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RESEARCH PRODUCT
The Escherichia coli Envelope Stress Sensor CpxA Responds to Changes in Lipid Bilayer Properties
Nicole HansmeierÅKe WieslanderCandan AriözDaniel O. DaleySabine HunkeAmélie A. KellyFilippa Stenberg-bruzellRebecca KellerMalin BurstedtDavid Vikströmsubject
Models MolecularCardiolipinsSurface PropertiesRecombinant Fusion ProteinsGreen Fluorescent ProteinsLipid BilayersArabidopsisPhospholipidBiologymedicine.disease_causeBiochemistrychemistry.chemical_compoundBacterial ProteinsGenes ReportermedicineAcholeplasma laidlawiiPhosphorylationLipid bilayerEscherichia coliPlant ProteinsPhosphatidylethanolamineEscherichia coli ProteinsPhosphatidylethanolaminesVesicleGlycosyltransferasesMembrane ProteinsPhosphatidylglycerolsCell biologychemistryMembrane proteinlipids (amino acids peptides and proteins)Protein foldingSignal transductionProtein KinasesProtein Processing Post-TranslationalSignal Transductiondescription
The Cpx stress response system is induced by various environmental and cellular stimuli. It is also activated in Escherichia coli strains lacking the major phospholipid, phosphatidylethanolamine (PE). However, it is not known whether CpxA directly senses changes in the lipid bilayer or the presence of misfolded proteins due to the lack of PE in their membranes. To address this question, we used an in vitro reconstitution system and vesicles with different lipid compositions to track modulations in the activity of CpxA in different lipid bilayers. Moreover, the Cpx response was validated in vivo by monitoring expression of a PcpxP-gfp reporter in lipid-engineered strains of E. coli. Our combined data indicate that CpxA responds specifically to different lipid compositions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-05-21 | Biochemistry |