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Aminoglycoside binding sites in Escherichia coli as revealed by neomycin-gold labeling

H Morioka, M Tachibana, T Amagai and A Suganuma

A cytochemical technique for demonstration of neomycin binding sites by electron microscopy was developed and applied to Escherichia coli. Neomycin was conjugated chemically with bovine serum albumin (BSA). Colloidal gold was coated with the conjugated neomycin-BSA. The neomycin-BSA-gold was applied to thin sections of Epon-embedded E. coli and examined. Gold particles were observed on the outer membrane and the cytoplasmic membrane of E. coli. It was probably the ribosomes that were being labeled in the cytoplasm. Different cytochemical controls, including a number of inhibition tests and the use of BSA-gold, proved the specificity of this cytochemical technique and provided the biochemical significance of the observations.

Volume 34, Issue 7, pp. 909-912, 07/01/1986
Copyright © 1986 by The Histochemical Society


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