Spa47 is an oligomerization-activated type three secretion system (T3SS) ATPase from Shigella flexneri.

ABSTRACT: Gram-negative pathogens often use conserved type three secretion systems (T3SS) for virulence. The Shigella type three secretion apparatus (T3SA) penetrates the host cell membrane and provides a unidirectional conduit for injection of effectors into host cells. The protein Spa47 localizes to the base of the apparatus and is speculated to be an ATPase that provides the energy for T3SA formation and secretion. Here, we developed an expression and purification protocol, producing active Spa47 and providing the first direct evidence that Spa47 is a bona fide ATPase. Additionally, size exclusion chromatography and analytical ultracentrifugation identified multiple oligomeric species of Spa47 with the largest greater than 8 fold more active for ATP hydrolysis than the monomer. An ATPase inactive

SUBMITTER: Burgess JL 

PROVIDER: S-EPMC4838647 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature