Case HB, Dickenson NE. Kinetic Characterization of the
Shigella Type Three Secretion System ATPase Spa47 Using α-
32P ATP.
Bio Protoc 2018;
8:e3074. [PMID:
30474049 PMCID:
PMC6247913 DOI:
10.21769/bioprotoc.3074]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/21/2018] [Accepted: 11/05/2018] [Indexed: 12/12/2022] Open
Abstract
ATPases represent a diverse class of enzymes that utilize ATP hydrolysis to support critical biological functions such as driving ion pumps, providing mechanical work, unfolding/folding proteins, and supporting otherwise thermodynamically unfavorable chemical reactions. We have recently shown that the Shigella protein Spa47 is an ATPase that supports protein secretion through its specialized type three secretion apparatus (T3SA), supporting infection of human host cells. Characterizing ATPases, such as Spa47, requires a means to accurately determine enzyme activity (ATP hydrolysis) as a function of time, reaction conditions, and potential cofactors, regulators, inhibitors, etc. Here, we describe a detailed protocol for characterizing the enzyme kinetics of Spa47 using a direct α-32P ATPase assay.
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