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2.5.1.21: squalene synthase

This is an abbreviated version!
For detailed information about squalene synthase, go to the full flat file.

Word Map on EC 2.5.1.21

Reaction

2 (2E,6E)-farnesyl diphosphate +

NAD(P)H
+
H+
=
squalene
 + 2 diphosphate +
NAD(P)+

Synonyms

BbSS, BSS, CrSQS, dt-ySQase, Erg9, EtSS, farnesyl-diphosphate farnesyltransferase, farnesyl-diphosphate:farnesyldiphosphate farnesyltransferase, farnesyldiphosphate farnesyltransferase 1, farnesyldiphosphate:farnesyldiphosphate farnesyltransferase, farnesyltransferase, FDFT1, hSQS, presqualene synthase, presqualene-diphosphate synthase, SgSQS, SQase, SQS, SQS1, SQS2, squalene synthase, squalene synthase 1, squalene synthase 2, squalene synthetase, SS1, SSase, SSN, synthase, squalene, TkSQS1, TkSQS2

ECTree

     2 Transferases
         2.5 Transferring alkyl or aryl groups, other than methyl groups
             2.5.1 Transferring alkyl or aryl groups, other than methyl groups (only sub-subclass identified to date)
                2.5.1.21 squalene synthase

Systematic Name

Systematic Name on EC 2.5.1.21 - squalene synthase

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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].