Major outer membrane prolipoprotein Lpp - P69776 (LPP_ECOLI)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P69776: 8
 
Function
An outer membrane lipoprotein that controls the distance between the inner and outer membranes; adding residues to Lpp increases the width of the periplasm (PubMed:29257832). The only protein known to be covalently linked to the peptidoglycan network (PGN) (PubMed:4261992, PubMed:3013869, PubMed:4245367). Also non-covalently binds the PGN (PubMed:3013869). The link between the cell outer membrane and PGN contributes to the maintenance of the structural and functional integrity of the cell envelope, and maintains the correct distance between the PGN and the outer membrane (PubMed:4261992, PubMed:3013869, PubMed:4245367, PubMed:4565677). The most adundant cellular protein, there can be up to 10(6) Lpp molecules per cell (PubMed:24766808). About one-third of Lpp is bound to the PGN (called bound or periplasmic) the rest is called free or transmembrane (PubMed:4565677). The 'free' form can be surface labeled by membrane impermeable agents and so must cross the outer membrane; it is thought that this transmembrane form is still anchored in the inner leaflet of the outer membrane (PubMed:21219470). Modeling suggests that non-covalent binding of OmpA (from the outer membrane) and TolR (from the inner membrane) to peptidoglycan maintains the position of the cell wall in the periplasm, holding it approximately equidistant from both the inner and outer membranes. Trimeric Lpp controls the width of the periplasm, adjusts its tilt angle to accommodate to the available space, and can compensate in part for an absence of OmpA (Probable). The role of the cell surface-exposed, free form (transmembrane) of Lpp is unknown (PubMed:21219470). UniProt
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Subunit Structure
Homotrimer (PubMed:3013869, PubMed:10843861). Interacts with OmpA (PubMed:3013869). Has been isolated from outer membrane preparations as an approximately 87 kDa complex, suggesting it also forms larger complexes (PubMed:16079137). Seems to interact with TolB, Pal and TonB (PubMed:9701827). UniProt
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  • Blue: probably ordered region.
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  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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