ID   TDXH1_SULME             Reviewed;         215 AA.
AC   Q55060;
DT   15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   03-AUG-2022, entry version 91.
DE   RecName: Full=Peroxiredoxin 1 {ECO:0000255|HAMAP-Rule:MF_00401};
DE            EC=1.11.1.24 {ECO:0000255|HAMAP-Rule:MF_00401};
DE   AltName: Full=Thioredoxin-dependent peroxiredoxin 1 {ECO:0000255|HAMAP-Rule:MF_00401};
OS   Sulfuracidifex metallicus (Sulfolobus metallicus).
OC   Archaea; Crenarchaeota; Thermoprotei; Sulfolobales; Sulfolobaceae;
OC   Sulfuracidifex.
OX   NCBI_TaxID=47303;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=LM;
RX   PubMed=8593961; DOI=10.1111/j.1574-6968.1995.tb07920.x;
RA   Burton N.P., Williams T.D., Norris P.R.;
RT   "A potential anti-oxidant protein in a ferrous iron-oxidizing Sulfolobus
RT   species.";
RL   FEMS Microbiol. Lett. 134:91-95(1995).
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:0000255|HAMAP-Rule:MF_00401}.
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:0000255|HAMAP-
CC         Rule:MF_00401};
CC   -!- SUBUNIT: Homodecamer. Pentamer of dimers that assemble into a ring
CC       structure. {ECO:0000255|HAMAP-Rule:MF_00401}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00401}.
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 1-Cys
CC       peroxiredoxin, no C(R) is present and C(P) instead forms a disulfide
CC       with a cysteine from another protein or with a small thiol molecule.
CC       {ECO:0000255|HAMAP-Rule:MF_00401}.
CC   -!- SIMILARITY: Belongs to the peroxiredoxin family. Prx6 subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_00401}.
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DR   EMBL; U36479; AAB02185.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q55060; -.
DR   SMR; Q55060; -.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004601; F:peroxidase activity; IEA:UniProtKB-KW.
DR   GO; GO:0051920; F:peroxiredoxin activity; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_00401; Peroxiredoxin; 1.
DR   InterPro; IPR000866; AhpC/TSA.
DR   InterPro; IPR024706; Peroxiredoxin_AhpC-typ.
DR   InterPro; IPR019479; Peroxiredoxin_C.
DR   InterPro; IPR022915; Peroxiredoxin_TDXH.
DR   InterPro; IPR036249; Thioredoxin-like_sf.
DR   InterPro; IPR013766; Thioredoxin_domain.
DR   Pfam; PF10417; 1-cysPrx_C; 1.
DR   Pfam; PF00578; AhpC-TSA; 1.
DR   PIRSF; PIRSF000239; AHPC; 1.
DR   SUPFAM; SSF52833; SSF52833; 1.
DR   PROSITE; PS51352; THIOREDOXIN_2; 1.
PE   3: Inferred from homology;
KW   Antioxidant; Cytoplasm; Oxidoreductase; Peroxidase; Redox-active center.
FT   CHAIN           1..215
FT                   /note="Peroxiredoxin 1"
FT                   /id="PRO_0000135167"
FT   DOMAIN          1..157
FT                   /note="Thioredoxin"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00401"
FT   ACT_SITE        45
FT                   /note="Cysteine sulfenic acid (-SOH) intermediate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00401"
FT   BINDING         120
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00401"
SQ   SEQUENCE   215 AA;  25016 MW;  BE32C83CA9D89039 CRC64;
     MKLYQKFPET QVITTKGPLD FYRDVFEKGK WLFLFAHPAD FTPVCTTEFV GFSKVYEEFK
     RLNVELVGMS VDSIYSHIEW LKDIQERYGI QVPFPLIADP DKRLARLLDI IDEASGVTIR
     AVFLVNPEGI IRFMAYYPIE YGRKIEELLR ITKAALVNYK AKVSLPVDWE PGQEVIVPAP
     STIDEAQIRM KLPNAKTWYL TFKKYDELPQ DQRVV