CP17A_PAPHU
ID CP17A_PAPHU Reviewed; 508 AA.
AC Q9GLD2; Q95M62;
DT 28-NOV-2003, integrated into UniProtKB/Swiss-Prot.
DT 01-MAR-2001, sequence version 1.
DT 03-AUG-2022, entry version 93.
DE RecName: Full=Steroid 17-alpha-hydroxylase/17,20 lyase;
DE EC=1.14.14.19 {ECO:0000269|PubMed:12423360};
DE EC=1.14.14.32 {ECO:0000269|PubMed:12423360};
DE AltName: Full=CYPXVII;
DE AltName: Full=Cytochrome P450 17A1;
DE AltName: Full=Cytochrome P450-C17;
DE Short=Cytochrome P450c17;
DE AltName: Full=Steroid 17-alpha-monooxygenase;
GN Name=CYP17A1; Synonyms=CYP17;
OS Papio hamadryas ursinus (Chacma baboon).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini;
OC Cercopithecidae; Cercopithecinae; Papio.
OX NCBI_TaxID=36229;
RN [1]
RP NUCLEOTIDE SEQUENCE.
RC TISSUE=Adrenal gland;
RA Swart A.C., Kolar N.W., Swart P.;
RT "Cloning and expression of baboon cytochrome P-450 17-alpha
RT hydroxylase/c17-20 lyase.";
RL Submitted (AUG-2000) to the EMBL/GenBank/DDBJ databases.
RN [2]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA], FUNCTION, AND CATALYTIC ACTIVITY.
RX PubMed=12423360; DOI=10.1046/j.1432-1033.2002.03268.x;
RA Swart A.C., Kolar N.W., Lombard N., Mason J.I., Swart P.;
RT "Baboon cytochrome P450 17alpha-hydroxylase/17,20-lyase (CYP17).";
RL Eur. J. Biochem. 269:5608-5616(2002).
CC -!- FUNCTION: A cytochrome P450 monooxygenase involved in corticoid and
CC androgen biosynthesis. Catalyzes 17-alpha hydroxylation of C21
CC steroids, which is common for both pathways (PubMed:12423360). A second
CC oxidative step, required only for androgen synthesis, involves an acyl-
CC carbon cleavage. Hydroxylates pregnenolone to form 17-alpha
CC pregnenolone, followed by the cleavage of the C17-C20 bond to form
CC dehydroepiandrosterone (DHEA) (PubMed:12423360). Has 17-alpha
CC hydroxylase activity toward progesterone (PubMed:12423360). The 17-
CC alpha hydroxy intermediates, as part of adrenal glucocorticoids
CC biosynthesis pathway, are precursors of cortisol. Mechanistically, uses
CC molecular oxygen inserting one oxygen atom into a substrate, and
CC reducing the second into a water molecule, with two electrons provided
CC by NADPH via cytochrome P450 reductase (CPR; NADPH-ferrihemoprotein
CC reductase) (By similarity). {ECO:0000250|UniProtKB:P05093,
CC ECO:0000269|PubMed:12423360}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=a C21-steroid + O2 + reduced [NADPH--hemoprotein reductase] =
CC a 17alpha-hydroxy-C21-steroid + H(+) + H2O + oxidized [NADPH--
CC hemoprotein reductase]; Xref=Rhea:RHEA:65760, Rhea:RHEA-COMP:11964,
CC Rhea:RHEA-COMP:11965, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:15379, ChEBI:CHEBI:57618, ChEBI:CHEBI:58210,
CC ChEBI:CHEBI:61313, ChEBI:CHEBI:138141; EC=1.14.14.19;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:65761;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=O2 + progesterone + reduced [NADPH--hemoprotein reductase] =
CC 17alpha-hydroxyprogesterone + H(+) + H2O + oxidized [NADPH--
CC hemoprotein reductase]; Xref=Rhea:RHEA:46308, Rhea:RHEA-COMP:11964,
CC Rhea:RHEA-COMP:11965, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:15379, ChEBI:CHEBI:17026, ChEBI:CHEBI:17252,
CC ChEBI:CHEBI:57618, ChEBI:CHEBI:58210; EC=1.14.14.19;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:46309;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=O2 + pregnenolone + reduced [NADPH--hemoprotein reductase] =
CC 17alpha-hydroxypregnenolone + H(+) + H2O + oxidized [NADPH--
CC hemoprotein reductase]; Xref=Rhea:RHEA:50236, Rhea:RHEA-COMP:11964,
CC Rhea:RHEA-COMP:11965, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:15379, ChEBI:CHEBI:16581, ChEBI:CHEBI:28750,
CC ChEBI:CHEBI:57618, ChEBI:CHEBI:58210; EC=1.14.14.19;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:50237;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=17alpha-hydroxypregnenolone + O2 + reduced [NADPH--hemoprotein
CC reductase] = 3beta-hydroxyandrost-5-en-17-one + acetate + 2 H(+) +
CC H2O + oxidized [NADPH--hemoprotein reductase]; Xref=Rhea:RHEA:50244,
CC Rhea:RHEA-COMP:11964, Rhea:RHEA-COMP:11965, ChEBI:CHEBI:15377,
CC ChEBI:CHEBI:15378, ChEBI:CHEBI:15379, ChEBI:CHEBI:28689,
CC ChEBI:CHEBI:28750, ChEBI:CHEBI:30089, ChEBI:CHEBI:57618,
CC ChEBI:CHEBI:58210; EC=1.14.14.32;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:50245;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC -!- COFACTOR:
CC Name=heme; Xref=ChEBI:CHEBI:30413;
CC Evidence={ECO:0000250|UniProtKB:P05093};
CC -!- ACTIVITY REGULATION: Regulated predominantly by intracellular cAMP
CC levels. The 17,20-lyase activity is stimulated by cytochrome b5, which
CC acts as an allosteric effector increasing the Vmax of the lyase
CC activity. {ECO:0000250|UniProtKB:P05093}.
