The trehalose operon of Pseudomonas fluorescens ATCC 17400

The trehalose operon of Pseudomonas fluorescens ATCC 17400 consists of treP , treA and treR. The gene treP codes for a putative enzyme II subunit of th e phosphotransferase system that catalyzes the phosphorylation of trehalose together with its translocation across the cell membrane and treA encodes a putative phosphotrehalase, which hydrolyzes the incoming trehalose-6-phos phate into glucose and glucose-6-phosphate. Both genes are negatively regul ated by TreR, a repressor of the FadR-GntR family of transcription regulato rs. The operon that is induced by trehalose present in the medium shows a h igh similarity both in the function of genes and in the regulation with the trehalose operon of Bacillus subtilis. (C) 2000 Editions scientifiques et medicales Elsevier SAS.