6VPD

Crystal structure of Trgpx in apo form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 

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Literature

Structural and functional characterization of the glutathione peroxidase-like thioredoxin peroxidase from the fungus Trichoderma reesei.

Adriani, P.P.de Paiva, F.C.R.de Oliveira, G.S.Leite, A.C.Sanches, A.S.Lopes, A.R.Dias, M.V.B.Chambergo, F.S.

(2020) Int J Biol Macromol 167: 93-100

  • DOI: https://doi.org/10.1016/j.ijbiomac.2020.11.179
  • Primary Citation of Related Structures:  
    6VPD

  • PubMed Abstract: 

    Glutathione peroxidases (GPx) are a family of enzymes with the ability to reduce organic and inorganic hydroperoxides to the corresponding alcohols using glutathione or thioredoxin as an electron donor. Here, we report the functional and structural characterization of a GPx identified in Trichoderma reesei (TrGPx). TrGPx was recombinantly expressed in a bacterial host and purified using affinity. Using a thioredoxin coupled assay, TrGPx exhibited activity of 28 U and 12.5 U in the presence of the substrates H 2 O 2 and t-BOOH, respectively, and no activity was observed when glutathione was used. These results indicated that TrGPx is a thioredoxin peroxidase and hydrolyses H 2 O 2 better than t-BOOH. TrGPx kinetic parameters using a pyrogallol assay resulted at K mapp  = 11.7 mM , V maxapp  = 10.9 IU/μg TrGPx, k cat  = 19 s -1 and a catalytic efficiency of 1.6 mM -1  s -1 to H 2 O 2 as substrate. Besides that, TrGPx demonstrated an optimum pH ranging from 9.0-12.0 and a half-life of 36 min at 80 °C. TrGPx 3D-structure was obtained in a reduced state and non-catalytic conformation. The overall fold is similar to the other phospholipid-hydroperoxide glutathione peroxidases. These data contribute to understand the antioxidant mechanism in fungi and provide information for using antioxidant enzymes in biotechnological applications.


  • Organizational Affiliation

    Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, 1000 Arlindo Bettio Avenue, São Paulo, Brazil.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutathione peroxidase
A, B
192Trichoderma reesei QM6aMutation(s): 0 
Gene Names: TRIREDRAFT_47136
UniProt
Find proteins for G0RHF8 (Hypocrea jecorina (strain QM6a))
Explore G0RHF8 
Go to UniProtKB:  G0RHF8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG0RHF8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 
  • Space Group: I 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.128α = 90
b = 43.636β = 108.43
c = 103.498γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Brazilian National Council for Scientific and Technological DevelopmentBrazil142311/2016-2
Sao Paulo Research FoundationBrazil2017/25705-8
Sao Paulo Research FoundationBrazil2014/24107-1
Brazilian National Council for Scientific and Technological DevelopmentBrazil141090/2016-2

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-16
    Type: Initial release
  • Version 1.1: 2023-10-11
    Changes: Data collection, Database references, Refinement description