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Infect. Immun., 06 1996, 1956-1960, Vol 64, No. 6
Z Eichenbaum, BD Green and JR Scott
In many pathogenic bacteria, iron starvation serves as an environmental
signal that triggers the expression of virulence factors, many of which are
found on the cell surface or secreted into the culture supernatant. Using
the chelating agent nitrilotriacetic acid, we have established conditions
for iron starvation of the important human pathogen Streptococcus pyogenes
(the group A streptococcus) and determined that iron limitation results in
the specific appearance of several new proteins in the culture supernatant.
One of these supernatant proteins is the ADP-ribosylating protein known as
streptococcal plasmin receptor (Plr) or as the streptococcal surface
glyceraldehyde-3-phosphate- dehydrogenase because of its other activities.
Upon iron starvation, Plr is specifically released into the culture
supernatant in a time- dependent manner, and its appearance in the
supernatant is not accompanied by induction of plr mRNA synthesis. Release
of Plr from the bacteria may be important for the virulence of group A
streptococci and the manifestation of diseases.
Copyright © 1996, American Society for Microbiology
Iron starvation causes release from the group A streptococcus of the ADP-ribosylating protein called plasmin receptor or surface glyceraldehyde-3-phosphate-dehydrogenase
Department of Microbiology and Immunology, Emory University, Atlanta, Georgia 30322, USA.
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