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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+Pathog
2015 ; 11
(4
): e1004835
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gab.com Text
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English Wikipedia
Conserved Streptococcus pneumoniae spirosomes suggest a single type of
transformation pilus in competence
#MMPMID25876066
Laurenceau R
; Krasteva PV
; Diallo A
; Ouarti S
; Duchateau M
; Malosse C
; Chamot-Rooke J
; Fronzes R
PLoS Pathog
2015[Apr]; 11
(4
): e1004835
PMID25876066
show ga
The success of S. pneumoniae as a major human pathogen is largely due to its
remarkable genomic plasticity, allowing efficient escape from antimicrobials
action and host immune response. Natural transformation, or the active uptake and
chromosomal integration of exogenous DNA during the transitory differentiated
state competence, is the main mechanism for horizontal gene transfer and genomic
makeover in pneumococci. Although transforming DNA has been proposed to be
captured by Type 4 pili (T4P) in Gram-negative bacteria, and a
competence-inducible comG operon encoding proteins homologous to T4P-biogenesis
components is present in transformable Gram-positive bacteria, a prevailing
hypothesis has been that S. pneumoniae assembles only short pseudopili to
destabilize the cell wall for DNA entry. We recently identified a
micrometer-sized T4P-like pilus on competent pneumococci, which likely serves as
initial DNA receptor. A subsequent study, however, visualized a different
structure--short, 'plaited' polymers--released in the medium of competent S.
pneumoniae. Biochemical observation of concurrent pilin secretion led the authors
to propose that the 'plaited' structures correspond to transformation pili acting
as peptidoglycan drills that leave DNA entry pores upon secretion. Here we show
that the 'plaited' filaments are not related to natural transformation as they
are released by non-competent pneumococci, as well as by cells with disrupted
pilus biogenesis components. Combining electron microscopy visualization with
structural, biochemical and proteomic analyses, we further identify the 'plaited'
polymers as spirosomes: macromolecular assemblies of the fermentative
acetaldehyde-alcohol dehydrogenase enzyme AdhE that is well conserved in a broad
range of Gram-positive and Gram-negative bacteria.