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Overview

Uniprot IDA0A5G2QZ00
Protein NameSqualene synthase
Gene NameFDFT1
OrganismSus scrofa

Kla Sites from experimental identification

Position Flanking peptide
33 SSLKTCYKYLNQTSR

Function

Catalyzes the condensation of 2 farnesyl pyrophosphate (FPP) moieties to form squalene. Proceeds in two distinct steps. In the first half-reaction, two molecules of FPP react to form the stable presqualene diphosphate intermediate (PSQPP), with concomitant release of a proton and a molecule of inorganic diphosphate. In the second half-reaction, PSQPP undergoes heterolysis, isomerization, and reduction with NADPH or NADH to form squalene. It is the first committed enzyme of the sterol biosynthesis pathway

Protein Sequence

10 VSESHSSSSA 20 SPTAVCVLCP 30 QDSLSSSLKT 40 CYKYLNQTSR 50 SFAAVIQALD 60 GEMRHAVCIF 70 YLVLRALDTL 80 EDDMTISIEK 90 KIPLLHNFHL 100 HLYESDWRFT 110 ESKEKDRQVL 120 EDFPTIALEF 130 RNLAEKYQVV 140 IVDVCRKMGF 150 GMAEFLNKHV 160 TSEREWDKYC 170 HYVAGLVGIG 180 LSRLFSASEL 190 EDPLVGEDTE 200 RANSMGLFLQ 210 KTNIIRDYLE 220 DQQEGREFWP 230 QEVWSKYVKK 240 LGDFAKPENV 250 DLAVQCLNEL 260 VTSTLHHIPD 270 VITYLSRLRN 280 QSIFNFCAIP 290 QVMAIATLAA 300 CYNNQQVFKG 310 VVKIRKGQAV 320 TLMMDATNMP 330 AVKAIIHQYM 340 EEIYHRIPDS 350 DPYSAKTRQI 360 ISTIRTQNLP 370 NCQLISRSHY 380 SPIYLSFVML 390 LAALSWQYLS 400 TLSQVTEDYV QTGEH

Gene Ontology

Classification GO ID Description
Cellular Component GO:0005789 endoplasmic reticulum membrane
Molecular Function GO:0055056 D-glucose transmembrane transporter activity
Molecular Function GO:0046872 metal ion binding
Molecular Function GO:0051996 squalene synthase [NAD(P)H] activity
Biological Process GO:0006695 cholesterol biosynthetic process
Biological Process GO:0045338 farnesyl diphosphate metabolic process

Reference

[1] Fan S, Zhou R, Wen H, Ye H, Ma S et al.. Global profiling of protein lactylome in porcine granulosa cells.. J Ovarian Res 18(1):177. 2025 Aug 8. PMID: 40781717.