Tv. Korneenko et al., The identification of nitrate reductase from Escherichia coli as the antigen for a monoclonal antibody of unknown specificity, BIOORG KHIM, 26(8), 2000, pp. 601-604
The immunoaffinity chromatography of total membrane proteins from Escherich
ia coli helped determine the specificity of the monoclonal antibody 3A6 tha
t was obtained upon immunization of mice with nicotinamide nucleotide trans
hydrogenase preparations and reacted with an unknown E. coli antigen. Prote
ins with apparent molecular masses of 150, 45, and 20 kDa were isolated and
identified by N-terminal sequencing as the subunits of nitrate reductase.
This conclusion was confirmed by immunoblotting with the 3A6 antibody of th
e proteins from the E. coil cells grown upon induction of nitrate reductase
. It was shown that the 3A6 antibody specifically recognizes the a subunit
of nitrate reductase, and the formation of the enzyme-antibody complex does
not result in a loss of the enzyme catalytic activity.