Abstract
A procedure is described for the production of monoclonal antibodies (mAbs) against 3α,20β-hydroxysteroid dehydrogenase (3α,20β-HSD) from the actinomycete Streptomyces hydrogenans ATCC 19631. Clones which were obtained after fusion of immune cells were screened by solid-phase ELISA and immunoblotting. About 5.2% of the clones secreted immunoglobulins with specificity for 3α,20β-HSD. The purified mAbs were found to belong to subclass IgG1 and to recognize both the native enzyme as well as its identical subunits which were obtained by SDS denaturation. However, the activity of the tetrameric holoenzyme was only weakly diminished in the presence of these mAbs.
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