4RLA

ALTERING THE BINUCLEAR MANGANESE CLUSTER OF ARGINASE DIMINISHES THERMOSTABILITY AND CATALYTIC FUNCTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.94 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Altering the binuclear manganese cluster of arginase diminishes thermostability and catalytic function.

Scolnick, L.R.Kanyo, Z.F.Cavalli, R.C.Ash, D.E.Christianson, D.W.

(1997) Biochemistry 36: 10558-10565

  • DOI: 10.1021/bi970800v
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Arginase is a thermostable (Tm = 75 degrees C) binuclear manganese metalloenzyme which hydrolyzes l-arginine to form l-ornithine and urea. The three-dimensional structures of native metal-depleted arginase, metal-loaded H101N arginase, and metal-depl ...

    Arginase is a thermostable (Tm = 75 degrees C) binuclear manganese metalloenzyme which hydrolyzes l-arginine to form l-ornithine and urea. The three-dimensional structures of native metal-depleted arginase, metal-loaded H101N arginase, and metal-depleted H101N arginase have been determined by X-ray crystallographic methods to probe the roles of the manganese ion in site A (Mn2+A) and its ligand H101 in catalysis and thermostability. We correlate these structures with thermal stability and catalytic activity measurements reported here and elsewhere [Cavalli, R. C., Burke, C. J., Kawamoto, S., Soprano, D. R., and Ash, D. E. (1994) Biochemistry 33, 10652-10657]. We conclude that the substitution of a wild-type histidine ligand to Mn2+A compromises metal binding, which in turn compromises protein thermostability and catalytic function. Therefore, a fully occupied binuclear manganese metal cluster is required for optimal catalysis and thermostability.


    Organizational Affiliation

    Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ARGINASE
A, B, C
323Rattus norvegicusMutation(s): 1 
Gene Names: PARGR-2Arg1
EC: 3.5.3.1
Find proteins for P07824 (Rattus norvegicus)
Go to UniProtKB:  P07824
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download CCD File 
A, B, C
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.94 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89α = 90
b = 89β = 90
c = 115.1γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
MOSFLMdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-05-13
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance