This study aimed to develop a practical and high-affinity fluorescent probe for uridine diphosphate glucuronosyltransferase 1A1 (UGT1A1), a key conjugative enzyme responsible for the elimination and detoxification of many potentially harmful compounds. Several substrates derived from N-butyl-4-phenyl-1,8-naphthalimide were designed and synthesized on the basis of the substrate preference of UGT1A1 and the principle of photoinduced electron transfer (PET). Following the preliminary screening, substrate 2 was found with a high specificity and high affinity toward UGT1A1, while such biotransformation brought remarkable changes in fluorescence emission. Both inhibition kinetic analyses and molecular docking simulations demonstrated that 2 could bind on UGT1A1 at the same ligand-binding site as bilirubin. Furthermore, this newly developed probe was successfully used for sensing UGT1A1 activities and the high-throughput screening of UGT1A1 modulators in complex biological samples. In conclusion, a practical and high-affinity fluorescent probe for UGT1A1 was designed and well-characterized, which could serve as a good surrogate for bilirubin to investigate UGT1A1-ligand interactions.
[1]Shanghai Univ Tradit Chinese Med, Inst Interdisciplinary Med, Shanghai 201203, Peoples R China.
[2]Dalian Minzu Univ, Coll Life Sci, Dalian 116600, Peoples R China.
[3]Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China.
[4]Dalian Med Univ, Dalian 116044, Peoples R China.
[5]Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China.
[6]US FDA, Ctr Drug Evaluat & Res, Silver Spring, MD 20903 USA.
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