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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 J+Biol+Chem
2015 ; 290
(10
): 6457-69
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Functional amyloids keep quorum-sensing molecules in check
#MMPMID25586180
Seviour T
; Hansen SH
; Yang L
; Yau YH
; Wang VB
; Stenvang MR
; Christiansen G
; Marsili E
; Givskov M
; Chen Y
; Otzen DE
; Nielsen PH
; Geifman-Shochat S
; Kjelleberg S
; Dueholm MS
J Biol Chem
2015[Mar]; 290
(10
): 6457-69
PMID25586180
show ga
The mechanism by which extracellular metabolites, including redox mediators and
quorum-sensing signaling molecules, traffic through the extracellular matrix of
biofilms is poorly explored. We hypothesize that functional amyloids, abundant in
natural biofilms and possessing hydrophobic domains, retain these metabolites.
Using surface plasmon resonance, we demonstrate that the quorum-sensing (QS)
molecules, 2-heptyl-3-hydroxy-4(1H)-quinolone and
N-(3-oxododecanoyl)-l-homoserine lactone, and the redox mediator pyocyanin bind
with transient affinity to functional amyloids from Pseudomonas (Fap). Their high
hydrophobicity predisposes them to signal-amyloid interactions, but specific
interactions also play a role. Transient interactions allow for rapid association
and dissociation kinetics, which make the QS molecules bioavailable and at the
same time secure within the extracellular matrix as a consequence of serial
bindings. Retention of the QS molecules was confirmed using Pseudomonas
aeruginosa PAO1-based 2-heptyl-3-hydroxy-4(1H)-quinolone and
N-(3-oxododecanoyl)-l-homoserine lactone reporter assays, showing that Fap
fibrils pretreated with the QS molecules activate the reporters even after
sequential washes. Pyocyanin retention was validated by electrochemical analysis
of pyocyanin-pretreated Fap fibrils subjected to the same washing process.
Results suggest that QS molecule-amyloid interactions are probably important in
the turbulent environments commonly encountered in natural habitats.