ID   GPX4_HELAN              Reviewed;         180 AA.
AC   O23968;
DT   15-DEC-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1998, sequence version 1.
DT   25-MAY-2022, entry version 89.
DE   RecName: Full=Probable phospholipid hydroperoxide glutathione peroxidase;
DE            Short=PHGPx;
DE            EC=1.11.1.12;
DE   AltName: Full=Glutathione peroxidase 2;
GN   Name=GPXHA-2;
OS   Helianthus annuus (Common sunflower).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; campanulids; Asterales; Asteraceae; Asteroideae;
OC   Heliantheae alliance; Heliantheae; Helianthus.
OX   NCBI_TaxID=4232;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RA   Drevet J.R., Gagne G., Tourvieille de Labrouhe D., Nicolas P.,
RA   Dufaure J.-P., Ledoigt G., Roeckel-Drevet P.;
RL   Submitted (OCT-1997) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Protects cells and enzymes from oxidative damage, by
CC       catalyzing the reduction of hydrogen peroxide, lipid peroxides and
CC       organic hydroperoxide, by glutathione. {ECO:0000250|UniProtKB:O70325}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a hydroperoxy polyunsaturated fatty acid + 2 glutathione = a
CC         hydroxy polyunsaturated fatty acid + glutathione disulfide + H2O;
CC         Xref=Rhea:RHEA:19057, ChEBI:CHEBI:15377, ChEBI:CHEBI:57925,
CC         ChEBI:CHEBI:58297, ChEBI:CHEBI:131871, ChEBI:CHEBI:134019;
CC         EC=1.11.1.12; Evidence={ECO:0000250|UniProtKB:P36968};
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the glutathione peroxidase family.
CC       {ECO:0000305}.
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DR   EMBL; Y14707; CAA75009.1; -; mRNA.
DR   PIR; T12633; T12633.
DR   AlphaFoldDB; O23968; -.
DR   SMR; O23968; -.
DR   PeroxiBase; 2650; HaGPx06.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004602; F:glutathione peroxidase activity; IEA:InterPro.
DR   GO; GO:0047066; F:phospholipid-hydroperoxide glutathione peroxidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0006979; P:response to oxidative stress; IEA:InterPro.
DR   CDD; cd00340; GSH_Peroxidase; 1.
DR   InterPro; IPR000889; Glutathione_peroxidase.
DR   InterPro; IPR029759; GPX_AS.
DR   InterPro; IPR029760; GPX_CS.
DR   InterPro; IPR036249; Thioredoxin-like_sf.
DR   InterPro; IPR013766; Thioredoxin_domain.
DR   PANTHER; PTHR11592; PTHR11592; 1.
DR   Pfam; PF00255; GSHPx; 1.
DR   PIRSF; PIRSF000303; Glutathion_perox; 1.
DR   PRINTS; PR01011; GLUTPROXDASE.
DR   SUPFAM; SSF52833; SSF52833; 1.
DR   PROSITE; PS00460; GLUTATHIONE_PEROXID_1; 1.
DR   PROSITE; PS00763; GLUTATHIONE_PEROXID_2; 1.
DR   PROSITE; PS51355; GLUTATHIONE_PEROXID_3; 1.
PE   2: Evidence at transcript level;
KW   Cytoplasm; Oxidoreductase; Peroxidase.
FT   CHAIN           1..180
FT                   /note="Probable phospholipid hydroperoxide glutathione
FT                   peroxidase"
FT                   /id="PRO_0000066630"
FT   ACT_SITE        54
FT                   /evidence="ECO:0000250|UniProtKB:P36968"
SQ   SEQUENCE   180 AA;  20174 MW;  E33090EAAD2AADE0 CRC64;
     MATQTVFDFP DDVLQQPPMP ADNAFSDKDV KGQDVELSKY KGKVLLIVNV ASQCGFTNSN
     YPELTTLYQK YKDQGFEILA FPCNQFGGQE PGSNEEIQVF ACTRFKAEYP VFSKVNVNGK
     EADPLYKFLK SSKGGFLGDS IKWNFTKFLV DREGKVVDRY APTTSPLSIE KDIKKLLNVA