Types | DnaRegion
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Roles | CDS
Coding
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Sequences | BBa_K257017_sequence (Version 1)
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Description
The fec transduction pathway is unique because it allows a signal to be passed from the extracellular milieu down to the cytoplasm, thus being transmitted through both the outer and inner membrane. Briefly, the outermembrane protein FecA binds ferric citrate, change its conformation to interact with FecR which is an transmembrane protein located in the inner membrane. Then FecR is able to activate FecI an alternative sigma factor specific to Pfec.
In some variant of the system, the activated FecR homologues would repress FecI activity instead of activating it.
Notes
Fec I needs to be expressed in association with Fec R behind the Pfec promoter in order to have a functional transduction pathway.
Source
For more information, see: Gene regulation by transmembrane signaling. Volkmar Braun et al., 2006