Enzymes
| UniProtKB help_outline | 4,260 proteins |
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- Name help_outline α-D-galactosyl-(1→3)-1D-myo-inositol Identifier CHEBI:17505 (CAS: 3687-64-7) help_outline Charge 0 Formula C12H22O11 InChIKeyhelp_outline VCWMRQDBPZKXKG-DXNLKLAMSA-N SMILEShelp_outline OC[C@H]1O[C@H](O[C@H]2[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)[C@@H]2O)[C@H](O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline sucrose Identifier CHEBI:17992 (CAS: 57-50-1) help_outline Charge 0 Formula C12H22O11 InChIKeyhelp_outline CZMRCDWAGMRECN-UGDNZRGBSA-N SMILEShelp_outline OC[C@H]1O[C@H](O[C@]2(CO)O[C@H](CO)[C@@H](O)[C@@H]2O)[C@H](O)[C@@H](O)[C@@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 27 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline raffinose Identifier CHEBI:16634 (CAS: 512-69-6) help_outline Charge 0 Formula C18H32O16 InChIKeyhelp_outline MUPFEKGTMRGPLJ-ZQSKZDJDSA-N SMILEShelp_outline OC[C@H]1O[C@H](OC[C@H]2O[C@H](O[C@]3(CO)O[C@H](CO)[C@@H](O)[C@@H]3O)[C@H](O)[C@@H](O)[C@@H]2O)[C@H](O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 5 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline myo-inositol Identifier CHEBI:17268 (CAS: 87-89-8) help_outline Charge 0 Formula C6H12O6 InChIKeyhelp_outline CDAISMWEOUEBRE-GPIVLXJGSA-N SMILEShelp_outline O[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@H](O)[C@@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 25 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:20161 | RHEA:20162 | RHEA:20163 | RHEA:20164 | |
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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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Functional expression of a cDNA encoding pea (Pisum sativum L.) raffinose synthase, partial purification of the enzyme from maturing seeds, and steady-state kinetic analysis of raffinose synthesis.
Peterbauer T., Mach L., Mucha J., Richter A.
Raffinose (O-alpha- D-galactopyranosyl-(1-->6)- O-alpha-D-glucopyranosyl-(1<-->2)- O-beta-D-fructofuranoside) is a widespread oligosaccharide in plant seeds and other tissues. Raffinose synthase (EC 2.4.1.82) is the key enzyme that channels sucrose into the raffinose oligosaccharide pathway. We he ... >> More
Raffinose (O-alpha- D-galactopyranosyl-(1-->6)- O-alpha-D-glucopyranosyl-(1<-->2)- O-beta-D-fructofuranoside) is a widespread oligosaccharide in plant seeds and other tissues. Raffinose synthase (EC 2.4.1.82) is the key enzyme that channels sucrose into the raffinose oligosaccharide pathway. We here report on the isolation of a cDNA encoding for raffinose synthase from maturing pea ( Pisum sativum L.) seeds. The coding region of the cDNA was expressed in Spodoptera frugiperda Sf21 insect cells. The recombinant enzyme, a protein of glycoside hydrolase family 36, displayed similar kinetic properties to raffinose synthase partially purified from maturing seeds by anion-exchange and size-exclusion chromatography. Apart from the natural galactosyl donor galactinol ( O-alpha-D-galactopyranosyl-(1-->1)- L- myo-inositol), p-nitrophenyl alpha-D-galactopyranoside, an artificial substrate, was utilized as a galactosyl donor. An equilibrium constant of 4.1 was determined for the galactosyl transfer reaction from galactinol to sucrose. Steady-state kinetic analysis suggested that raffinose synthase is a transglycosidase operating by a ping-pong reaction mechanism and may also act as a glycoside hydrolase. The enzyme was strongly inhibited by 1-deoxygalactonojirimycin, a potent inhibitor for alpha-galactosidases (EC 3.2.1.22). The physiological implications of these observations are discussed. << Less
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Characterization of raffinose synthase from rice (Oryza sativa L. var. Nipponbare).
Li S., Li T., Kim W.-D., Kitaoka M., Yoshida S., Nakajima M., Kobayashi H.
The putative raffinose synthase gene from rice was cloned and expressed in Escherichia coli. The enzyme displayed an optimum activity at 45 degrees C and pH 7.0, and a sulfhydryl group was required for its activity. The enzyme was specific for galactinol and p-nitrophenyl-alpha-D-galactoside as ga ... >> More
The putative raffinose synthase gene from rice was cloned and expressed in Escherichia coli. The enzyme displayed an optimum activity at 45 degrees C and pH 7.0, and a sulfhydryl group was required for its activity. The enzyme was specific for galactinol and p-nitrophenyl-alpha-D-galactoside as galactosyl donors, and sucrose, lactose, 4-beta-galactobiose, N-acetyl-D-lactosamine, trehalose and lacto-N-biose were recognized as galactosyl acceptors. << Less