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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 Environ+Microbiol
2013 ; 15
(8
): 2238-53
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A spider web strategy of type IV pili-mediated migration to build a fibre-like
Psl polysaccharide matrix in Pseudomonas aeruginosa biofilms
#MMPMID23425591
Wang S
; Parsek MR
; Wozniak DJ
; Ma LZ
Environ Microbiol
2013[Aug]; 15
(8
): 2238-53
PMID23425591
show ga
Bacterial motilities participate in biofilm development. However, it is unknown
how/if bacterial motility affects formation of the biofilm matrix. Psl
polysaccharide is a key biofilm matrix component of Pseudomonas aeruginosa. Here
we report that type IV pili (T4P)-mediated bacterial migration leads to the
formation of a fibre-like Psl matrix. Deletion of T4P in wild type and
flagella-deficient strains results in loss of the Psl-fibres and reduction of
biofilm biomass in flow cell biofilms as well as pellicles at air-liquid
interface. Bacteria lacking T4P-driven twitching motility including those that
still express surface T4P are unable to form the Psl-fibres. Formation of a
Psl-fibre matrix is critical for efficient biofilm formation, yet does not
require flagella and polysaccharide Pel or alginate. The Psl-fibres are likely
formed by Psl released from bacteria during T4P-mediated migration, a strategy
similar to spider web formation. Starvation can couple Psl release and T4P-driven
twitching motility. Furthermore, a radial-pattern Psl-fibre matrix is present in
the middle of biofilms, a nutrient-deprived region. These imply a plausible model
for how bacteria respond to nutrient-limited local environment to build a
polysaccharide-fibre matrix by T4P-dependent bacterial migration strategy. This
strategy may have general significance for bacterial survival in natural and
clinical settings.