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Diagram of the physiological role of AlgU and LptG. a, Environmental stressors activate AlgW to cleave and release MucB. The loss of MucB activates MucP to cleave MucA and release the sigma factor AlgU into the cytosol, allowing transcription of alginate biosynthesis products. b, LPS is transported to the outer leaflet of the inner membrane by MsbA before being transferred to the LptB2FG complex. LPS is then shuttled to LptDE in the outer membrane through LptC and LptA
