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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
2017 ; 292
(10
): 4244-4254
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Streptococcus pyogenes Endopeptidase O Contributes to Evasion from
Complement-mediated Bacteriolysis via Binding to Human Complement Factor C1q
#MMPMID28154192
Honda-Ogawa M
; Sumitomo T
; Mori Y
; Hamd DT
; Ogawa T
; Yamaguchi M
; Nakata M
; Kawabata S
J Biol Chem
2017[Mar]; 292
(10
): 4244-4254
PMID28154192
show ga
Streptococcus pyogenes secretes various virulence factors for evasion from
complement-mediated bacteriolysis. However, full understanding of the molecules
possessed by this organism that interact with complement C1q, an initiator of the
classical complement pathway, remains elusive. In this study, we identified an
endopeptidase of S. pyogenes, PepO, as an interacting molecule, and investigated
its effects on complement immunity and pathogenesis. Enzyme-linked immunosorbent
assay and surface plasmon resonance analysis findings revealed that S. pyogenes
recombinant PepO bound to human C1q in a concentration-dependent manner under
physiological conditions. Sites of inflammation are known to have decreased pH
levels, thus the effects of PepO on bacterial evasion from complement immunity
was analyzed in a low pH condition. Notably, under low pH conditions, PepO
exhibited a higher affinity for C1q as compared with IgG, and PepO inhibited the
binding of IgG to C1q. In addition, pepO deletion rendered S. pyogenes more
susceptible to the bacteriocidal activity of human serum. Also, observations of
the morphological features of the pepO mutant strain (?pepO) showed damaged
irregular surfaces as compared with the wild-type strain (WT). WT-infected
tissues exhibited greater severity and lower complement activity as compared with
those infected by ?pepO in a mouse skin infection model. Furthermore, WT
infection resulted in a larger accumulation of C1q than that with ?pepO. Our
results suggest that interaction of S. pyogenes PepO with C1q interferes with the
complement pathway, which enables S. pyogenes to evade complement-mediated
bacteriolysis under acidic conditions, such as seen in inflammatory sites.