CC -!- PATHWAY: Steroid hormone biosynthesis. {ECO:0000250|UniProtKB:P05093}.
CC -!- PATHWAY: Steroid biosynthesis; glucocorticoid biosynthesis.
CC {ECO:0000250|UniProtKB:P05093}.
CC -!- SUBCELLULAR LOCATION: Endoplasmic reticulum membrane
CC {ECO:0000250|UniProtKB:P05093}. Microsome membrane
CC {ECO:0000250|UniProtKB:P05093}.
CC -!- SIMILARITY: Belongs to the cytochrome P450 family. {ECO:0000305}.
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DR EMBL; AF297650; AAG10599.1; -; mRNA.
DR EMBL; AY034635; AAK57726.1; -; Genomic_DNA.
DR AlphaFoldDB; Q9GLD2; -.
DR SMR; Q9GLD2; -.
DR BRENDA; 1.14.14.19; 4524.
DR UniPathway; UPA00788; -.
DR GO; GO:0005789; C:endoplasmic reticulum membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0047442; F:17-alpha-hydroxyprogesterone aldolase activity; ISS:UniProtKB.
DR GO; GO:0020037; F:heme binding; ISS:UniProtKB.
DR GO; GO:0005506; F:iron ion binding; IEA:InterPro.
DR GO; GO:0004508; F:steroid 17-alpha-monooxygenase activity; ISS:UniProtKB.
DR GO; GO:0006704; P:glucocorticoid biosynthetic process; IEA:UniProtKB-UniPathway.
DR GO; GO:0042446; P:hormone biosynthetic process; ISS:UniProtKB.
DR GO; GO:0042448; P:progesterone metabolic process; ISS:UniProtKB.
DR GO; GO:0008202; P:steroid metabolic process; ISS:UniProtKB.
DR Gene3D; 1.10.630.10; -; 1.
DR InterPro; IPR001128; Cyt_P450.
DR InterPro; IPR017972; Cyt_P450_CS.
DR InterPro; IPR002401; Cyt_P450_E_grp-I.
DR InterPro; IPR036396; Cyt_P450_sf.
DR Pfam; PF00067; p450; 1.
DR PRINTS; PR00463; EP450I.
DR PRINTS; PR00385; P450.
DR SUPFAM; SSF48264; SSF48264; 1.
DR PROSITE; PS00086; CYTOCHROME_P450; 1.
PE 1: Evidence at protein level;
KW Endoplasmic reticulum; Heme; Iron; Lipid metabolism; Lyase; Membrane;
KW Metal-binding; Microsome; Monooxygenase; Oxidoreductase; Steroidogenesis.
FT CHAIN 1..508
FT /note="Steroid 17-alpha-hydroxylase/17,20 lyase"
FT /id="PRO_0000051938"
FT BINDING 202
FT /ligand="substrate"
FT /evidence="ECO:0000250|UniProtKB:P05093"
FT BINDING 442
FT /ligand="heme"
FT /ligand_id="ChEBI:CHEBI:30413"
FT /ligand_part="Fe"
FT /ligand_part_id="ChEBI:CHEBI:18248"
FT /note="axial binding residue"
FT /evidence="ECO:0000250"
FT CONFLICT 331
FT /note="G -> E (in Ref. 2; AAK57726)"
FT /evidence="ECO:0000305"
FT CONFLICT 396
FT /note="L -> R (in Ref. 2; AAK57726)"
FT /evidence="ECO:0000305"
SQ SEQUENCE 508 AA; 57566 MW; 40DF6068D66BAA80 CRC64;
MWELVALLLL TLAYLFWPKR RCPGAKYPKS LLSLPLVGSL PFLPRHGHMH NNFFKLQKKY
GPIYSVRMGT KTTVIVGHHQ LAKEVLIKKG KDFSGRPQVT TLDILSNNRK GIAFADYGAH
WQLHRRLAMA TFALFKDGDQ KLEKIICQEI STLCDMLATH NGQTIDISFP VFVAITNVIS
LICFNISYKN GDPELKIVHN YNEGIIDSLG KESLVDLFPW LKVFPNKTLE KLKRHVKTRN
DLLTKIFENY KEKFRSDSIT NMLDVLMQAK MNSDNGNAGP DQDSELLSDN HILTTIGDIF
GAGVETTTSV VKWIVAFLLH NPQVKKKLYE GIDQNVGFSR TPTISDRNRL LLLEATIREV
LRIRPVAPML IPHKANVDSS IGEFAVDKGT HVIINLWALH HNEKEWHQPD QFMPERFLNP
AGTQLISPSL SYLPFGAGPR SCIGEILARQ ELFLIMAWLL QRFDLEVPDD GQLPSLEGNP
KVVFLIDSFK VKIKVRQAWR EAQAEGST
