2a30 | pdb_00002a30

Crystal structure of human deoxycytidine kinase in complex with deoxycytidine

spinqualitylabelsall models 2a30, resolution 3.02Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2a30 is a 4 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, DCZ Related: 2a2z Gene: DCK (HUMAN) Activity: Deoxycytidine kinase, with EC number 2.7.1.74 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [DCK_HUMAN] Required for the phosphorylation of the deoxyribonucleosides deoxycytidine (dC), deoxyguanosine (dG) and deoxyadenosine (dA). Has broad substrate specificity, and does not display selectivity based on the chirality of the substrate. It is also an essential enzyme for the phosphorylation of numerous nucleoside analogs widely employed as antiviral and chemotherapeutic agents. 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 Human deoxycytidine kinase (dCK) uses nucleoside triphosphates to phosphorylate several clinically important prodrugs in addition to its natural substrates. Although UTP is the preferred phosphoryl donor for this reaction, our previous studies reported dCK structures solely containing ADP in the phosphoryl donor binding site. To determine the molecular basis of the kinetically observed phosphoryl donor preference, we solved crystal structures of a dCK variant lacking a flexible insert (residues 65-79) but having similar catalytic properties as wild type, in complex with deoxycytidine (dC) and UDP, and in the presence of dC but the absence of UDP or ADP. These structures reveal major changes in the donor base binding loop (residues 240-247) between the UDP-bound and ADP-bound forms, involving significant main-chain rearrangement. This loop is disordered in the dCK-dC structure, which lacks a ligand at the phosphoryl donor site. In comparison with the ADP-bound form, in the presence of UDP this loop is shifted inward to make closer contact to the smaller uracil base. These structures illuminate the phosphoryl donor binding and preference mechanisms of dCK. Structural basis for the preference of UTP over ATP in human deoxycytidine kinase: illuminating the role of main-chain reorganization.,Godsey MH, Ort S, Sabini E, Konrad M, Lavie A Biochemistry. 2006 Jan 17;45(2):452-61. PMID:16401075 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Deoxycytidine kinase 3D structures

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