Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 42.57 kDa 
• Atom Count: 3435 
• Residue Count: 379 
• Unique protein chains: 1

5OJH

Crystal structure of the extramembrane domain of the cellulose biosynthetic protein BcsG from Salmonella typhimurium

• DOI: 10.2210/pdb5OJH/pdb

• Classification: TRANSFERASE
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium str. LT2
• Expression System: Escherichia coli DH5[alpha]
• Mutation(s): No 


• Deposited: 2017-07-21 Released: 2018-08-08 
• Deposition Author(s): Schneider, G., Vella, P., Lindqvist, Y., Schnell, R.
• Funding Organization(s): Swedish Research Council

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.198 
• R-Value Work: 0.166 
• R-Value Observed: 0.167 

Literature

Structural and Functional Characterization of the BcsG Subunit of the Cellulose Synthase in Salmonella typhimurium.

Sun, L., Vella, P., Schnell, R., Polyakova, A., Bourenkov, G., Li, F., Cimdins, A., Schneider, T.R., Lindqvist, Y., Galperin, M.Y., Schneider, G., Romling, U.

(2018) J Mol Biol 430: 3170-3189

• PubMed: 30017920 
• DOI: 10.1016/j.jmb.2018.07.008
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Many bacteria secrete cellulose, which forms the structural basis for bacterial multicellular aggregates, termed biofilms. The cellulose synthase complex of Salmonella typhimurium consists of the catalytic subunits BcsA and BcsB and several auxiliary subunits that are encoded by two divergently transcribed operons, bcsRQABZC and bcsEFG. Expression of the bcsEFG operon is required for full-scale cellulose production, but the functions of its products are not fully understood. This work aimed to characterize the BcsG subunit of the cellulose synthase, which consists of an N-terminal transmembrane fragment and a C-terminal domain in the periplasm. Deletion of the bcsG gene substantially decreased the total amount of BcsA and cellulose production. BcsA levels were partially restored by the expression of the transmembrane segment, whereas restoration of cellulose production required the presence of the C-terminal periplasmic domain and its characteristic metal-binding residues. The high-resolution crystal structure of the periplasmic domain characterized BcsG as a member of the alkaline phosphatase/sulfatase superfamily of metalloenzymes, containing a conserved Zn ²⁺ -binding site. Sequence and structural comparisons showed that BcsG belongs to a specific family within alkaline phosphatase-like enzymes, which includes bacterial Zn ²⁺ -dependent lipopolysaccharide phosphoethanolamine transferases such as MCR-1 (colistin resistance protein), EptA, and EptC and the Mn ²⁺ -dependent lipoteichoic acid synthase (phosphoglycerol transferase) LtaS. These enzymes use the phospholipids phosphatidylethanolamine and phosphatidylglycerol, respectively, as substrates. These data are consistent with the recently discovered phosphoethanolamine modification of cellulose by BcsG and show that its membrane-bound and periplasmic parts play distinct roles in the assembly of the functional cellulose synthase and cellulose production.

---

Organizational Affiliation: 

Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, S-171 77 Stockholm, Sweden. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Cellulose biosynthesis protein BcsG	A	383	Salmonella enterica subsp. enterica serovar Typhimurium str. LT2	Mutation(s): 0  Gene Names: bcsG, STM3624
Find proteins for Q7CPI7 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Go to UniProtKB:  Q7CPI7

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FLC	A	CITRATE ANION C6 H5 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-K
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.198 
• R-Value Work: 0.166 
• R-Value Observed: 0.167 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 80.444	α = 90
b = 80.444	β = 90
c = 97.529	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-07-21 
• Released Date: 2018-08-08 
Deposition Author(s): Schneider, G., Vella, P., Lindqvist, Y., Schnell, R.

---

Funding Organization	Location	Grant Number
Swedish Research Council	Sweden	--

Revision History 

• Version 1.0: 2018-08-08
  Type: Initial release
  
• Version 1.1: 2019-02-20
  Changes: Data collection, Database references