Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 71.20 kDa 
• Atom Count: 4527 
• Residue Count: 568 
• Unique protein chains: 1

4C47

Salmonella enterica trimeric lipoprotein SadB

• DOI: 10.2210/pdb4C47/pdb

• Classification: CELL ADHESION
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium str. LT2
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-09-02 Released: 2014-01-08 
• Deposition Author(s): Grin, I., Linke, D., Hartmann, M.D.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.242 
• R-Value Work: 0.204 
• R-Value Observed: 0.206 

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

• PubMed: 24369174 
• DOI: 10.1074/jbc.M113.513275
• Primary Citation of Related Structures:  
  4C47


• 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-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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INNER MEMBRANE LIPOPROTEIN	A, B, C	207	Salmonella enterica subsp. enterica serovar Typhimurium str. LT2	Mutation(s): 0  Gene Names: sadB, STM3690
Find proteins for Q8ZL65 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore Q8ZL65  Go to UniProtKB:  Q8ZL65

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.242 
• R-Value Work: 0.204 
• R-Value Observed: 0.206 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 118.45	α = 90
b = 118.45	β = 90
c = 159.18	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XDS	data scaling
SHELX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-09-02 
• Released Date: 2014-01-08 
Deposition Author(s): Grin, I., Linke, D., Hartmann, M.D.

Revision History 

• Version 1.0: 2014-01-08
  Type: Initial release
  
• Version 1.1: 2014-01-15
  Changes: Database references
• Version 1.2: 2014-04-02
  Changes: Database references
• Version 1.3: 2019-05-08
  Changes: Data collection, Experimental preparation, Other