Enzymes A-Z
Complete database of 6965 enzymes with EC numbers, catalytic activities, alternative names, and UniProt cross-references. Browse by EC class or search for specific enzymes.
Enzymes A-Z
Complete database of 6965 enzymes with EC numbers, catalytic activities, alternative names, and UniProt cross-references. Browse by EC class or search for specific enzymes.
spermidine synthase (EC 2.5.1.16)
spermidine synthase. EC 2.5.1.16.. S-adenosyl 3-(methylsulfanyl)propylamine + putrescine = S-methyl-
spermidine--8-amino-7-oxononanoate transaminase (EC 2.6.1.127)
spermidine--8-amino-7-oxononanoate transaminase. EC 2.6.1.127.. (8S)-8-amino-7-oxononanoate + spermidine = N-(3-aminopropyl)-4-
spermine oxidase (EC 1.5.3.16)
spermine oxidase. EC 1.5.3.16.. spermine + O2 + H2O = 3-aminopropanal + spermidine + H2O2.
spermine synthase (EC 2.5.1.22)
spermine synthase. EC 2.5.1.22.. S-adenosyl 3-(methylsulfanyl)propylamine + spermidine = spermine +
spermosin (EC 3.4.21.99)
spermosin. EC 3.4.21.99.. Hydrolyzes arginyl bonds, preferably with Pro in the P2 position.
spheroidene monooxygenase (EC 1.14.15.9)
spheroidene monooxygenase. EC 1.14.15.9.. (1) spheroidene + 4 reduced [2Fe-2S]-[ferredoxin] + 2 O2 + 4 H(+) =
sphinganine-1-phosphate aldolase (EC 4.1.2.27)
sphinganine-1-phosphate aldolase. EC 4.1.2.27.. sphinganine 1-phosphate = hexadecanal + phosphoethanolamine.
sphingoid base N-palmitoyltransferase (EC 2.3.1.291)
sphingoid base N-palmitoyltransferase. EC 2.3.1.291.. a sphingoid base + hexadecanoyl-CoA = an N-hexadecanoyl-sphingoid base +
sphingoid base N-stearoyltransferase (EC 2.3.1.299)
sphingoid base N-stearoyltransferase. EC 2.3.1.299.. a sphingoid base + octadecanoyl-CoA = an N-octadecanoyl-sphingoid base +
sphingolipid 10-desaturase (EC 1.14.19.19)
sphingolipid 10-desaturase. EC 1.14.19.19.. a (4E,8E)-4-sphinga-4,8-dienine ceramide + 2 Fe(II)-[cytochrome b5] +
sphingolipid 4-desaturase (EC 1.14.19.17)
sphingolipid 4-desaturase. EC 1.14.19.17.. an N-acylsphinganine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) =
sphingolipid 8-(E)-desaturase (EC 1.14.19.18)
sphingolipid 8-(E)-desaturase. EC 1.14.19.18.. an N-acylsphing-4-enine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) =
sphingolipid 8-(E/Z)-desaturase (EC 1.14.19.29)
sphingolipid 8-(E/Z)-desaturase. EC 1.14.19.29.. (1) an N-acyl-(4R)-4-hydroxysphinganine + 2 Fe(II)-[cytochrome b5] + O2 +
sphingolipid C(9)-methyltransferase (EC 2.1.1.317)
sphingolipid C(9)-methyltransferase. EC 2.1.1.317.. a (4E,8E)-4-sphinga-4,8-dienine ceramide + S-adenosyl-L-methionine =
sphingolipid C4-monooxygenase (EC 1.14.18.5)
sphingolipid C4-monooxygenase. EC 1.14.18.5.. a dihydroceramide + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) =
sphingomyelin deacylase (EC 3.5.1.109)
sphingomyelin deacylase. EC 3.5.1.109.. (1) a sphingomyelin + H2O = sphing-4-enine-phosphocholine +
sphingomyelin phosphodiesterase (EC 3.1.4.12)
sphingomyelin phosphodiesterase. EC 3.1.4.12.. a sphingomyelin + H2O = phosphocholine + an N-acylsphing-4-enine + H(+).
