PORED_XENLA
ID PORED_XENLA Reviewed; 319 AA.
AC Q8AVI9;
DT 05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT 01-MAR-2003, sequence version 1.
DT 03-AUG-2022, entry version 70.
DE RecName: Full=Polyprenol reductase;
DE EC=1.3.1.94 {ECO:0000250|UniProtKB:Q9H8P0};
DE AltName: Full=3-oxo-5-alpha-steroid 4-dehydrogenase 3;
DE EC=1.3.1.22 {ECO:0000250|UniProtKB:Q9H8P0};
DE AltName: Full=Steroid 5-alpha-reductase 3;
DE Short=S5AR 3;
DE Short=SR type 3;
GN Name=srd5a3;
OS Xenopus laevis (African clawed frog).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Amphibia;
OC Batrachia; Anura; Pipoidea; Pipidae; Xenopodinae; Xenopus; Xenopus.
OX NCBI_TaxID=8355;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA].
RC TISSUE=Embryo;
RG NIH - Xenopus Gene Collection (XGC) project;
RL Submitted (JAN-2003) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Plays a key role in early steps of protein N-linked
CC glycosylation by being required for the conversion of polyprenol into
CC dolichol. Dolichols are required for the synthesis of dolichol-linked
CC monosaccharides and the oligosaccharide precursor used for N-
CC glycosylation. Acts as a polyprenol reductase that promotes the
CC reduction of the alpha-isoprene unit of polyprenols into dolichols in a
CC NADP-dependent mechanism. Also able to convert testosterone (T) into 5-
CC alpha-dihydrotestosterone (DHT). {ECO:0000250|UniProtKB:Q9H8P0}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=di-trans,poly-cis-dolichol + NADP(+) = di-trans,cis-polyprenol
CC + H(+) + NADPH; Xref=Rhea:RHEA:34279, Rhea:RHEA-COMP:9521, Rhea:RHEA-
CC COMP:9525, ChEBI:CHEBI:15378, ChEBI:CHEBI:16091, ChEBI:CHEBI:57783,
CC ChEBI:CHEBI:58349, ChEBI:CHEBI:67132; EC=1.3.1.94;
CC Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC PhysiologicalDirection=right-to-left; Xref=Rhea:RHEA:34281;
CC Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=a 3-oxo-5alpha-steroid + NADP(+) = a 3-oxo-Delta(4)-steroid +
CC H(+) + NADPH; Xref=Rhea:RHEA:54384, ChEBI:CHEBI:13601,
CC ChEBI:CHEBI:15378, ChEBI:CHEBI:47909, ChEBI:CHEBI:57783,
CC ChEBI:CHEBI:58349; EC=1.3.1.22;
CC Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC PhysiologicalDirection=right-to-left; Xref=Rhea:RHEA:54386;
CC Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=androst-4-ene-3,17-dione + H(+) + NADPH = 5alpha-androstan-
CC 3,17-dione + NADP(+); Xref=Rhea:RHEA:50816, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:15994, ChEBI:CHEBI:16422, ChEBI:CHEBI:57783,
CC ChEBI:CHEBI:58349; Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC PhysiologicalDirection=right-to-left; Xref=Rhea:RHEA:50818;
CC Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=17beta-hydroxy-5alpha-androstan-3-one + NADP(+) = H(+) + NADPH
CC + testosterone; Xref=Rhea:RHEA:50820, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:16330, ChEBI:CHEBI:17347, ChEBI:CHEBI:57783,
CC ChEBI:CHEBI:58349; EC=1.3.1.22;
CC Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC PhysiologicalDirection=right-to-left; Xref=Rhea:RHEA:50822;
CC Evidence={ECO:0000250|UniProtKB:Q9H8P0};
CC -!- PATHWAY: Protein modification; protein glycosylation.
CC {ECO:0000250|UniProtKB:Q9H8P0}.
CC -!- SUBCELLULAR LOCATION: Endoplasmic reticulum membrane
CC {ECO:0000250|UniProtKB:Q9H8P0}; Multi-pass membrane protein
CC {ECO:0000250|UniProtKB:Q9H8P0}.
CC -!- SIMILARITY: Belongs to the steroid 5-alpha reductase family. Polyprenol
CC reductase subfamily. {ECO:0000305}.
