Synthesis of an N-acyl sulfamate analog of luciferyl-AMP: a stable and potent inhibitor of firefly luciferase |
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Authors: | Branchini Bruce R Murtiashaw Martha H Carmody Jill N Mygatt Emily E Southworth Tara L |
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Institution: | Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, CT 06320, USA. brbra@conncoll.edu |
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Abstract: | In the first of two half-reactions resulting in the emission of visible light, firefly luciferase forms luciferyl-adenylate from its natural substrates beetle luciferin and Mg-ATP. The acyl-adenylate is subsequently oxidized producing the light emitter oxyluciferin in an electronically excited state. In vitro, under mild conditions of temperature and pH, the acyl-adenylate intermediate is readily hydrolyzed and susceptible to oxidation. We report here the multi-step synthesis and physical and enzymatic characterization of an N-acyl sulfamate analog of luciferyl-adenylate, 5'-O-(N-dehydroluciferyl)-sulfamoyl]-adenosine (compound 5). This represents the first example of a stable and potent (Ki = 340 nM) reversible inhibitor of firefly luciferase activity based on the structure of the natural acyl-adenylate intermediate. Additionally, we present the results of limited proteolysis studies that demonstrate that the binding of the novel acyl-adenylate analog protects luciferase from proteolysis. The findings presented here are interpreted in the context of the hypothesis that luciferase and the other enzymes in a large superfamily of adenylate-forming proteins adopt two conformations to catalyze two different partial reactions. We anticipate that the novel N-acyl sulfamate analog will be a valuable reagent in future studies designed to elucidate the role of conformational changes in firefly luciferase catalyzed bioluminescence. |
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