The trehalose-phosphate synthase (TPS) ofMycobacterium smegmatiswas previously purified to apparent homogeneity and several peptides from the 58 kDa protein were sequenced. Basedon that sequence information, the gene for TPSwasidentified inthe Mycobacterium tuberculosis genome, and the gene was cloned and expressed inEscheri-chia coliwith a (His)6tag at the amino terminus.