4ELS

Structure of E. Coli. 1,4-dihydroxy-2- naphthoyl coenzyme A synthases (MENB) in complex with bicarbonate

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.303 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.182 

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Literature

Active site binding and catalytic role of bicarbonate in 1,4-dihydroxy-2-naphthoyl coenzyme A synthases from vitamin K biosynthetic pathways

Sun, Y.R., Song, H.G., Li, J., Jiang, M., Li, Y., Zhou, J.H., Guo, Z.H.

(2012) Biochemistry 51: 4580-4589

  • DOI: 10.1021/bi300486j
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • 1,4-Dihydroxy-2-naphthoyl coenzyme A (DHNA-CoA) synthase, or MenB, catalyzes a carbon-carbon bond formation reaction in the biosynthesis of both vitamin K1 and K2. Bicarbonate is crucial to the activity of a large subset of its orthologues but lacks ...

    1,4-Dihydroxy-2-naphthoyl coenzyme A (DHNA-CoA) synthase, or MenB, catalyzes a carbon-carbon bond formation reaction in the biosynthesis of both vitamin K1 and K2. Bicarbonate is crucial to the activity of a large subset of its orthologues but lacks a clearly defined structural and mechanistic role. Here we determine the crystal structure of the holoenzymes from Escherichia coli at 2.30 Å and Synechocystis sp. PCC6803 at 2.04 Å, in which the bicarbonate cofactor is bound to the enzyme active site at a position equivalent to that of the side chain carboxylate of an aspartate residue conserved among bicarbonate-insensitive DHNA-CoA synthases. Binding of the planar anion involves both nonspecific electrostatic attraction and specific hydrogen bonding and hydrophobic interactions. In the absence of bicarbonate, the anion binding site is occupied by a chloride ion or nitrate, an inhibitor directly competing with bicarbonate. These results provide a solid structural basis for the bicarbonate dependence of the enzymatic activity of type I DHNA-CoA synthases. The unique location of the bicarbonate ion in relation to the expected position of the substrate α-proton in the enzyme's active site suggests a critical catalytic role for the anionic cofactor as a catalytic base in enolate formation.

    Organizational Affiliation: 

    Department of Chemistry and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
1,4-Dihydroxy-2-naphthoyl-CoA synthase
A, B, C, D, E, F
285Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: menB
EC: 4.1.3.36
Find proteins for P0ABU0 (Escherichia coli (strain K12))
Go to UniProtKB:  P0ABU0
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL
Download SDF File 
Download CCD File 
A, B, C, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL
Download SDF File 
Download CCD File 
A, B, C, F
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO
Download SDF File 
Download CCD File 
A, F
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
BCT
Query on BCT
Download SDF File 
Download CCD File 
A, B, C, D, E, F
BICARBONATE ION
C H O3
BVKZGUZCCUSVTD-UHFFFAOYSA-M
 Ligand Interaction
PEG
Query on PEG
Download SDF File 
Download CCD File 
F
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.303 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 76.367α = 90.00
b = 133.888β = 90.00
c = 153.250γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
HKL-2000data reduction
HKL-2000data scaling
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-06
    Type: Initial release
  • Version 1.1: 2013-07-03
    Type: Database references