Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 33500.74 
• Atom Count: 2352 
• Residue Count: 309 
• Unique protein chains: 1

1GCG

THE 1.9 ANGSTROMS X-RAY STRUCTURE OF A CLOSED UNLIGANDED FORM OF THE PERIPLASMIC GLUCOSE(SLASH)GALACTOSE RECEPTOR FROM SALMONELLA TYPHIMURIUM

• DOI: 10.2210/pdb1GCG/pdb

• Classification: GALACTOSE-BINDING PROTEIN
• Organism(s): Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)


• Deposited: 1994-02-03 Released: 1994-05-31 
• Deposition Author(s): Flocco, M.M., Mowbray, S.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Work: 0.179 

Literature

The 1.9 A x-ray structure of a closed unliganded form of the periplasmic glucose/galactose receptor from Salmonella typhimurium.

Flocco, M.M., Mowbray, S.L.

(1994) J.Biol.Chem. 269: 8931-8936

• PubMed: 8132630 


• PubMed Abstract: 
  

The three-dimensional structure of a ligand-free closed form of the glucose/galactose binding protein from Salmonella typhimurium has been determined at a resolution of 1.9 A. The crystallographic R-factor for the refined structure is 17.9%. The model contains all the atoms of the 309 residues of the protein sequence, a calcium ion, and 174 water molecules. The root mean square (r.m.s.) deviations for the whole molecule are: 0.010 A for bond lengths and 2.44 degrees for bond angles, indicating a good stereochemistry for the model. This structure shows that the protein is able to close in the absence of ligand, adopting a conformation similar to the liganded form but slightly more open. Water molecules satisfy the hydrogen bonding ability of the hydrophilic side chains of the binding site in a manner which is reminiscent of the sugars' hydrogen-bonding patterns. Since packing forces are weak, the crystallization event is unlikely to trigger a change from an open to a closed conformation. Instead, the latter must be one of the species in equilibrium in solution which is selected by packing in the crystal lattice.

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Related Citations: 

• The 1.7 Angstroms Refined X-Ray Structure of the Periplasmic Glucose(Slash)Galactose Receptor from Salmonella Typhimurium
  Zou, J.-Y.,Flocco, M.M.,Mowbray, S.L.
  (1993) J.Mol.Biol. 233: 739
• Structure of the Periplasmic Glucose(Slash)Galactose Receptor of Salmonella Typhimurium
  Mowbray, S.L.,Smith, R.D.,Cole, L.B.
  (1990) Receptor 1: 41
• Preliminary X-Ray Data for the Galactose Binding Protein from Salmonella Typhimurium
  Alber, T.,Fahnestock, M.,Mowbray, S.L.,Petsko, G.A.
  (1981) J.Mol.Biol. 147: 471
• Ribose and Glucose-Galactose Receptors Competitors in Bacterial Chemotaxis
  Mowbray, S.L.
  (1992) J.Mol.Biol. 227: 418




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Organizational Affiliation: 

Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala Biomedical Center.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GALACTOSE/GLUCOSE-BINDING PROTEIN	A	309	Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)	Mutation(s): 0  Gene Names: mglB
Find proteins for P23905 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Go to UniProtKB:  P23905

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Work: 0.179 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 120.140	α = 90.00
b = 37.020	β = 123.90
c = 80.630	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	phasing
X-PLOR	refinement
X-PLOR	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1994-02-03 
• Released Date: 1994-05-31 
• Deposition Author(s): Flocco, M.M., Mowbray, S.L.

Revision History 

• Version 1.0: 1994-05-31
  Type: Initial release
• Version 1.1: 2008-03-03
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-11-29
  Type: Derived calculations, Other