3RHY

Crystal structure of the dimethylarginine dimethylaminohydrolase adduct with 4-chloro-2-hydroxymethylpyridine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

On the mechanism of dimethylarginine dimethylaminohydrolase inactivation by 4-halopyridines.

Johnson, C.M.Monzingo, A.F.Ke, Z.Yoon, D.W.Linsky, T.W.Guo, H.Robertus, J.D.Fast, W.

(2011) J.Am.Chem.Soc. 133: 10951-10959

  • DOI: 10.1021/ja2033684

  • PubMed Abstract: 
  • Small molecules capable of selective covalent protein modification are of significant interest for the development of biological probes and therapeutics. We recently reported that 2-methyl-4-bromopyridine is a quiescent affinity label for the nitric ...

    Small molecules capable of selective covalent protein modification are of significant interest for the development of biological probes and therapeutics. We recently reported that 2-methyl-4-bromopyridine is a quiescent affinity label for the nitric oxide controlling enzyme dimethylarginine dimethylaminohydrolase (DDAH) (Johnson, C. M.; Linsky, T. W.; Yoon, D. W.; Person, M. D.; Fast, W. J. Am. Chem. Soc. 2011, 133, 1553-1562). Discovery of this novel protein modifier raised the possibility that the 4-halopyridine motif may be suitable for wider application. Therefore, the inactivation mechanism of the related compound 2-hydroxymethyl-4-chloropyridine is probed here in more detail. Solution studies support an inactivation mechanism in which the active site Asp66 residue stabilizes the pyridinium form of the inactivator, which has enhanced reactivity toward the active site Cys, resulting in covalent bond formation, loss of the halide, and irreversible inactivation. A 2.18 Å resolution X-ray crystal structure of the inactivated complex elucidates the orientation of the inactivator and its covalent attachment to the active site Cys, but the structural model does not show an interaction between the inactivator and Asp66. Molecular modeling is used to investigate inactivator binding, reaction, and also a final pyridinium deprotonation step that accounts for the apparent differences between the solution-based and structural studies with respect to the role of Asp66. This work integrates multiple approaches to elucidate the inactivation mechanism of a novel 4-halopyridine "warhead," emphasizing the strategy of using pyridinium formation as a "switch" to enhance reactivity when bound to the target protein.


    Organizational Affiliation

    Division of Medicinal Chemistry, College of Pharmacy, University of Texas, Austin, Texas 78712, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
N(G),N(G)-dimethylarginine dimethylaminohydrolase
A, B
254Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)Mutation(s): 0 
EC: 3.5.3.18
Find proteins for Q9I4E3 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  Q9I4E3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HM3
Query on HM3

Download SDF File 
Download CCD File 
A, B
(4-chloropyridin-2-yl)methanol
4-chloro-2-hydroxymethylpyridine
C6 H6 Cl N O
UEAIOHHGRGSGGJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.209 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 45.800α = 90.00
b = 73.280β = 90.00
c = 149.530γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
StructureStudiodata collection
MOLREPphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-06-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-07-27
    Type: Database references