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Components of bacterial chemosensory pathways which sense via transmembrane receptors have been shown to localize to the cell poles. Many species, however, have operons encoding multiple putative chemosensory pathways, some including putative cytoplasmic receptors. In-genome fusions to single or multiple genes encoding components of two chemosensory pathways in Rhodobacter sphaeroides, cheOp 2 and cheOp 3 , revealed that while sensory transducing proteins associated with transmembrane receptors and encoded on cheOp 2 were targeted to the cell poles, the proteins associated with putative cytoplasmic receptors and encoded on cheOp 3 were all targeted to a cytoplasmic cluster. No proteins were localized to both sites. These data show that bacteria target components of related pathways to different sites in the cell, presumably preventing direct cross-talk between the different pathways, but allowing a balanced response between extracellular and cytoplasmic signals. It also indicates that there is intracellular organization in bacterial cells, with specific proteins targeted and localized to cytoplasmic regions.

Original publication

DOI

10.1046/j.1365-2958.2003.03716.x

Type

Journal article

Journal

Molecular Microbiology

Publication Date

01/11/2003

Volume

50

Pages

763 - 770