Real-Time Monitoring of Human Guanine Deaminase Activity by an Emissive Guanine Analog.
Real-Time Monitoring of Human Guanine Deaminase Activity by an Emissive Guanine Analog.
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DOI:
10.1021/acschembio.1c00232
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发表时间:
2021-07-16
影响因子:
4
通讯作者:
Tor, Yitzhak
中科院分区:
文献类型:
--
作者:
Bucardo, Marcela S.;Wu, You;Ludford, Paul T.;Li, Yao;Fin, Andrea;Tor, Yitzhak
Guanine deaminase (GDA) deaminates guanine to xanthine. Despite its significance, the study of human GDA remains limited compared to other metabolic deaminases. As a result, its substrate and inhibitor repertoire are limited, and effective real-time activity, inhibitory, and discovery assays are missing. Herein, we explore two emissive heterocyclic cores, based on thieno[3,4-d]pyrimidine (thN) and isothiazole[4,3-d]pyrimidine (tzN), as surrogate GDA substrates. We demonstrate that, unlike the thieno analog, thGN, the isothiazolo guanine surrogate, tzGN, does undergo effective enzymatic deamination by GDA and yields the spectroscopically distinct xanthine analog, tzXN. Further, we showcase the potential of this fluorescent nucleobase surrogate to provide a visible spectral window for a real-time study of GDA and its inhibition.
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