sphingomyelin phosphodiesterase D (EC 3.1.4.41)
sphingomyelin phosphodiesterase D. EC 3.1.4.41.. a sphingomyelin + H2O = an N-acylsphing-4-enine 1-phosphate + choline +
sphingomyelin synthase (EC 2.7.8.27)
sphingomyelin synthase. EC 2.7.8.27.. an N-acylsphing-4-enine + a 1,2-diacyl-sn-glycero-3-phosphocholine =
sphingosine beta-galactosyltransferase (EC 2.4.1.23)
sphingosine beta-galactosyltransferase. EC 2.4.1.23.. sphing-4-enine + UDP-alpha-D-galactose = beta-D-galactosyl-(1<->1)-
sphingosine cholinephosphotransferase (EC 2.7.8.10)
sphingosine cholinephosphotransferase. EC 2.7.8.10.. CDP-choline + sphing-4-enine = sphing-4-enine-phosphocholine + CMP +
sphingosine kinase (EC 2.7.1.91)
sphingosine kinase. EC 2.7.1.91.. a sphingoid base + ATP = a sphingoid 1-phosphate + ADP + H(+).
sphingosine N-acyltransferase (EC 2.3.1.24)
sphingosine N-acyltransferase. EC 2.3.1.24.. sphing-4-enine + a fatty acyl-CoA = an N-acylsphing-4-enine + CoA + H(+).
spleen exonuclease (EC 3.1.16.1)
spleen exonuclease. EC 3.1.16.1.. Exonucleolytic cleavage in the 5'- to 3'-direction to yield nucleoside
SpoIVB peptidase (EC 3.4.21.116)
SpoIVB peptidase. EC 3.4.21.116.. Self-cleaves 52-Val-|-Asn-53, 62-Ala-|-Phe-63 and 74-Val-|-Thr-75 at the
spore photoproduct lyase (EC 4.1.99.14)
spore photoproduct lyase. EC 4.1.99.14.. (5R)-5,6-dihydro-5-(thymidin-7-yl)thymidine in DNA = a thymidine dimer in
sporulenol synthase (EC 4.2.1.137)
sporulenol synthase. EC 4.2.1.137.. sporulenol = (R)-tetraprenyl-beta-curcumene + H2O.
squalene methyltransferase (EC 2.1.1.262)
squalene methyltransferase. EC 2.1.1.262.. squalene + 2 S-adenosyl-L-methionine = 3,22-dimethyl-1,2,23,24-
squalene monooxygenase (EC 1.14.14.17)
squalene monooxygenase. EC 1.14.14.17.. squalene + reduced [NADPH--hemoprotein reductase] + O2 = (S)-2,3-
squalene synthase (EC 2.5.1.21)
squalene synthase. EC 2.5.1.21.. (1) 2 (2E,6E)-farnesyl diphosphate + NADPH + H(+) = squalene +
squalene--hopanol cyclase (EC 4.2.1.129)
squalene--hopanol cyclase. EC 4.2.1.129.. squalene + H2O = hopan-22-ol.
squalene--hopene cyclase (EC 5.4.99.17)
squalene--hopene cyclase. EC 5.4.99.17.. squalene = hop-22(29)-ene.
stachydrine N-demethylase (EC 1.14.13.247)
stachydrine N-demethylase. EC 1.14.13.247.. (1) L-proline betaine + NADPH + O2 + H(+) = N-methyl-L-proline +
staphopain (EC 3.4.22.48)
staphopain. EC 3.4.22.48.. Broad endopeptidase action on proteins including elastin, but rather
staphyloferrin A synthase (EC 6.3.2.57)
staphyloferrin A synthase. EC 6.3.2.57.. N(5)-[(S)-citryl]-D-ornithine + citrate + ATP = staphyloferrin A + AMP +
staphyloferrin B synthase (EC 6.3.2.56)
staphyloferrin B synthase. EC 6.3.2.56.. 2-[(L-alanin-3-ylcarbamoyl)methyl]-3-(2-aminoethylcarbamoyl)-2-
staphylopine dehydrogenase (EC 1.5.1.52)
staphylopine dehydrogenase. EC 1.5.1.52.. staphylopine + NADP(+) + H2O = (2S)-2-amino-4-{[(1R)-1-carboxy-2-
starch synthase (EC 2.4.1.21)
starch synthase. EC 2.4.1.21.. [(1->4)-alpha-D-glucosyl](n) + ADP-alpha-D-glucose = [(1->4)-alpha-D-
starch synthase (maltosyl-transferring) (EC 2.4.99.16)
starch synthase (maltosyl-transferring). EC 2.4.99.16.. alpha-maltose 1-phosphate + [(1->4)-alpha-D-glucosyl](n) = [(1->4)-alpha-
Ste24 endopeptidase (EC 3.4.24.84)
Ste24 endopeptidase. EC 3.4.24.84.. Hydrolyzes the peptide bond -P2-(S-farnesyl or
stearoyl-[acyl-carrier-protein] 9-desaturase (EC 1.14.19.2)
stearoyl-[acyl-carrier-protein] 9-desaturase. EC 1.14.19.2.. octadecanoyl-[ACP] + 2 reduced [2Fe-2S]-[ferredoxin] + O2 + 2 H(+) =
stearoyl-CoA 9-desaturase (EC 1.14.19.1)
stearoyl-CoA 9-desaturase. EC 1.14.19.1.. octadecanoyl-CoA + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) = (9Z)-
stearoyl-CoA 9-desaturase (NADPH) (EC 1.14.19.n4)
stearoyl-CoA 9-desaturase (NADPH). EC 1.14.19.n4.. octadecanoyl-CoA + NADPH + O2 + H(+) = (9Z)-octadecenoyl-CoA + NADP(+) +
stellata-2,6,19-triene synthase (EC 4.2.3.178)
stellata-2,6,19-triene synthase. EC 4.2.3.178.. (2E,6E,10E,14E)-geranylfarnesyl diphosphate = stellata-2,6,19-triene +
stem bromelain (EC 3.4.22.32)
stem bromelain. EC 3.4.22.32.. Broad specificity for cleavage of proteins, but strong preference for
stemar-13-ene synthase (EC 4.2.3.33)
stemar-13-ene synthase. EC 4.2.3.33.. 9alpha-copalyl diphosphate = stemar-13-ene + diphosphate.
