1ONW

Crystal structure of Isoaspartyl Dipeptidase from E. coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

High Resolution X-ray Structure of Isoaspartyl Dipeptidase from Escherichia coli

Thoden, J.B.Marti-Arbona, R.Raushel, F.M.Holden, H.M.

(2003) Biochemistry 42: 4874-4882

  • DOI: 10.1021/bi034233p
  • Primary Citation of Related Structures:  1ONX

  • PubMed Abstract: 
  • Isoaspartyl dipeptidase from Escherichia coli functions in protein degradation by catalyzing the hydrolysis of beta-L-isoaspartyl linkages in dipeptides. The best substrate for the enzyme reported thus far is iso-Asp-Leu. Here we report the X-ray ana ...

    Isoaspartyl dipeptidase from Escherichia coli functions in protein degradation by catalyzing the hydrolysis of beta-L-isoaspartyl linkages in dipeptides. The best substrate for the enzyme reported thus far is iso-Asp-Leu. Here we report the X-ray analysis of the enzyme in its resting state and complexed with aspartate to 1.65 and 2.1 A resolution, respectively. The quaternary structure of the enzyme is octameric and can be aptly described as a tetramer of dimers. Each subunit folds into two distinct domains: the N-terminal region containing eight strands of mixed beta-sheet and the C-terminal motif that is dominated by a (beta,alpha)(8)-barrel. A binuclear zinc center is located in each subunit at the C-terminal end of the (beta,alpha)(8)-barrel. Ligands to the binuclear metal center include His 68, His 70, His 201, His 230, and Asp 285. The two zincs are bridged by a carboxylated lysine residue (Lys 162) and a solvent molecule, most likely a hydroxide ion. The product of the reaction, aspartate, binds to the enzyme by displacing the bridging solvent with its side chain functional group. From this investigation it is proposed that the reaction mechanism of the enzyme proceeds through a tetrahedral intermediate and that the bridging solvent attacks the re face of the carbonyl carbon of the scissile peptide bond. This structural analysis confirms the placement of isoaspartyl dipeptidase into the urease-related amidohydrolase superfamily.


    Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Isoaspartyl dipeptidase
A, B
390Escherichia coli (strain K12)Gene Names: iadA (yjiF)
EC: 3.4.19.-
Find proteins for P39377 (Escherichia coli (strain K12))
Go to UniProtKB:  P39377
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

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A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
KCX
Query on KCX
A, B
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.178 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 116.700α = 90.00
b = 116.700β = 90.00
c = 138.500γ = 90.00
Software Package:
Software NamePurpose
SAINTdata reduction
SOLVEphasing
FRAMBOdata collection
TNTrefinement
SAINTdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-06
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2011-11-16
    Type: Atomic model
  • Version 1.4: 2017-10-11
    Type: Refinement description