peroxiredoxin; Provisional

Peroxiredoxin (PRX) family, 1-cys PRX subfamily; composed of PRXs containing only one conserved cysteine, which serves as the peroxidatic cysteine. They are homodimeric thiol-specific antioxidant (TSA) proteins that confer a protective role in cells by reducing and detoxifying hydrogen peroxide, peroxynitrite, and organic hydroperoxides. As with all other PRXs, a cysteine sulfenic acid intermediate is formed upon reaction of 1-cys PRX with its substrates. Having no resolving cysteine, the oxidized enzyme is resolved by an external small-molecule or protein reductant such as thioredoxin or glutaredoxin. Similar to typical 2-cys PRX, 1-cys PRX forms a functional dimeric unit with a B-type interface, as well as a decameric structure which is stabilized in the reduced form of the enzyme. Other oligomeric forms, tetramers and hexamers, have also been reported. Mammalian 1-cys PRX is localized cellularly in the cytosol and is expressed at high levels in brain, eye, testes and lung. The seed-specific plant 1-cys PRXs protect tissues from reactive oxygen species during desiccation and are also called rehydrins.

The GH18 (glycosyl hydrolases, family 18) type II chitinases hydrolyze chitin, an abundant polymer of N-acetylglucosamine and have been identified in bacteria, fungi, insects, plants, viruses, and protozoan parasites. The structure of this domain is an eight-stranded alpha/beta barrel with a pronounced active-site cleft at the C-terminal end of the beta-barrel.

Alkyl hydroperoxide reductase subunit AhpC (peroxiredoxin) [Defense mechanisms].

putative peroxiredoxin; Provisional

ChainAAA, Peroxiredoxin [Clostridioides difficile 630]

ChainAAA, Peroxiredoxin [Clostridioides difficile 630]

CrystalStructure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_F Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_G Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_H Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_I Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_J Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_L Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5]

CrystalStructure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_B Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_C Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_E Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5],5OVQ_K Crystal Structure of the peroxiredoxin (AhpC2) from the Hyperthermophilic bacteria Aquifex aeolicus VF [Aquifex aeolicus VF5]

1-CysSiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_B 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_C 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_D 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_E 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_F 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_G 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_H 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_I 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A],6Q5V_J 1-Cys SiPrx, a Prx6-family 1-Cys peroxiredoxin of the thermoacidophilic archaeon Sulfolobus islandicus [Sulfolobus islandicus REY15A]

Peroxiredoxin 2 OS=Caldanaerobacter subterraneus subsp. tengcongensis (strain DSM 15242 / JCM 11007 / NBRC 100824 / MB4) OX=273068 GN=TTE2186 PE=3 SV=1

Peroxiredoxin OS=Aquifex aeolicus (strain VF5) OX=224324 GN=aq_858 PE=1 SV=1

Peroxiredoxin OS=Thermoplasma volcanium (strain ATCC 51530 / DSM 4299 / JCM 9571 / NBRC 15438 / GSS1) OX=273116 GN=TV1123 PE=3 SV=1

Peroxiredoxin OS=Methanosarcina mazei (strain ATCC BAA-159 / DSM 3647 / Goe1 / Go1 / JCM 11833 / OCM 88) OX=192952 GN=MM_0814 PE=3 SV=1

Peroxiredoxin 2 OS=Sulfurisphaera tokodaii (strain DSM 16993 / JCM 10545 / NBRC 100140 / 7) OX=273063 GN=STK_24420 PE=3 SV=1