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2015 ; 5
(ä): 14352
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English Wikipedia
Crystal structure of Streptococcus pneumoniae pneumolysin provides key insights
into early steps of pore formation
#MMPMID26403197
Lawrence SL
; Feil SC
; Morton CJ
; Farrand AJ
; Mulhern TD
; Gorman MA
; Wade KR
; Tweten RK
; Parker MW
Sci Rep
2015[Sep]; 5
(ä): 14352
PMID26403197
show ga
Pore-forming proteins are weapons often used by bacterial pathogens to breach the
membrane barrier of target cells. Despite their critical role in infection
important structural aspects of the mechanism of how these proteins assemble into
pores remain unknown. Streptococcus pneumoniae is the world's leading cause of
pneumonia, meningitis, bacteremia and otitis media. Pneumolysin (PLY) is a major
virulence factor of S. pneumoniae and a target for both small molecule drug
development and vaccines. PLY is a member of the cholesterol-dependent cytolysins
(CDCs), a family of pore-forming toxins that form gigantic pores in cell
membranes. Here we present the structure of PLY determined by X-ray
crystallography and, in solution, by small-angle X-ray scattering. The crystal
structure reveals PLY assembles as a linear oligomer that provides key structural
insights into the poorly understood early monomer-monomer interactions of CDCs at
the membrane surface.