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Information on EC 2.5.1.21 - squalene synthase

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EC Tree
IUBMB Comments
This microsomal enzyme catalyses the first committed step in the biosynthesis of sterols. The enzyme from yeast requires either Mg2+ or Mn2+ for activity. In the absence of NAD(P)H, presqualene diphosphate (PSPP) is accumulated. When NAD(P)H is present, presqualene diphosphate does not dissociate from the enzyme during the synthesis of squalene from farnesyl diphosphate (FPP) . High concentrations of FPP inhibit the production of squalene but not of PSPP .
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UNIPROT: P53866
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Word Map
The expected taxonomic range for this enzyme is: Bacteria, Eukaryota, Archaea
Synonyms
farnesyltransferase, squalene synthase, sqs, fdft1, squalene synthetase, farnesyl-diphosphate farnesyltransferase, sgsqs, ssase, sqase, tksqs1, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
farnesyl-diphosphate farnesyltransferase
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farnesyldiphosphate:farnesyldiphosphate farnesyltransferase
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farnesyltransferase
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presqualene synthase
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presqualene-diphosphate synthase
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squalene synthase
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squalene synthetase
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synthase, squalene
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
alkenyl group transfer
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SYSTEMATIC NAME
IUBMB Comments
(2E,6E)-farnesyl-diphosphate:(2E,6E)-farnesyl-diphosphate farnesyltransferase
This microsomal enzyme catalyses the first committed step in the biosynthesis of sterols. The enzyme from yeast requires either Mg2+ or Mn2+ for activity. In the absence of NAD(P)H, presqualene diphosphate (PSPP) is accumulated. When NAD(P)H is present, presqualene diphosphate does not dissociate from the enzyme during the synthesis of squalene from farnesyl diphosphate (FPP) [8]. High concentrations of FPP inhibit the production of squalene but not of PSPP [8].
CAS REGISTRY NUMBER
COMMENTARY hide
9077-14-9
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INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
additional information
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ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
squalene synthase consists of both an N-terminal catalytic domain and a C-terminal domain which consists of a hinge region and a membrane spanning helix responsible for tethering the enzyme to the cytosolic face of the endoplasmic reticulum
Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
metabolism
physiological function
the catalytic domain performs the head-to-head dimerization of two molecules of farnesyl diphosphate to form squalene, a 30 carbon isoprenoid oxidized by squalene monooxygenase (Erg1) and cyclized by lanosterol synthase
additional information
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
SQS1_YEAST
Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
767
0
86950
Swiss-Prot
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SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
additional information
PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
additional information
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
gene erg9, recombinant expression in enzyme-deficient SQS-knockout Saccharomyces cerevisiae DELTAerg9 strain, the endogenous enzyme partially complements the knockout mutation, restoration of the complete complementation phenotype is mapped to a 26-amino acid hinge region linking the catalytic and membrane-spanning domains specific to fungal squalene synthases
gene ysqs, recombinant expression of wild-type and endgineered enzymes in Escherichia coli strain XL1-Blue, coexpression with gene crtN encoding DSQ desaturase from Staphylococcus aureus in Escherichia coli results in carotinoid production and accumulation of C30 carotenoid pigments, which does not happen with coexpression of gene crtI encoding Pantoea ananatis phytoene desaturase, carotenoid pigment analysis, overview
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Linscott, K.B.; Niehaus, T.D.; Zhuang, X.; Bell, S.A.; Chappell, J.
Mapping a kingdom-specific functional domain of squalene synthase
Biochim. Biophys. Acta
1861
1049-1057
2016
Arabidopsis thaliana, Homo sapiens (P37268), Saccharomyces cerevisiae (P53866), Saccharomyces cerevisiae, Botryococcus braunii (Q9SDW9)
Manually annotated by BRENDA team
Furubayashi, M.; Li, L.; Katabami, A.; Saito, K.; Umeno, D.
Directed evolution of squalene synthase for dehydrosqualene biosynthesis
FEBS Lett.
588
3375-3381
2014
Thermosynechococcus vestitus, Homo sapiens (P37268), Homo sapiens, Saccharomyces cerevisiae (P53866), Saccharomyces cerevisiae
Manually annotated by BRENDA team