2jar | pdb_00002jar

Crystal structure of D12N variant of mouse cytosolic 5'(3')- deoxyribonucleotidase (cdN) in complex with deoxyuridine 5'- monophosphate

spinqualitylabelsall models 2jar, resolution 1.94Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2jar is a 1 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: MG, UMP Related: 2jao Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [NT5C_MOUSE] Dephosphorylates the 5' and 2'(3')-phosphates of deoxyribonucleotides, with a preference for dUMP and dTMP, intermediate activity towards dGMP, and low activity towards dCMP and dAMP. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Cytosolic 5'(3')-deoxyribonucleotidase (cdN) and mitochondrial 5'(3')-deoxyribonucleotidase (mdN) catalyze the dephosphorylation of deoxyribonucleoside monophosphates and regulate dTTP formation in cytosol and mitochondria, protecting DNA replication from imbalanced precursor pools. They can also interfere with the phosphorylation-dependent activation of nucleoside analogues used in anticancer and antiviral treatment. To understand the relatively narrow substrate specificity of these two enzymes and their ability to use nucleotide analogues as substrates, we determined the crystal structures of human cdN in complex with deoxyuridine, murine cdN in complex with dUMP and dGMP, and human mdN in complex with the nucleotide analogues AZTMP and BVdUMP. Our results show that the active site residues Leu45 and Tyr65 in cdN form a more favorable binding surface for purine nucleotides than the corresponding Trp75 and Trp76 in mdN, explaining why cdN has higher activity for purine nucleotides than does mdN. The molecular interactions of mdN with AZTMP and BVdUMP indicate why these nucleotide analogues are poorer substrates as compared with the physiological substrate, and they provide a structural rationale for the design of drugs that are less prone to inactivation by the deoxyribonucleotidases. We suggest that introduction of substituents in the 3'-position may result in nucleoside analogues with increased resistance to dephosphorylation. Crystal structures of human and murine deoxyribonucleotidases: insights into recognition of substrates and nucleotide analogues.,Wallden K, Rinaldo-Matthis A, Ruzzenente B, Rampazzo C, Bianchi V, Nordlund P Biochemistry. 2007 Dec 4;46(48):13809-18. Epub 2007 Nov 7. PMID:17985935 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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