Abstract
The genes of ESAT-6, CFP-10 and Ag85A secreted antigens of Mycobacterium tuberculosis were cloned in Escherichia coli. Fusion proteins Esat6-CBD, Ag85A-CBD and CFP10-CBD with thermostable cellulose binding domain (CBD) of Anaerocellum thermophilum providing high affinity to cellulose were constructed. Content of the fused proteins in overproducing strains was 20% of total protein for CFP10-CBD and 15% for both Esat6-CBD and Ag85A-CBD. Immobilization of the fusion proteins on cellulose is a one-stage process that provides simultaneous antigen purification and absorption on cellulose. The proteins retain their antigenic properties and can be used as the components for subunit tuberculosis vaccine production or in diagnostic kits.
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