Oxidosqualene cyclase converting oxidosqualene to cycloartenol. Required for the production of sterols. Glycyrrhiza glabra (taxid: 49827) EC: 5EC: .EC: 4EC: .EC: 9EC: 9EC: .EC: 8
Oxidosqualene cyclase involved in the biosynthesis of the highly oxygenated tetracyclic triterpenes cucurbitacins. Converts oxidosqualene to cucurbitadienol and does not produce lanosterol.
Cucurbita pepo (taxid: 3663)
EC: 5
EC: .
EC: 4
EC: .
EC: 9
EC: 9
EC: .
EC: 3
EC: 3
>sp|Q2XPU6|CAS1_RICCO Cycloartenol synthase OS=Ricinus communis PE=1 SV=1
>gnl|CDD|239222 cd02892, SQCY_1, Squalene cyclase (SQCY) domain subgroup 1; found in class II terpene cyclases that have an alpha 6 - alpha 6 barrel fold
Score = 140 bits (355), Expect = 9e-41
Identities = 49/80 (61%), Positives = 56/80 (70%)
Query: 1 VLGVYEWSGNNPLPPEIWLLPYFLPFHPGRMWCHCRMVYLPMSYLYGTRFVGPFNSLILS 60
+LGVY W G PLPPE+WLLP +LPFHP + WC R VY+PMSYLYG R V P L+LS
Sbjct: 123 LLGVYPWEGVPPLPPELWLLPSWLPFHPYKFWCWARTVYVPMSYLYGKRPVAPITPLVLS 182
Query: 61 LRKELYTLPYHYIDWDHARN 80
LR ELY PY I+W RN
Sbjct: 183 LRDELYVEPYEKINWYKHRN 202
Squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY) are integral membrane proteins that catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. This group contains bacterial SQCY which catalyzes the convertion of squalene to hopene or diplopterol and eukaryotic OSQCY which transforms the 2,3-epoxide of squalene to compounds such as, lanosterol in mammals and fungi or, cycloartenol in plants. Deletion of a single glycine residue of Alicyclobacillus acidocaldarius SQCY alters its substrate specificity into that of eukaryotic OSQCY. Both enzymes have a second minor domain, which forms an alpha-alpha barrel that is inserted into the major domain. Length = 634
Score = 106 bits (265), Expect = 2e-28
Identities = 43/79 (54%), Positives = 53/79 (67%)
Query: 1 VLGVYEWSGNNPLPPEIWLLPYFLPFHPGRMWCHCRMVYLPMSYLYGTRFVGPFNSLILS 60
+LG+Y G P+PPE+WLLP LPFHP R +CH RMVYLPMS+LYG R P L +
Sbjct: 120 LLGLYGRGGLQPVPPELWLLPESLPFHPSRFYCHTRMVYLPMSWLYGRRARAPLTPLRAA 179
Query: 61 LRKELYTLPYHYIDWDHAR 79
LR+ELY Y +D+ AR
Sbjct: 180 LRQELYDGGYGQVDFVAAR 198
This model identifies 2,3-oxidosqualene cyclases from Stigmatella aurantiaca which produces cycloartenol , and Gemmata obscuriglobus and Methylococcus capsulatus which each produce the closely related sterol, lanosterol. Length = 634
This family of enzymes catalyzes the cyclization of the triterpenes squalene or 2-3-oxidosqualene to a variety of products including hopene , lanosterol , cycloartenol, amyrin, lupeol and isomultiflorenol. Length = 621
This model identifies 2,3-oxidosqualene cyclases from Stigmatella aurantiaca which produces cycloartenol, and Gemmata obscuriglobus and Methylococcus capsulatus which each produce the closely related sterol, lanosterol.
>KOG0497 consensus Oxidosqualene-lanosterol cyclase and related proteins [Lipid transport and metabolism]
Squalene cyclase (SQCY) and 2,3-oxidosqualene cyclase (OSQCY) are integral membrane proteins that catalyze a cationic cyclization cascade converting linear triterpenes to fused ring compounds. This group contains bacterial SQCY which catalyzes the convertion of squalene to hopene or diplopterol and eukaryotic OSQCY which transforms the 2,3-epoxide of squalene to compounds such as, lanosterol in mammals and fungi or, cycloartenol in plants. Deletion of a single glycine residue of Alicyclobacillus acidocaldarius SQCY alters its substrate specificity into that of eukaryotic OSQCY. Both enzymes have a second minor domain, which forms an alpha-alpha barrel that is inserted into the major domain.
SHC is an essential prokaryotic gene in hopanoid (triterpenoid) biosynthesis. Squalene hopene cyclase, an integral membrane protein, directly cyclizes squalene into hopanoid products.
This family of enzymes catalyzes the cyclization of the triterpenes squalene or 2-3-oxidosqualene to a variety of products including hopene, lanosterol, cycloartenol, amyrin, lupeol and isomultiflorenol.
Score = 101 bits (251), Expect = 6e-27
Identities = 42/82 (51%), Positives = 49/82 (59%)
Query: 2 LGVYEWSGNNPLPPEIWLLPYFLPFHPGRMWCHCRMVYLPMSYLYGTRFVGPFNSLILSL 61
L VY W G N L PE+WL P + P HP +WCHCR VYLPMSY Y R + L+ SL
Sbjct: 200 LNVYSWEGLNTLFPEMWLFPDWAPAHPSTLWCHCRQVYLPMSYCYAVRLSAAEDPLVQSL 259
Query: 62 RKELYTLPYHYIDWDHARNLCA 83
R+ELY + IDW RN A
Sbjct: 260 RQELYVEDFASIDWLAQRNNVA 281
Score = 106 bits (267), Expect = 1e-30
Identities = 43/84 (51%), Positives = 50/84 (59%)
Query: 1 VLGVYEWSGNNPLPPEIWLLPYFLPFHPGRMWCHCRMVYLPMSYLYGTRFVGPFNSLILS 60
VL VY W G N L PE+WL P + P HP +WCHCR VYLPMSY Y R + L+ S
Sbjct: 100 VLNVYSWEGLNTLFPEMWLFPDWAPAHPSTLWCHCRQVYLPMSYCYAVRLSAAEDPLVQS 159
Query: 61 LRKELYTLPYHYIDWDHARNLCAK 84
LR+ELY + IDW RN A
Sbjct: 160 LRQELYVEDFASIDWLAQRNNVAP 183
