3zvm

The structural basis for substrate recognition by mammalian polynucleotide kinase 3' phosphatase

spinqualitylabelsall models 3zvm, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3zvm is a 4 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, ADP, EPE, GOL, MG Related: 1ujx, 3zvl, 1yj5, 1yjm, 3zvn Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PNKP_MOUSE] Plays a key role in the repair of DNA damage, functioning as part of both the non-homologous end-joining (NHEJ) and base excision repair (BER) pathways. Through its two catalytic activities, PNK ensures that DNA termini are compatible with extension and ligation by either removing 3'-phosphates from, or by phosphorylating 5'-hydroxyl groups on, the ribose sugar of the DNA backbone. Publication Abstract from PubMed Mammalian polynucleotide kinase 3' phosphatase (PNK) plays a key role in the repair of DNA damage, functioning as part of both the nonhomologous end-joining (NHEJ) and base excision repair (BER) pathways. Through its two catalytic activities, PNK ensures that DNA termini are compatible with extension and ligation by either removing 3'-phosphates from, or by phosphorylating 5'-hydroxyl groups on, the ribose sugar of the DNA backbone. We have now determined crystal structures of murine PNK with DNA molecules bound to both of its active sites. The structure of ssDNA engaged with the 3'-phosphatase domain suggests a mechanism of substrate interaction that assists DNA end seeking. The structure of dsDNA bound to the 5'-kinase domain reveals a mechanism of DNA bending that facilitates recognition of DNA ends in the context of single-strand and double-strand breaks and suggests a close functional cooperation in substrate recognition between the kinase and phosphatase active sites. The structural basis for substrate recognition by Mammalian polynucleotide kinase 3' phosphatase.,Garces F, Pearl LH, Oliver AW Mol Cell. 2011 Nov 4;44(3):385-96. PMID:22055185 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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