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DR EMBL; BC042255; AAH42255.1; -; mRNA.
DR RefSeq; NP_001079436.1; NM_001085967.1.
DR AlphaFoldDB; Q8AVI9; -.
DR DNASU; 379123; -.
DR GeneID; 379123; -.
DR KEGG; xla:379123; -.
DR CTD; 379123; -.
DR Xenbase; XB-GENE-985517; srd5a3.S.
DR OrthoDB; 1574389at2759; -.
DR UniPathway; UPA00378; -.
DR Proteomes; UP000186698; Chromosome 1S.
DR Bgee; 379123; Expressed in oocyte and 19 other tissues.
DR GO; GO:0005783; C:endoplasmic reticulum; ISS:UniProtKB.
DR GO; GO:0005789; C:endoplasmic reticulum membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR GO; GO:0003865; F:3-oxo-5-alpha-steroid 4-dehydrogenase activity; ISS:UniProtKB.
DR GO; GO:0047751; F:cholestenone 5-alpha-reductase activity; IEA:UniProtKB-EC.
DR GO; GO:0016628; F:oxidoreductase activity, acting on the CH-CH group of donors, NAD or NADP as acceptor; ISS:UniProtKB.
DR GO; GO:0102389; F:polyprenol reductase activity; IEA:UniProtKB-EC.
DR GO; GO:0019348; P:dolichol metabolic process; ISS:UniProtKB.
DR GO; GO:0006488; P:dolichol-linked oligosaccharide biosynthetic process; ISS:UniProtKB.
DR GO; GO:0016095; P:polyprenol catabolic process; ISS:UniProtKB.
DR InterPro; IPR001104; 3-oxo-5_a-steroid_4-DH_C.
DR InterPro; IPR039698; Dfg10/SRD5A3.
DR PANTHER; PTHR14624; PTHR14624; 1.
DR Pfam; PF02544; Steroid_dh; 1.
DR PROSITE; PS50244; S5A_REDUCTASE; 1.
PE 2: Evidence at transcript level;
KW Endoplasmic reticulum; Lipid metabolism; Membrane; NADP; Oxidoreductase;
KW Reference proteome; Transmembrane; Transmembrane helix.
FT CHAIN 1..319
FT /note="Polyprenol reductase"
FT /id="PRO_0000317705"
FT TOPO_DOM 1..12
FT /note="Cytoplasmic"
FT /evidence="ECO:0000255"
FT TRANSMEM 13..33
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TOPO_DOM 34..79
FT /note="Lumenal"
FT /evidence="ECO:0000255"
FT TRANSMEM 80..100
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TOPO_DOM 101..122
FT /note="Cytoplasmic"
FT /evidence="ECO:0000255"
FT TRANSMEM 123..143
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TOPO_DOM 144..158
FT /note="Lumenal"
FT /evidence="ECO:0000255"
FT TRANSMEM 159..179
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TOPO_DOM 180..195
FT /note="Cytoplasmic"
FT /evidence="ECO:0000255"
FT TRANSMEM 196..216
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TOPO_DOM 217..266
FT /note="Lumenal"
FT /evidence="ECO:0000255"
FT TRANSMEM 267..287
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TOPO_DOM 288..319
FT /note="Cytoplasmic"
FT /evidence="ECO:0000255"
SQ SEQUENCE 319 AA; 36591 MW; 5163DCD07643B1DB CRC64;
MQLVQLLPPG VSLLALVWLA VDAAFLTALL LYLQRGCDSG RSLLCSVFQD LIRYGKTKSG
LRRPSWLQWF DIPKRCFWHF YFVSLVWNGF LLWILLHLLL QSVPVPEWLQ AVLQFLCAGS
EPQVLGGELS VVLAFSLLWL HSLRRLLECL FVSIFSNGVI HFVQYCFGLG YYILIGFTIL
GYCPLDRRTA VSLDDLLMQG NWYHILGLTL YVWASLHQYT CHCILADLRK SASGAIINLK
HAVPTGDWFE KVSCPHYFAE LLIYLSIAVV FGLLNTIWWL VVLYVLLSQA LAAVLCHEFY
HEKFDSYPIH RKAFIPLIF
