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Lipoproteins: Structure, Function, Biosynthesis

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Bacterial Cell Walls and Membranes

Part of the book series: Subcellular Biochemistry ((SCBI,volume 92))

Abstract

The Lpp lipoprotein of Escherichia coli is the first identified protein with a covalently linked lipid. It is chemically bound by its C-terminus to murein (peptidoglycan) and inserts by the lipid at the N-terminus into the outer membrane. As the most abundant protein in E. coli (106 molecules per cell) it plays an important role for the integrity of the cell envelope. Lpp represents the type protein of a large variety of lipoproteins found in Gram-negative and Gram-positive bacteria and in archaea that have in common the lipid structure for anchoring the proteins to membranes but otherwise strongly vary in sequence, structure, and function. Predicted lipoproteins in known prokaryotic genomes comprise 2.7% of all proteins. Lipoproteins are modified by a unique phospholipid pathway and transferred from the cytoplasmic membrane into the outer membrane by a special system. They are involved in protein incorporation into the outer membrane, protein secretion across the cytoplasmic membrane, periplasm and outer membrane, signal transduction, conjugation, cell wall metabolism, antibiotic resistance, biofilm formation, and adhesion to host tissues. They are only found in bacteria and function as signal molecules for the innate immune system of vertebrates, where they cause inflammation and elicit innate and adaptive immune response through Toll-like receptors. This review discusses various aspects of Lpp and other lipoproteins of Gram-negative and Gram-positive bacteria and archaea.

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Acknowledgements

The authors work was supported by institutional funds of the Max Planck Society (V.B.) and the German Science Foundation (V.B., K.H.). We thank Jens Baßler for his lipoprotein sequence analysis. V.B. thanks Andrei Lupas for his generous hospitality in his Department of Protein Evolution in the Max Planck Institute for Developmental Biology. K.H. thanks Karl Forchhammer and Joachim E. Schultz for generous hospitality.

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Correspondence to Volkmar Braun .

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Braun, V., Hantke, K. (2019). Lipoproteins: Structure, Function, Biosynthesis. In: Kuhn, A. (eds) Bacterial Cell Walls and Membranes . Subcellular Biochemistry, vol 92. Springer, Cham. https://doi.org/10.1007/978-3-030-18768-2_3

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