Enzymes
| UniProtKB help_outline | 2 proteins |
| Enzyme class help_outline |
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- Name help_outline protodioscin Identifier CHEBI:8588 (CAS: 55056-80-9) help_outline Charge 0 Formula C51H84O22 InChIKeyhelp_outline LVTJOONKWUXEFR-UEZXSUPNSA-N SMILEShelp_outline [H][C@]12C[C@@]3([H])[C@]4([H])CC=C5C[C@H](CC[C@]5(C)[C@@]4([H])CC[C@]3(C)[C@@]1([H])[C@H](C)[C@@](O)(CC[C@@H](C)CO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O)O2)O[C@@H]1O[C@H](CO)[C@@H](O[C@@H]2O[C@@H](C)[C@H](O)[C@@H](O)[C@H]2O)[C@H](O)[C@H]1O[C@@H]1O[C@@H](C)[C@H](O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O Identifier CHEBI:15377 (CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,264 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 26-deglucoprotodioscin Identifier CHEBI:74026 Charge 0 Formula C45H74O17 InChIKeyhelp_outline HTURSHLCTQHPMM-ZGXDEBHDSA-N SMILEShelp_outline [H][C@]12C[C@@]3([H])[C@]4([H])CC=C5C[C@H](CC[C@]5(C)[C@@]4([H])CC[C@]3(C)[C@@]1([H])[C@H](C)[C@@](O)(CC[C@@H](C)CO)O2)O[C@@H]1O[C@H](CO)[C@@H](O[C@@H]2O[C@@H](C)[C@H](O)[C@@H](O)[C@H]2O)[C@H](O)[C@H]1O[C@@H]1O[C@@H](C)[C@H](O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline D-glucose Identifier CHEBI:4167 (CAS: 2280-44-6) help_outline Charge 0 Formula C6H12O6 InChIKeyhelp_outline WQZGKKKJIJFFOK-GASJEMHNSA-N SMILEShelp_outline OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 162 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:37895 | RHEA:37896 | RHEA:37897 | RHEA:37898 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Furostanol glycoside 26-O-beta-glucosidase from the leaves of Solanum torvum.
Arthan D., Kittakoop P., Esen A., Svasti J.
A beta-glucosidase (torvosidase) was purified to homogeneity from the young leaves of Solanum torvum. The enzyme was highly specific for cleavage of the glucose unit attached to the C-26 hydroxyl of furostanol glycosides from the same plant, namely torvosides A and H. Purified torvosidase is a mon ... >> More
A beta-glucosidase (torvosidase) was purified to homogeneity from the young leaves of Solanum torvum. The enzyme was highly specific for cleavage of the glucose unit attached to the C-26 hydroxyl of furostanol glycosides from the same plant, namely torvosides A and H. Purified torvosidase is a monomeric glycoprotein, with a native molecular weight of 87 kDa by gel filtration and a pI of 8.8 by native agarose IEF. Optimum pH of the enzyme for p-nitrophenyl-beta-glucoside and torvoside H was 5.0. Kinetic studies showed that Km values for torvoside A (0.06 3mM) and torvoside H (0.068 mM) were much lower than those for synthetic substrates, pNP-beta-glucoside (1.03 mM) and 4-methylumbelliferyl-beta-glucoside (0.78 mM). The enzyme showed strict specificity for the beta-d-glucosyl bond when tested for glycone specificity. Torvosidase hydrolyses only torvosides and dalcochinin-8'-beta-glucoside, which is the natural substrate of Thai rosewood beta-glucosidase, but does not hydrolyse other natural substrates of the GH1 beta-glucosidases or of the GH3 beta-glucosidase families. Torvosidase also hydrolyses C5-C10 alkyl-beta-glucosides, with a rate of hydrolysis increasing with longer alkyl chain length. The internal peptide sequence of Solanum beta-glucosidase shows high similarity to the sequences of family GH3 glycosyl hydrolases. << Less
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Purification and characterization of furostanol glycoside 26-O-beta-glucosidase from Costus speciosus rhizomes.
Inoue K., Ebizuka Y.
In plants, spirostanol glycosides (steroid saponins) are known to be formed furostanol glycosides during postharvest treatment and storage. Furostanol glycoside 26-O-beta-glucosidase (F26G) involved in this conversion was purified to apparent homogeneity for the first time from Costus speciosus rh ... >> More
In plants, spirostanol glycosides (steroid saponins) are known to be formed furostanol glycosides during postharvest treatment and storage. Furostanol glycoside 26-O-beta-glucosidase (F26G) involved in this conversion was purified to apparent homogeneity for the first time from Costus speciosus rhizomes which accumulate these glycosides. The enzyme was highly specific for cleavage of the C-26-boudn glucose moiety of furostanol glycosides showing Km for protogracillin of 50 microM. Glucono-1,5-lactone, a typical beta-glucosidase inhibitor, and diosgenin, an aglycone of spirostanol glycosides, strongly inhibited the enzyme activity. The purified F26G is dimeric with a native apparent molecular weight of 110,000 consisting of subunits of 54,000 and 58,000. The N-terminal sequence of the 54,000 protein has a high similarity to the sequences found in N-terminal regions of known plant beta-glucosidases. << Less