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. 1985 Dec;50(3):800–806. doi: 10.1128/iai.50.3.800-806.1985

Cloning of Mycobacterium bovis BCG DNA and expression of antigens in Escherichia coli.

J E Thole, H G Dauwerse, P K Das, D G Groothuis, L M Schouls, J D van Embden
PMCID: PMC261151  PMID: 3905615

Abstract

A gene bank of Mycobacterium bovis BCG DNA in Escherichia coli was constructed by cloning Sau3A-cleaved mycobacterium DNA fragments into the lambda vector EMBL3. The expression of mycobacterial antigens was analyzed by Western blotting with hyperimmune rabbit sera. Among 770 clones tested, several were found that produced various mycobacterial antigens in low amounts, with concentrations generally close to the detection limit. One particular clone was chosen for further investigation. This clone produced a 64-kilodalton (kDa) antigen. By placing the lambda promoter PL in front of the structural gene of this antigen, an overproducing E. coli strain was obtained. Rocket-line immunoelectrophoresis experiments showed that antigens cross-reacting with the 64-kDa protein are present in a wide variety of mycobacteria and also in so-called purified protein derivatives which are routinely used for skin tests. Preliminary experiments indicate the presence of antibodies against the 64-kDa antigen in sera from tuberculosis patients.

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These references are in PubMed. This may not be the complete list of references from this article.

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