3NZQ

Crystal Structure of Biosynthetic arginine decarboxylase ADC (SpeA) from Escherichia coli, Northeast Structural Genomics Consortium Target ER600


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structures of bacterial biosynthetic arginine decarboxylases.

Forouhar, F.Lew, S.Seetharaman, J.Xiao, R.Acton, T.B.Montelione, G.T.Tong, L.

(2010) Acta Crystallogr.,Sect.F 66: 1562-1566

  • DOI: 10.1107/S1744309110040649
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Biosynthetic arginine decarboxylase (ADC; also known as SpeA) plays an important role in the biosynthesis of polyamines from arginine in bacteria and plants. SpeA is a pyridoxal-5'-phosphate (PLP)-dependent enzyme and shares weak sequence homology wi ...

    Biosynthetic arginine decarboxylase (ADC; also known as SpeA) plays an important role in the biosynthesis of polyamines from arginine in bacteria and plants. SpeA is a pyridoxal-5'-phosphate (PLP)-dependent enzyme and shares weak sequence homology with several other PLP-dependent decarboxylases. Here, the crystal structure of PLP-bound SpeA from Campylobacter jejuni is reported at 3.0 Å resolution and that of Escherichia coli SpeA in complex with a sulfate ion is reported at 3.1 Å resolution. The structure of the SpeA monomer contains two large domains, an N-terminal TIM-barrel domain followed by a β-sandwich domain, as well as two smaller helical domains. The TIM-barrel and β-sandwich domains share structural homology with several other PLP-dependent decarboxylases, even though the sequence conservation among these enzymes is less than 25%. A similar tetramer is observed for both C. jejuni and E. coli SpeA, composed of two dimers of tightly associated monomers. The active site of SpeA is located at the interface of this dimer and is formed by residues from the TIM-barrel domain of one monomer and a highly conserved loop in the β-sandwich domain of the other monomer. The PLP cofactor is recognized by hydrogen-bonding, π-stacking and van der Waals interactions.


    Organizational Affiliation

    Northeast Structural Genomics Consortium, New York, NY 10027, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Biosynthetic arginine decarboxylase
A, B
666Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: speA
EC: 4.1.1.19
Find proteins for P21170 (Escherichia coli (strain K12))
Go to UniProtKB:  P21170
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.200 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 192.522α = 90.00
b = 192.522β = 90.00
c = 119.895γ = 90.00
Software Package:
Software NamePurpose
RESOLVEphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
SHELXphasing
CNSrefinement
ADSCdata collection
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2010-09-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-02-22
    Type: Structure summary