Localization and characterization of fibronectin-binding to group A streptococci. An electron microscopic study using protein-gold-complexes.
The location and nature of the binding sites for fibronectin (Fn) and its N-terminal 29 K fragment (FnF) on group A streptococci were studied by electron microscopy using these proteins labelled with colloidal gold. The investigated strains exhibited a different labelling intensity as well as a different labelling pattern varying from a strong regular distribution to a weak focal binding. Binding of Fn and FnF was inhibited by itself as well as by lipoteichoic acid (LTA), anti-LTA and concanavalin A. Simultaneous labelling of the bacteria with marker complexes of FnF, human serum albumin and fibrinogen revealed separate receptor sites for each protein. Our results confirmed LTA to be mainly responsible for the binding of Fn on group A streptococci.
Wagner
B
B
Central Institute of Microbiology and Experimental Therapy, Academy of Sciences of the GDR, Jena.
Schmidt
K H
KH
Wagner
M
M
Wadström
T
T
D001665:Binding Sites; D001667:Binding, Competitive; D003102:Colloids; D004591:Electrophoresis, Polyacrylamide Gel; D005353:Fibronectins / Q000378:metabolism*; D006046:Gold; D006651:Histocytochemistry; D006801:Humans; D008854:Microscopy, Electron; D010446:Peptide Fragments / Q000378:metabolism*; D013297:Streptococcus pyogenes / Q000378:metabolism* / Q000648:ultrastructure
D003102:Colloids; D005353:Fibronectins; D010446:Peptide Fragments; D006046:Gold