1TA1

H141C mutant of rat liver arginase I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Probing the role of the hyper-reactive histidine residue of arginase.

Colleluori, D.M.Reczkowski, R.S.Emig, F.A.Cama, E.Cox, J.D.Scolnick, L.R.Compher, K.Jude, K.Han, S.Viola, R.E.Christianson, D.W.Ash, D.E.

(2005) Arch Biochem Biophys 444: 15-26

  • DOI: 10.1016/j.abb.2005.09.009
  • Primary Citation of Related Structures:  
    1ZPE, 1ZPG, 1TA1, 1TBL, 1TBJ, 1TBH

  • PubMed Abstract: 
  • Rat liver arginase (arginase I) is potently inactivated by diethyl pyrocarbonate, with a second-order rate constant of 113M(-1)s(-1) for the inactivation process at pH 7.0, 25 degrees C. Partial protection from inactivation is provided by the product of the reaction, l-ornithine, while nearly complete protection is afforded by the inhibitor pair, l-ornithine and borate ...

    Rat liver arginase (arginase I) is potently inactivated by diethyl pyrocarbonate, with a second-order rate constant of 113M(-1)s(-1) for the inactivation process at pH 7.0, 25 degrees C. Partial protection from inactivation is provided by the product of the reaction, l-ornithine, while nearly complete protection is afforded by the inhibitor pair, l-ornithine and borate. The role of H141 has been probed by mutagenesis, chemical modulation, and X-ray diffraction. The hyper-reactivity of H141 towards diethyl pyrocarbonate can be explained by its proximity to E277. A proton shuttling role for H141 is supported by its conformational mobility observed among the known arginase structures. H141 is proposed to serve as an acid/base catalyst, deprotonating the metal-bridging water molecule to generate the metal-bridging hydroxide nucleophile, and by protonating the amino group of the product to facilitate its departure.


    Organizational Affiliation

    Department of Biochemistry, Temple University School of Medicine, Philadelphia, PA 19140, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Arginase 1A, B, C314Rattus norvegicusMutation(s): 1 
Gene Names: Arg1
EC: 3.5.3.1
UniProt
Find proteins for P07824 (Rattus norvegicus)
Explore P07824 
Go to UniProtKB:  P07824
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.357α = 90
b = 87.357β = 90
c = 105.656γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-16
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance