeless PAB (PARP-1-binding domain) in free form and in complex with PARP-1 catalytic domain. Interestingly, Timeless PAB domain specifically recognizes PARP-1, but not PARP-2 or PARP-3. Timeless-PARP-1 interaction does not interfere with PARP-1 enzymatic activity. We demonstrate that rapid and transient accumulation of Timeless at laser-induced DNA damage sites requires PARP-1, but not poly(ADP-ribosyl)ation and that Timeless is co-trapped with PARP-1 at DNA lesions upon PARP inhibition. Furthermore, we show that Timeless and PARP-1 interaction is required for efficient homologous recombination repair.

PubMed: 26344098
DOI: 10.1016/j.molcel.2015.07.031

Experimental method

X-RAY DIFFRACTION (2.089 Å)