4jln | pdb_00004jln
Human dCK C4S-S74E mutant in complex with UDP and the F2.4.1 inhibitor (2-[({2-[3-(2-FLUOROETHOXY)-4-METHOXYPHENYL]-5-PROPYL-1,3-THIAZOL-4-YL}METHYL)SULFANYL]PYRIMIDINE-4,6-DIAMINE)
Structural highlights
FunctionDCK_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.[1] [2] Publication Abstract from PubMedDeoxycytidine kinase (dCK) is a key enzyme in the nucleoside salvage pathway that is also required for the activation of several anticancer and antiviral nucleoside analog prodrugs. Additionally, dCK has been implicated in immune disorders and has been found to be overexpressed in several cancers. To allow the probing and modulation of dCK activity, a new class of small-molecule inhibitors of the enzyme were developed. Here, the structural characterization of four of these inhibitors in complex with human dCK is presented. The structures reveal that the compounds occupy the nucleoside-binding site and bind to the open form of dCK. Surprisingly, a slight variation in the nature of the substituent at the 5-position of the thiazole ring governs whether the active site of the enzyme is occupied by one or two inhibitor molecules. Moreover, this substituent plays a critical role in determining the affinity, improving it from >700 to 1.5 nM in the best binder. These structures lay the groundwork for future modifications that would result in even tighter binding and the correct placement of moieties that confer favorable pharmacodynamics and pharmacokinetic properties. Structural characterization of new deoxycytidine kinase inhibitors rationalizes the affinity-determining moieties of the molecules.,Nomme J, Murphy JM, Su Y, Sansone ND, Armijo AL, Olson ST, Radu C, Lavie A Acta Crystallogr D Biol Crystallogr. 2014 Jan;70(Pt 1):68-78. doi:, 10.1107/S1399004713025030. Epub 2013 Dec 24. PMID:24419380[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
| ||||||||||||||||||
