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- phytoene_synthase_family abstract "Squalene synthase EC (farnesyl-diphosphate farnesyltransferase) (SQS) and Phytoene synthase EC (PSY) are enzymes that share a number of functional similarities. These similarities are also reflected in their primary structure. In particular three well conserved regions are shared by SQS and PSY; they could be involved in substrate binding and/or the catalytic mechanism. SQS catalyzes the conversion of two molecules of farnesyl diphosphate (FPP) into squalene. It is the first committed step in the cholesterol biosynthetic pathway. The reaction carried out by SQS is catalyzed in two separate steps: the first is a head-to-head condensation of the two molecules of FPP to form presqualene diphosphate; this intermediate is then rearranged in a NADP-dependent reduction, to form squalene: 2 FPP -> presqualene diphosphate + NADP -> squalene SQS is found in eukaryotes. In yeast it is encoded by the ERG9 gene, in mammals by the FDFT1 gene. SQS is membrane-bound. PSY catalyzes the conversion of two molecules of geranylgeranyl diphosphate (GGPP) into phytoene. It is the second step in the biosynthesis of carotenoids from isopentenyl diphosphate. The reaction carried out by PSY is catalyzed in two separate steps: the first is a head-to-head condensation of the two molecules of GGPP to form prephytoene diphosphate; this intermediate is then rearranged to form phytoene. 2 GGPP -> prephytoene diphosphate -> phytoene PSY is found in all organisms that synthesize carotenoids: plants and photosynthetic bacteria as well as some non-photosynthetic bacteria and fungi. In bacteria PSY is encoded by the gene crtB. In plants PSY is localized in the chloroplast.".
- phytoene_synthase_family symbol "SQS_PSY".
- phytoene_synthase_family wikiPageExternalLink 2.5.1.21.
- phytoene_synthase_family wikiPageExternalLink 2.5.1.32.
- phytoene_synthase_family wikiPageID "39067728".
- phytoene_synthase_family wikiPageRevisionID "593085328".
- phytoene_synthase_family caption "crystal structure of the c carotenoid dehydrosqualene synthase from staphylococcus aureus complexed with bisphosphonate bph-700".
- phytoene_synthase_family interpro "IPR002060".
- phytoene_synthase_family name "SQS_PSY".
- phytoene_synthase_family opmFamily "474".
- phytoene_synthase_family opmProtein "3".
- phytoene_synthase_family pfam "PF00494".
- phytoene_synthase_family prosite "PDOC00802".
- phytoene_synthase_family scop "1".
- phytoene_synthase_family symbol "SQS_PSY".
- phytoene_synthase_family subject Category:EC_2.5.1.
- phytoene_synthase_family subject Category:Protein_domains.
- phytoene_synthase_family subject Category:Protein_families.
- phytoene_synthase_family type Biomolecule.
- phytoene_synthase_family type Protein.
- phytoene_synthase_family type BiologicalObject.
- phytoene_synthase_family comment "Squalene synthase EC (farnesyl-diphosphate farnesyltransferase) (SQS) and Phytoene synthase EC (PSY) are enzymes that share a number of functional similarities. These similarities are also reflected in their primary structure. In particular three well conserved regions are shared by SQS and PSY; they could be involved in substrate binding and/or the catalytic mechanism. SQS catalyzes the conversion of two molecules of farnesyl diphosphate (FPP) into squalene.".
- phytoene_synthase_family label "Squalene/phytoene synthase family".
- phytoene_synthase_family sameAs m.0swl5sz.
- phytoene_synthase_family sameAs Q17142935.
- phytoene_synthase_family sameAs Q17142935.
- phytoene_synthase_family wasDerivedFrom phytoene_synthase_family?oldid=593085328.
- phytoene_synthase_family isPrimaryTopicOf phytoene_synthase_family.