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Additional
CFTR inhibitory factor
English Wikipedia - The Free Encyclopedia
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CFTR inhibitory factor
The
CFTR inhibitory factor
(
Cif
) is a protein
virulence factor
secreted by the
Gram-negative bacteria
Pseudomonas aeruginosa
and
Acinetobacter nosocomialis
. Discovered at
Dartmouth Medical School
, Cif is able to alter the trafficking of select
ABC transporters
in eukaryotic
epithelial cells
, such as the
cystic fibrosis transmembrane conductance regulator
(CFTR), and
P-glycoprotein
by interfering with the host deubiquitinating machinery. By promoting the
ubiquitin
-mediated degradation of CFTR, Cif is able to phenocopy
cystic fibrosis
at the cellular level. The
cif
gene is transcribed as part of a 3 gene
operon
, whose expression is negatively regulated by CifR, a
TetR
family repressor.
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