4C47

Salmonella enterica trimeric lipoprotein SadB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.448 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A Trimeric Lipoprotein Assists in Trimeric Autotransporter Biogenesis in Enterobacteria.

Grin, I.Hartmann, M.D.Sauer, G.Hernandez Alvarez, B.Schutz, M.Madlung, J.Macek, B.Felipe-Lopez, A.Hensel, M.Lupas, A.Linke, D.

(2014) J.Biol.Chem. 289: 7388

  • DOI: 10.1074/jbc.M113.513275

  • PubMed Abstract: 
  • Trimeric autotransporter adhesins (TAAs) are important virulence factors of many Gram-negative bacterial pathogens. TAAs form fibrous, adhesive structures on the bacterial cell surface. Their N-terminal extracellular domains are exported through a C- ...

    Trimeric autotransporter adhesins (TAAs) are important virulence factors of many Gram-negative bacterial pathogens. TAAs form fibrous, adhesive structures on the bacterial cell surface. Their N-terminal extracellular domains are exported through a C-terminal membrane pore; the insertion of the pore domain into the bacterial outer membrane follows the rules of β-barrel transmembrane protein biogenesis and is dependent on the essential Bam complex. We have recently described the full fiber structure of SadA, a TAA of unknown function in Salmonella and other enterobacteria. In this work, we describe the structure and function of SadB, a small inner membrane lipoprotein. The sadB gene is located in an operon with sadA; orthologous operons are only found in enterobacteria, whereas other TAAs are not typically associated with lipoproteins. Strikingly, SadB is also a trimer, and its co-expression with SadA has a direct influence on SadA structural integrity. This is the first report of a specific export factor of a TAA, suggesting that at least in some cases TAA autotransport is assisted by additional periplasmic proteins.


    Organizational Affiliation

    From the Max Planck Institut für Entwicklungsbiologie, 72076 Tübingen.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INNER MEMBRANE LIPOPROTEIN
A, B, C
207Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: sadB
Find proteins for Q8ZL65 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  Q8ZL65
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.448 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.204 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 118.450α = 90.00
b = 118.450β = 90.00
c = 159.180γ = 120.00
Software Package:
Software NamePurpose
SHELXphasing
XDSdata scaling
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-08
    Type: Initial release
  • Version 1.1: 2014-01-15
    Type: Database references
  • Version 1.2: 2014-04-02
    Type: Database references