stemmadenine O-acetyltransferase (EC 2.3.1.323)
stemmadenine O-acetyltransferase. EC 2.3.1.323.. 15alpha-stemmadenine + acetyl-CoA = O-acetyl-15alpha-stemmadenine + CoA.
stemod-13(17)-ene synthase (EC 4.2.3.34)
stemod-13(17)-ene synthase. EC 4.2.3.34.. 9alpha-copalyl diphosphate = stemod-13(17)-ene + diphosphate.
sterigmatocystin 8-O-methyltransferase (EC 2.1.1.110)
sterigmatocystin 8-O-methyltransferase. EC 2.1.1.110.. (1) sterigmatocystin + S-adenosyl-L-methionine = 8-O-
steroid 11beta-monooxygenase (EC 1.14.15.4)
steroid 11beta-monooxygenase. EC 1.14.15.4.. a steroid + 2 reduced [adrenodoxin] + O2 + 2 H(+) = an 11beta-
steroid 15beta-monooxygenase (EC 1.14.15.8)
steroid 15beta-monooxygenase. EC 1.14.15.8.. reduced 2[4Fe-4S]-[ferredoxin] + progesterone + O2 + 2 H(+) = 15beta-
steroid 17alpha-monooxygenase (EC 1.14.14.19)
steroid 17alpha-monooxygenase. EC 1.14.14.19.. a C21-steroid + reduced [NADPH--hemoprotein reductase] + O2 = a 17alpha-
steroid 21-monooxygenase (EC 1.14.14.16)
steroid 21-monooxygenase. EC 1.14.14.16.. (1) progesterone + reduced [NADPH--hemoprotein reductase] + O2 =
steroid 22S-hydroxylase (EC 1.14.14.178)
steroid 22S-hydroxylase. EC 1.14.14.178.. (1) a C27-steroid + reduced [NADPH--hemoprotein reductase] + O2 =
steroid 9alpha-monooxygenase (EC 1.14.99.24)
steroid 9alpha-monooxygenase. EC 1.14.99.24.. pregna-4,9(11)-diene-3,20-dione + AH2 + O2 = 9,11alpha-epoxypregn-4-ene-
steroid C-25 hydroxylase (EC 1.17.99.10)
steroid C-25 hydroxylase. EC 1.17.99.10.. cholest-4-en-3-one + A + H2O = 25-hydroxycholest-4-en-3-one + AH2.
steroid Delta-isomerase (EC 5.3.3.1)
steroid Delta-isomerase. EC 5.3.3.1.. a 3-oxo-Delta(5)-steroid = a 3-oxo-Delta(4)-steroid.
steroid N-acetylglucosaminyltransferase (EC 2.4.1.39)
steroid N-acetylglucosaminyltransferase. EC 2.4.1.39.. 17alpha-estradiol 3-O-(beta-D-glucuronate) + UDP-N-acetyl-alpha-D-
steroid sulfotransferase (EC 2.8.2.15)
steroid sulfotransferase. EC 2.8.2.15.. a phenolic steroid + 3'-phosphoadenylyl sulfate = a phenolic steroid 3-O-
steroid-lactonase (EC 3.1.1.37)
steroid-lactonase. EC 3.1.1.37.. testololactone + H2O = testolate + H(+).