Immunoelectron microscopic analysis of elongation of type 1 fimbriae in Escherichia coli.
Using 10- and 20-nm-diameter gold particles conjugated to an antifimbrial monoclonal antibody, we analyzed the location of assembly of newly formed subunits on growing type 1 fimbriae of Escherichia coli. Fimbriae were removed from an E. coli K-12-derived strain, CSH50, by blending. Blended cells were allowed to regenerate their fimbriae in growth medium for approximately 25 min, after which they were labeled with a 20-nm-gold-monoclonal antibody probe. Continued outgrowth of these labeled fimbriae was allowed for additional time intervals, after which they were labeled with a 10-nm-gold-monoclonal antibody probe. The resulting fimbriae, double labeled with 10- and 20-nm-diameter gold particles, were examined in an electron microscope. The pattern of labeling on individual fimbrial organelles indicated morphologically that newly synthesized subunits are added to a growing organelle at its base.
D000911:Antibodies, Monoclonal; D004926:Escherichia coli / Q000648:ultrastructure*; D010861:Fimbriae, Bacterial / Q000276:immunology / Q000648:ultrastructure*; D007158:Immunologic Techniques; D008854:Microscopy, Electron
D000911:Antibodies, Monoclonal