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・ Farnese Gardens
・ Farnese Hercules
・ Farnese Hours
・ Farnese, Lazio
・ Farneseite
・ Farnesene
・ Farnesina
・ Farnesina Experimenta Art Collection
・ Farnesoid X receptor
・ Farnesol
・ Farnesol 2-isomerase
・ Farnesol dehydrogenase
・ Farnesyl diphosphatase
・ Farnesyl pyrophosphate
・ Farnesyl pyrophosphate cyclase
Farnesyl-diphosphate farnesyltransferase
・ Farnesyl-diphosphate kinase
・ Farnesylcysteine lyase
・ Farnesyltransferase
・ Farnesyltransferase (disambiguation)
・ Farnesyltransferase inhibitor
・ Farnesyltranstransferase
・ Farneta
・ Farnetta
・ Farneworth
・ Farney
・ Farney (barony)
・ Farnfold
・ Farnham
・ Farnham (disambiguation)


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Farnesyl-diphosphate farnesyltransferase : ウィキペディア英語版
Farnesyl-diphosphate farnesyltransferase

Squalene synthase (SQS) or farnesyl-diphosphate:farnesyl-diphosphate farnesyl transferase is an enzyme localized to the membrane of the endoplasmic reticulum. SQS participates in the isoprenoid biosynthetic pathway, catalyzing a two-step reaction in which two identical molecules of farnesyl pyrophosphate (FPP) are converted into squalene, with the consumption of NADPH. Catalysis by SQS is the first committed step in sterol synthesis, since the squalene produced is converted exclusively into various sterols, such as cholesterol, via a complex, multi-step pathway. SQS belongs to squalene/phytoene synthase family of proteins.
==Diversity==
Squalene synthase has been characterized in animals, plants, and yeast. In terms of structure and mechanics, squalene synthase closely resembles phytoene synthase (PHS), another prenyltransferase. PHS serves a similar role to SQS in plants and bacteria, catalyzing the synthesis of phytoene, a precursor of carotenoid compounds.

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