Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 85071.34 
• Atom Count: 5781 
• Residue Count: 784 
• Unique protein chains: 1

2BL4

Lactaldehyde:1,2-propanediol oxidoreductase of Escherichia coli

• DOI: 10.2210/pdb2BL4/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli


• Deposited: 2005-03-01 Released: 2005-07-06 
• Deposition Author(s): Montella, C., Bellsolell, L., Perez-Luque, R., Badia, J., Baldoma, L., Coll, M., Aguilar, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.303 
• R-Value Work: 0.251 

Literature

Crystal Structure of an Iron-Dependent Group III Dehydrogenase that Interconverts L-Lactaldehyde and L-1,2-Propanediol in Escherichia Coli.

Montella, C., Bellsolell, L., Perez-Luque, R., Badia, J., Baldoma, L., Coll, M., Aguilar, J.

(2005) J.Bacteriol. 187: 4957

• PubMed: 15995211 
• DOI: 10.1128/JB.187.14.4957-4966.2005
• Primary Citation of Related Structures:  
  2BI4


• PubMed Abstract: 
  

The FucO protein, a member of the group III "iron-activated" dehydrogenases, catalyzes the interconversion between L-lactaldehyde and L-1,2-propanediol in Escherichia coli. The three-dimensional structure of FucO in a complex with NAD(+) was solved, and the presence of iron in the crystals was confirmed by X-ray fluorescence. The FucO structure presented here is the first structure for a member of the group III bacterial dehydrogenases shown experimentally to contain iron. FucO forms a dimer, in which each monomer folds into an alpha/beta dinucleotide-binding N-terminal domain and an all-alpha-helix C-terminal domain that are separated by a deep cleft. The dimer is formed by the swapping (between monomers) of the first chain of the beta-sheet. The binding site for Fe(2+) is located at the face of the cleft formed by the C-terminal domain, where the metal ion is tetrahedrally coordinated by three histidine residues (His200, His263, and His277) and an aspartate residue (Asp196). The glycine-rich turn formed by residues 96 to 98 and the following alpha-helix is part of the NAD(+) recognition locus common in dehydrogenases. Site-directed mutagenesis and enzyme kinetic assays were performed to assess the role of different residues in metal, cofactor, and substrate binding. In contrast to previous assumptions, the essential His267 residue does not interact with the metal ion. Asp39 appears to be the key residue for discriminating against NADP(+). Modeling L-1,2-propanediol in the active center resulted in a close approach of the C-1 hydroxyl of the substrate to C-4 of the nicotinamide ring, implying that there is a typical metal-dependent dehydrogenation catalytic mechanism.

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Organizational Affiliation: 

Department of Biochemistry, School of Pharmacy, University of Barcelona, Spain.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
LACTALDEHYDE REDUCTASE	A, B	392	Escherichia coli (strain K12)	Mutation(s): 0  Gene Names: fucO EC: 1.1.1.77
Find proteins for P0A9S1 (Escherichia coli (strain K12)) Go to UniProtKB:  P0A9S1

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
NAD	A, B	NICOTINAMIDE-ADENINE-DINUCLEOTIDE C21 H27 N7 O14 P2 BAWFJGJZGIEFAR-NNYOXOHSSA-N
FE2	A, B	FE (II) ION Fe CWYNVVGOOAEACU-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.303 
• R-Value Work: 0.251 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 109.422	α = 90.00
b = 109.422	β = 90.00
c = 182.459	γ = 120.00

Software Package:

Software Name	Purpose
AMoRE	phasing
MOSFLM	data reduction
REFMAC	refinement
XDS	data scaling
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-03-01 
• Released Date: 2005-07-06 
• Deposition Author(s): Montella, C., Bellsolell, L., Perez-Luque, R., Badia, J., Baldoma, L., Coll, M., Aguilar, J.

Revision History 

• Version 1.0: 2005-07-06
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance