Comprehensive Characterization of Operon Activation in .

Wildtype cells cannot grow on L-1,2-propanediol, as the operon within the fucose () regulon is thought to be silent in the absence of L-fucose. Little information is available concerning the transcriptional regulation of this operon. Here, we first confirm that operon expression is highly inducible by fucose and is primarily attributable to the upstream operon promoter, while the promoter within the 3'-end of is weak and uninducible.