Enzymes
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- Name help_outline α-D-glucose 1-phosphate Identifier CHEBI:58601 Charge -2 Formula C6H11O9P InChIKeyhelp_outline HXXFSFRBOHSIMQ-VFUOTHLCSA-L SMILEShelp_outline OC[C@H]1O[C@H](OP([O-])([O-])=O)[C@H](O)[C@@H](O)[C@@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 41 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 6,337 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline D-maltose Identifier CHEBI:17306 (CAS: 69-79-4) help_outline Charge 0 Formula C12H22O11 InChIKeyhelp_outline GUBGYTABKSRVRQ-PICCSMPSSA-N SMILEShelp_outline OC[C@H]1O[C@H](O[C@@H]2[C@@H](CO)OC(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 18 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline phosphate Identifier CHEBI:43474 Charge -2 Formula HO4P InChIKeyhelp_outline NBIIXXVUZAFLBC-UHFFFAOYSA-L SMILEShelp_outline OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 1,020 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:22320 | RHEA:22321 | RHEA:22322 | RHEA:22323 | |
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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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Characterization of maltose biosynthesis from alpha-D-glucose-1-phosphate in Spinacia oleracea. L.
Schilling N.
The de novo synthesis of maltose in spinach (Spinacia oleracea L.) was shown to be catalyzed by a maltose synthase, which converts two molecules of α-D-glucose-1-phosphate (α-G1P) (Km 1.5 mmol l(-1)) to maltose and 2 orthophosphate (Pi). This enzyme was purified 203-fold by fractionated ammonium s ... >> More
The de novo synthesis of maltose in spinach (Spinacia oleracea L.) was shown to be catalyzed by a maltose synthase, which converts two molecules of α-D-glucose-1-phosphate (α-G1P) (Km 1.5 mmol l(-1)) to maltose and 2 orthophosphate (Pi). This enzyme was purified 203-fold by fractionated ammonium sulfate precipitation and by column chromatography on Sepharose 6B. The addition of α-G1P (15 mmol l(-1)) to the isolation buffer is required to stabilize the enzyme activity during the extraction and purification procedure. Molecular weight determination by gel filtration yielded a value of 95,000. δ-Gluconolactone, ATP and Pi are competitive inhibitors toward the substrate α-G1P. The maltose synthase catalyzes an exchange of the phosphate group of α-G1P with [(32)P] orthophosphate; this transfer reaction suggests that the synthesis of maltose occurs via a glucose-enzyme in a double displacement reaction. The physiological role of this enzyme as a "starch initiator system" is discussed. << Less