4Q3P

Crystal structure of Schistosoma mansoni arginase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal Structure of Schistosoma mansoni Arginase, a Potential Drug Target for the Treatment of Schistosomiasis.

Hai, Y., Edwards, J.E., Van Zandt, M.C., Hoffmann, K.F., Christianson, D.W.

(2014) Biochemistry 53: 4671-4684

  • DOI: 10.1021/bi5004519
  • Primary Citation of Related Structures:  
    4Q3P, 4Q3Q, 4Q3R, 4Q3S, 4Q3T, 4Q3U, 4Q3V, 4Q40, 4Q41, 4Q42

  • PubMed Abstract: 

    • The X-ray crystal structure of arginase from Schistosoma mansoni (SmARG) and the structures of its complexes with several amino acid inhibitors have been determined at atomic resolution. SmARG is a binuclear manganese metalloenzyme that catalyzes the hydrolysis of l-arginine to form l-ornithine and urea, and this enzyme is upregulated in all forms of the parasite that interact with the human host ...

    The X-ray crystal structure of arginase from Schistosoma mansoni (SmARG) and the structures of its complexes with several amino acid inhibitors have been determined at atomic resolution. SmARG is a binuclear manganese metalloenzyme that catalyzes the hydrolysis of l-arginine to form l-ornithine and urea, and this enzyme is upregulated in all forms of the parasite that interact with the human host. Current hypotheses suggest that parasitic arginases could play a role in host immune evasion by depleting pools of substrate l-arginine that would otherwise be utilized for NO biosynthesis and NO-dependent processes in the immune response. Although the amino acid sequence of SmARG is only 42% identical with that of human arginase I, residues important for substrate binding and catalysis are strictly conserved. In general, classical amino acid inhibitors such as 2(S)-amino-6-boronohexanoic acid (ABH) tend to bind more weakly to SmARG than to human arginase I despite identical inhibitor binding modes in each enzyme active site. The identification of a patch on the enzyme surface capable of accommodating the additional Cα substitutent of an α,α-disubstituted amino acid inhibitor suggests that such inhibitors could exhibit higher affinity and biological activity. The structures of SmARG complexed with two different α,α-disubstituted derivatives of ABH are presented and provide a proof of concept for this approach in the enhancement of enzyme-inhibitor affinity.

    Organizational Affiliation: 

    Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104-6323, United States.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ArginaseA, B, C, D385Schistosoma mansoniMutation(s): 0 
Gene Names: Smp_059980
EC: 3.5.3.1
UniProt
Find proteins for Q6WVP6 (Schistosoma mansoni)
Explore Q6WVP6 
Go to UniProtKB:  Q6WVP6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6WVP6
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: 0.213 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 178.384α = 90
b = 178.384β = 90
c = 178.384γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-16
    Type: Initial release
  • Version 1.1: 2014-07-23
    Changes: Database references
  • Version 1.2: 2014-08-06
    Changes: Database references