Lipoprotein DolP supports proper folding of BamA in the bacterial outer membrane promoting fitness upon envelope stress.
In Proteobacteria, integral outer membrane proteins (OMPs) are crucial for the maintenance of the envelope permeability barrier to some antibiotics and detergents. In Enterobacteria, envelope stress caused by unfolded OMPs activates the sigmaE (σE) transcriptional response. σE upregulates OMP biogenesis factors, including the β-barrel assembly machinery (BAM) that catalyses OMP folding. Here we report that DolP (formerly YraP), a σE-upregulated and poorly understood outer membrane lipoprotein, is crucial for fitness in cells that undergo envelope stress. We demonstrate that DolP interacts with the BAM complex by associating with outer membrane-assembled BamA. We provide evidence that DolP is important for proper folding of BamA that overaccumulates in the outer membrane, thus supporting OMP biogenesis and envelope integrity. Notably, mid-cell recruitment of DolP had been linked to regulation of septal peptidoglycan remodelling by an unknown mechanism. We now reveal that, during envelope stress, DolP loses its association with the mid-cell, thereby suggesting a mechanistic link between envelope stress caused by impaired OMP biogenesis and the regulation of a late step of cell division.
['Ranava|David|D|0000-0002-5841-7699', 'Yang|Yiying|Y|', 'Orenday-Tapia|Luis|L|0000-0002-1134-0823', 'Rousset|François|F|', 'Turlan|Catherine|C|', 'Morales|Violette|V|', 'Cui|Lun|L|', 'Moulin|Cyril|C|', 'Froment|Carine|C|', 'Munoz|Gladys|G|', 'Rech|Jérôme|J|', 'Marcoux|Julien|J|0000-0001-7321-7436', 'Caumont-Sarcos|Anne|A|', 'Albenne|Cécile|C|', 'Bikard|David|D|0000-0002-5729-1211', 'Ieva|Raffaele|R|0000-0002-3405-0650']
D000080943:Bacterial Outer Membrane D001425:Bacterial Outer Membrane Proteins D004926:Escherichia coli D029968:Escherichia coli Proteins D056084:Genetic Fitness D008074:Lipoproteins D017510:Protein Folding
DolP Envelope stress OMPs BAM YraP E. coli Outer membrane biogenesis infectious disease microbiology