2W3O
Crystal structure of the human PNKP FHA domain in complex with an XRCC1-derived phosphopeptide
Summary for 2W3O
Entry DOI | 10.2210/pdb2w3o/pdb |
Related | 1CDZ 1XNA 1XNT 2BRF 2D8M |
Descriptor | BIFUNCTIONAL POLYNUCLEOTIDE PHOSPHATASE/KINASE, DNA REPAIR PROTEIN XRCC1, CALCIUM ION, ... (4 entities in total) |
Functional Keywords | hydrolase, transferase/peptide, fha, pnkp, xrcc1, kinase, nucleus, polynucleotide kinase 3' phosphatase, dna damage, dna repair, transferase, atp-binding, multifunctional enzyme, polymorphism, phosphoprotein, phospho- peptide, nucleotide-binding, base excision repair, transferase-peptide complex |
Biological source | HOMO SAPIENS (HUMAN) More |
Cellular location | Nucleus: Q96T60 P18887 |
Total number of polymer chains | 4 |
Total formula weight | 26507.24 |
Authors | Oliver, A.W.,Ali, A.A.E.,Pearl, L.H. (deposition date: 2008-11-13, release date: 2009-02-03, Last modification date: 2024-10-16) |
Primary citation | Ali, A.A.E.,Jukes, R.M.,Pearl, L.H.,Oliver, A.W. Specific Recognition of a Multiply Phosphorylated Motif in the DNA Repair Scaffold Xrcc1 by the Fha Domain of Human Pnk. Nucleic Acids Res., 37:1701-, 2009 Cited by PubMed Abstract: Short-patch repair of DNA single-strand breaks and gaps (SSB) is coordinated by XRCC1, a scaffold protein that recruits the DNA polymerase and DNA ligase required for filling and sealing the damaged strand. XRCC1 can also recruit end-processing enzymes, such as PNK (polynucleotide kinase 3'-phosphatase), Aprataxin and APLF (aprataxin/PNK-like factor), which ensure the availability of a free 3'-hydroxyl on one side of the gap, and a 5'-phosphate group on the other, for the polymerase and ligase reactions respectively. PNK binds to a phosphorylated segment of XRCC1 (between its two C-terminal BRCT domains) via its Forkhead-associated (FHA) domain. We show here, contrary to previous studies, that the FHA domain of PNK binds specifically, and with high affinity to a multiply phosphorylated motif in XRCC1 containing a pSer-pThr dipeptide, and forms a 2:1 PNK:XRCC1 complex. The high-resolution crystal structure of a PNK-FHA-XRCC1 phosphopeptide complex reveals the basis for this unusual bis-phosphopeptide recognition, which is probably a common feature of the known XRCC1-associating end-processing enzymes. PubMed: 19155274DOI: 10.1093/NAR/GKN1086 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (1.85 Å) |
Structure validation
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