NMR structure of E. coli LpoB

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 750 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Outer-membrane lipoprotein LpoB spans the periplasm to stimulate the peptidoglycan synthase PBP1B.

Egan, A.J.Jean, N.L.Koumoutsi, A.Bougault, C.M.Biboy, J.Sassine, J.Solovyova, A.S.Breukink, E.Typas, A.Vollmer, W.Simorre, J.P.

(2014) Proc Natl Acad Sci U S A 111: 8197-8202

  • DOI: https://doi.org/10.1073/pnas.1400376111
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacteria surround their cytoplasmic membrane with an essential, stress-bearing peptidoglycan (PG) layer. Growing and dividing cells expand their PG layer by using membrane-anchored PG synthases, which are guided by dynamic cytoskeletal elements. In Escherichia coli, growth of the mainly single-layered PG is also regulated by outer membrane-anchored lipoproteins. The lipoprotein LpoB is required for the activation of penicillin-binding protein (PBP) 1B, which is a major, bifunctional PG synthase with glycan chain polymerizing (glycosyltransferase) and peptide cross-linking (transpeptidase) activities. Here, we report the structure of LpoB, determined by NMR spectroscopy, showing an N-terminal, 54-aa-long flexible stretch followed by a globular domain with similarity to the N-terminal domain of the prevalent periplasmic protein TolB. We have identified the interaction interface between the globular domain of LpoB and the noncatalytic UvrB domain 2 homolog domain of PBP1B and modeled the complex. Amino acid exchanges within this interface weaken the PBP1B-LpoB interaction, decrease the PBP1B stimulation in vitro, and impair its function in vivo. On the contrary, the N-terminal flexible stretch of LpoB is required to stimulate PBP1B in vivo, but is dispensable in vitro. This supports a model in which LpoB spans the periplasm to interact with PBP1B and stimulate PG synthesis.

  • Organizational Affiliation

    Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne NE2 4AX, United Kingdom;

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Penicillin-binding protein activator LpoB197Escherichia coli str. K-12 substr. DH10BMutation(s): 0 
Gene Names: ycfMlpoBECDH10B_1177
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 750 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-05-21
    Type: Initial release
  • Version 1.1: 2014-06-18
    Changes: Database references
  • Version 1.2: 2014-06-25
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Data collection, Database references, Other