1EQ7

CORE STRUCTURE OF THE OUTER MEMBRANE LIPOPROTEIN FROM ESCHERICHIA COLI AT 1.9 ANGSTROM RESOLUTION

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

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This is version 1.2 of the entry. See complete history. 


Literature

Core structure of the outer membrane lipoprotein from Escherichia coli at 1.9 A resolution.

Shu, W., Liu, J., Ji, H., Lu, M.

(2000) J Mol Biol 299: 1101-1112

  • DOI: 10.1006/jmbi.2000.3776
  • Primary Citation of Related Structures:  
    1EQ7

  • PubMed Abstract: 

    • The outer membrane lipoprotein of the Escherichia coli cell envelope has characteristic lipid modifications at an amino-terminal cysteine and can exist in a form bound covalently to the peptidoglycan through a carboxyl-terminal lysine. The 56-residue polypeptide moiety of the lipoprotein, designated Lpp-56, folds into a stable, trimeric helical structure in aqueous solution ...

    The outer membrane lipoprotein of the Escherichia coli cell envelope has characteristic lipid modifications at an amino-terminal cysteine and can exist in a form bound covalently to the peptidoglycan through a carboxyl-terminal lysine. The 56-residue polypeptide moiety of the lipoprotein, designated Lpp-56, folds into a stable, trimeric helical structure in aqueous solution. The 1.9 A resolution crystal structure of Lpp-56 comprises a parallel three-stranded coiled coil including a novel alanine-zipper unit and two helix-capping motifs. The amino-terminal motif forms a hydrogen-bonding network anchoring an umbrella-shaped fold. The carboxyl-terminal motif uses puckering of the tyrosine side-chains as a unique docking arrangement in helix termination. The structure provides an explanation for assembly and insertion of the lipoprotein molecules into the outer membrane of gram-negative bacteria and suggests a molecular target for antibacterial drug discovery.

    Organizational Affiliation: 

    Department of Biochemistry, Weill Medical College of Cornell University, New York, NY, 10021, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OUTER MEMBRANE LIPOPROTEINA56Escherichia coliMutation(s): 0 
UniProt
Find proteins for P69776 (Escherichia coli (strain K12))
Explore P69776 
Go to UniProtKB:  P69776
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69776
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.363α = 90
b = 34.363β = 90
c = 194.135γ = 120
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-06-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance