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Kinetic Characterization of the Shigella Type Three Secretion System ATPase Spa47 Using α- 32 P ATP.
Bio-protocol 2018 November 6
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-32 P ATPase assay.
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