ID A0A191TPH1_9BACT Unreviewed; 166 AA.
AC A0A191TPH1;
DT 05-OCT-2016, integrated into UniProtKB/TrEMBL.
DT 05-OCT-2016, sequence version 1.
DT 27-MAR-2024, entry version 32.
DE RecName: Full=Thiol peroxidase {ECO:0000256|HAMAP-Rule:MF_00269};
DE Short=Tpx {ECO:0000256|HAMAP-Rule:MF_00269};
DE EC=1.11.1.24 {ECO:0000256|HAMAP-Rule:MF_00269};
DE AltName: Full=Peroxiredoxin tpx {ECO:0000256|HAMAP-Rule:MF_00269};
DE Short=Prx {ECO:0000256|HAMAP-Rule:MF_00269};
DE AltName: Full=Thioredoxin peroxidase {ECO:0000256|HAMAP-Rule:MF_00269};
DE AltName: Full=Thioredoxin-dependent peroxiredoxin {ECO:0000256|HAMAP-Rule:MF_00269};
GN Name=tpx {ECO:0000256|HAMAP-Rule:MF_00269};
GN ORFNames=A9P82_05095 {ECO:0000313|EMBL:ANI90633.1};
OS Arachidicoccus sp. BS20.
OC Bacteria; Bacteroidota; Chitinophagia; Chitinophagales; Chitinophagaceae;
OC Arachidicoccus.
OX NCBI_TaxID=1850526 {ECO:0000313|EMBL:ANI90633.1, ECO:0000313|Proteomes:UP000078308};
RN [1] {ECO:0000313|EMBL:ANI90633.1, ECO:0000313|Proteomes:UP000078308}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=BS20 {ECO:0000313|EMBL:ANI90633.1,
RC ECO:0000313|Proteomes:UP000078308};
RA Im W.T., Siddiqi M.Z.;
RT "Arachidicoccus sp. BS20 whole genome sequincing.";
RL Submitted (MAY-2016) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Thiol-specific peroxidase that catalyzes the reduction of
CC hydrogen peroxide and organic hydroperoxides to water and alcohols,
CC respectively. Plays a role in cell protection against oxidative stress
CC by detoxifying peroxides. {ECO:0000256|HAMAP-Rule:MF_00269}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=[thioredoxin]-dithiol + a hydroperoxide = [thioredoxin]-
CC disulfide + an alcohol + H2O; Xref=Rhea:RHEA:62620, Rhea:RHEA-
CC COMP:10698, Rhea:RHEA-COMP:10700, ChEBI:CHEBI:15377,
CC ChEBI:CHEBI:29950, ChEBI:CHEBI:30879, ChEBI:CHEBI:35924,
CC ChEBI:CHEBI:50058; EC=1.11.1.24; Evidence={ECO:0000256|HAMAP-
CC Rule:MF_00269};
CC -!- SUBUNIT: Homodimer. {ECO:0000256|HAMAP-Rule:MF_00269}.
CC -!- MISCELLANEOUS: The active site is a conserved redox-active cysteine
CC residue, the peroxidatic cysteine (C(P)), which makes the nucleophilic
CC attack on the peroxide substrate. The peroxide oxidizes the C(P)-SH to
CC cysteine sulfenic acid (C(P)-SOH), which then reacts with another
CC cysteine residue, the resolving cysteine (C(R)), to form a disulfide
CC bridge. The disulfide is subsequently reduced by an appropriate
CC electron donor to complete the catalytic cycle. In this atypical 2-Cys
CC peroxiredoxin, C(R) is present in the same subunit to form an
CC intramolecular disulfide. The disulfide is subsequently reduced by
CC thioredoxin. {ECO:0000256|HAMAP-Rule:MF_00269}.
CC -!- SIMILARITY: Belongs to the peroxiredoxin family. Tpx subfamily.
CC {ECO:0000256|HAMAP-Rule:MF_00269}.
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DR EMBL; CP015971; ANI90633.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A191TPH1; -.
DR STRING; 1850526.A9P82_05095; -.
DR KEGG; arb:A9P82_05095; -.
DR Proteomes; UP000078308; Chromosome.
DR GO; GO:0008379; F:thioredoxin peroxidase activity; IEA:UniProtKB-UniRule.
DR CDD; cd03014; PRX_Atyp2cys; 1.
DR Gene3D; 3.40.30.10; Glutaredoxin; 1.
DR HAMAP; MF_00269; Tpx; 1.
DR InterPro; IPR013740; Redoxin.
DR InterPro; IPR036249; Thioredoxin-like_sf.
DR InterPro; IPR013766; Thioredoxin_domain.
DR InterPro; IPR002065; TPX.
DR InterPro; IPR018219; Tpx_CS.
DR PANTHER; PTHR43110; THIOL PEROXIDASE; 1.
DR PANTHER; PTHR43110:SF1; THIOL PEROXIDASE; 1.
DR Pfam; PF08534; Redoxin; 1.
DR SUPFAM; SSF52833; Thioredoxin-like; 1.
DR PROSITE; PS51352; THIOREDOXIN_2; 1.
DR PROSITE; PS01265; TPX; 1.
PE 3: Inferred from homology;
KW Antioxidant {ECO:0000256|ARBA:ARBA00022862, ECO:0000256|HAMAP-
KW Rule:MF_00269}; Disulfide bond {ECO:0000256|HAMAP-Rule:MF_00269};
KW Oxidoreductase {ECO:0000256|HAMAP-Rule:MF_00269};
KW Peroxidase {ECO:0000256|HAMAP-Rule:MF_00269, ECO:0000313|EMBL:ANI90633.1};
KW Redox-active center {ECO:0000256|HAMAP-Rule:MF_00269};
KW Reference proteome {ECO:0000313|Proteomes:UP000078308}.
FT DOMAIN 19..166
FT /note="Thioredoxin"
FT /evidence="ECO:0000259|PROSITE:PS51352"
FT ACT_SITE 61
FT /note="Cysteine sulfenic acid (-SOH) intermediate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00269"
FT DISULFID 61..95
FT /note="Redox-active"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00269"
SQ SEQUENCE 166 AA; 17718 MW; BE613847E8DB0C00 CRC64;
MGTTITLKGN EIHTVGTLPS VGTEAKDFTL TADDLSDKML SEYKGKNIIL NIFPSVNTGV
CAASVRKFNE DAAGLSNTIV LCISKDLPFA QAQFCGAEGI KNVVMLSDFR TDFGHEYGVQ
IADGPLKGLL SRAVVVINPE GKVVYEEQVP EITHEPDYAA ALAAVK
//
