lipopolysaccharide metabolic process / UDP-3-O-acyl-N-acetylglucosamine deacetylase / UDP-3-O-[3-hydroxymyristoyl] N-acetylglucosamine deacetylase activity / UDP-3-O-acyl-N-acetylglucosamine deacetylase activity / regulation of lipid biosynthetic process / lipid A biosynthetic process / cytoplasmic side of plasma membrane / iron ion binding / metal ion binding Similarity search - Function
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM137068
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
RM1GM149406
United States
Citation
Journal: Proc Natl Acad Sci U S A / Year: 2024 Title: Dual function of LapB (YciM) in regulating lipopolysaccharide synthesis. Authors: Sheng Shu / Yuko Tsutsui / Rajkanwar Nathawat / Wei Mi / Abstract: Levels of lipopolysaccharide (LPS), an essential glycolipid on the surface of most gram-negative bacteria, are tightly controlled-making LPS synthesis a promising target for developing new ...Levels of lipopolysaccharide (LPS), an essential glycolipid on the surface of most gram-negative bacteria, are tightly controlled-making LPS synthesis a promising target for developing new antibiotics. adaptor protein LapB (YciM) plays an important role in regulating LPS synthesis by promoting degradation of LpxC, a deacetylase that catalyzes the first committed step in LPS synthesis. Under conditions where LPS is abundant, LapB recruits LpxC to the AAA+ protease FtsH for degradation. LapB achieves this by simultaneously interacting with FtsH through its transmembrane helix and LpxC through its cytoplasmic domain. Here, we describe a cryo-EM structure of the complex formed between LpxC and the cytoplasmic domain of LapB (LapB). The structure reveals how LapB exploits both its tetratricopeptide repeat (TPR) motifs and rubredoxin domain to interact with LpxC. Through both in vitro and in vivo analysis, we show that mutations at the LapB/LpxC interface prevent LpxC degradation. Unexpectedly, binding to LapB also inhibits the enzymatic activity of LpxC through allosteric effects reminiscent of LpxC activation by MurA in Our findings argue that LapB regulates LPS synthesis in two steps: In the first step, LapB inhibits the activity of LpxC, and in the second step, it commits LpxC to degradation by FtsH.
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