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Glutathione reductase and thioredoxin reductase at the crossroad: The structure of Schistosoma mansoni thioredoxin glutathione reductase
Author(s) -
Angelucci Francesco,
Miele Adriana E.,
Boumis Giovanna,
Dimastrogiovanni Daniela,
Brunori Maurizio,
Bellelli Andrea
Publication year - 2008
Publication title -
proteins: structure, function, and bioinformatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.699
H-Index - 191
eISSN - 1097-0134
pISSN - 0887-3585
DOI - 10.1002/prot.21986
Subject(s) - glutaredoxin , thioredoxin reductase , thioredoxin , schistosoma mansoni , biochemistry , glutathione reductase , biology , selenoprotein , enzyme , glutathione , reductase , selenocysteine , ferredoxin thioredoxin reductase , cysteine , glutathione peroxidase , schistosomiasis , zoology , helminths
Thioredoxin glutathione reductase (TGR) is a key flavoenzyme expressed by schistosomes that bridges two detoxification pathways crucial for the parasite survival in the host's organism. In this article we report the crystal structure (at 2.2 Å resolution) of TGR from Schistosoma mansoni (SmTGR), deleted in the last two residues. The structure reveals the peculiar architecture of this chimeric enzyme: the small Glutaredoxin (Grx) domain at the N‐terminus is joined to the large thioredoxin reductase (TR) one via an extended complementary surface, involving residues not conserved in the Grx superfamily; the TR domain interacts with an identical partner via its C‐terminal domain, forming a dimer with a twisted “W” shape. Although lacking the penultimate Selenocysteine residue (Sec), the enzyme is still able to reduce oxidized glutathione. These data update the interpretation of the interdomain communication in TGR enzymes. The possible function of this enzyme in pathogenic parasites is discussed. Proteins 2008. © 2008 Wiley‐Liss, Inc.