Tuntland ML, Fung LWM. Substrate independent ATPase activity may complicate high throughput screening.
Anal Biochem 2016;
510:18-20. [PMID:
27430931 DOI:
10.1016/j.ab.2016.07.016]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 07/13/2016] [Accepted: 07/14/2016] [Indexed: 10/21/2022]
Abstract
Inorganic phosphate release, [Pi], is often measured in an enzymatic reaction in a high throughput setting. Based on the published mechanism, we designed a protocol for our screening for inhibitors of SAICAR synthetase (PurC), and we found a gradual increase in [Pi] in positive control samples over the course of the day. Further investigation indicated that hydrolysis of ATP catalyzed by PurC, rather than substrate-related phosphate release, was responsible for a partial contribution to the signals in the control samples. Thus substrate-independent ATPase activity may complicate high throughput screening.
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