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DNA binding assays as a function of cAMP concentration indicates that one cAMP molecule per homodimer dissociates high-order CRPMTB-DNA oligomers into 1-to-1 complexes. These cAMP-mediated allosteric effects are lost in the double mutant L47P/E178K from the attenuated M. bovis BCG strain (CRPBCG). The functional behavior, thermodynamic stability and dimerization constant of CRPBCG are not observed in the single mutants L47P or E178K, indicating long-range interactions between these two sites. Altogether, we provide a previously undescri