
Full text loading...
SUMMARY: The intracellular esterases of 25 strains of Escherichia coli, growing exponentially on a minimal medium, were analysed by the acrylamide-agarose zymogram technique.
Five kinds of esterase bands were defined: three major bands (A, B and C) and two minor ones. The A and B esterase bands hydrolysed α-naphthyl, β-naphythl and indoxyl acetates; they were inhibited by di-iso-fluoropropyl phosphate (DFP). Esterase band B also hydrolysed the α- and β-naphthyl butyrates and was stable at 60°C. Esterase band C hydrolysed only β-naphthyl acetate and it resisted DFP. The A, B and C esterase bands showed variations in electrophoretic mobility which seemed to indicate an intraspecific differentiation of molecular structures of the esterase that could have arisen during microbial evolution.
Article metrics loading...
Full text loading...
References
Data & Media loading...