Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 30.95 kDa 
• Atom Count: 2084 
• Residue Count: 254 
• Unique protein chains: 1

1FX8

CRYSTAL STRUCTURE OF THE E. COLI GLYCEROL FACILITATOR (GLPF) WITH SUBSTRATE GLYCEROL

• DOI: 10.2210/pdb1FX8/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-09-25 Released: 2000-11-01 
• Deposition Author(s): Fu, D., Libson, A., Miercke, L.J.W., Weitzman, C., Nollert, P., Stroud, R.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.223 
• R-Value Work: 0.197 
• R-Value Observed: 0.197 

Literature

Structure of a glycerol-conducting channel and the basis for its selectivity.

Fu, D., Libson, A., Miercke, L.J., Weitzman, C., Nollert, P., Krucinski, J., Stroud, R.M.

(2000) Science 290: 481-486

• PubMed: 11039922 
• DOI: 10.1126/science.290.5491.481
• Primary Citation of Related Structures:  
  1FX8


• PubMed Abstract: 
  

Membrane channel proteins of the aquaporin family are highly selective for permeation of specific small molecules, with absolute exclusion of ions and charged solutes and without dissipation of the electrochemical potential across the cell membrane. We report the crystal structure of the Escherichia coli glycerol facilitator (GlpF) with its primary permeant substrate glycerol at 2.2 angstrom resolution. Glycerol molecules line up in an amphipathic channel in single file. In the narrow selectivity filter of the channel the glycerol alkyl backbone is wedged against a hydrophobic corner, and successive hydroxyl groups form hydrogen bonds with a pair of acceptor, and donor atoms. Two conserved aspartic acid-proline-alanine motifs form a key interface between two gene-duplicated segments that each encode three-and-one-half membrane-spanning helices around the channel. This structure elucidates the mechanism of selective permeability for linear carbohydrates and suggests how ions and water are excluded.

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Organizational Affiliation: 

Department of Biochemistry and Biophysics, School of Medicine, University of California, San Francisco, CA 94143-0448, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GLYCEROL UPTAKE FACILITATOR PROTEIN	A	281	Escherichia coli	Mutation(s): 0
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  Channels: Aquaporins and Glyceroporins	Protein:  GlpF glycerol facilitator channel
Find proteins for P0AER0 (Escherichia coli (strain K12)) Explore P0AER0  Go to UniProtKB:  P0AER0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BOG	A	octyl beta-D-glucopyranoside C14 H28 O6 HEGSGKPQLMEBJL-RKQHYHRCSA-N
GOL	A	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.223 
• R-Value Work: 0.197 
• R-Value Observed: 0.197 
• Space Group: I 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 96.76	α = 90
b = 96.76	β = 90
c = 184.322	γ = 90

Software Package:

Software Name	Purpose
SHARP	phasing
CNS	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-09-25 
• Released Date: 2000-11-01 
Deposition Author(s): Fu, D., Libson, A., Miercke, L.J.W., Weitzman, C., Nollert, P., Stroud, R.M.

Revision History 

• Version 1.0: 2000-11-01
  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
• Version 1.3: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary