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The genes encoding xylose isomerase (xylA ) and xylulose kinase (xylB ) from the thermophilic anaerobeThermoanaerobacter ethanolicus were found to constitute an operon with the transcription initiation site 169 nucleotides upstream from the previously assigned (K. Dekker, H. Yamagata, K. Sakaguchi, and S. Udaka, Agric. Biol. Chem. 55:221–227, 1991) promoter region. The bicistronicxylAB mRNA was processed by cleavage within the 5′-terminal portion of the XylB-coding sequence. Transcription ofxylAB was induced in the presence of xylose, and, unlike in all other xylose-utilizing bacteria studied, was not repressed by glucose. The existence of putativexyl operator sequences suggested that xylose utilization is controlled by a repressor-operator mechanism. TheT. ethanolicus xylB gene coded for a 500-amino-acid-residue protein with a deduced amino acid sequence highly homologous to those of other XylBs. This is the first report of anxylB nucleotide sequence and anxylAB operon from a thermophilic anaerobic bacterium.

Cloning and Characterization of Transcription of the xylAB Operon in Thermoanaerobacter ethanolicus