Escherichia coli K-12 substr. MG1655 Compound Class: maltose

Synonyms: α-D-glucopyranose-(1→4)-D-glucopyranose, maltose

Superclasses: all carbohydratesa carbohydratea glycanan oligosaccharidea disaccharide
all carbohydratesa carbohydratea glycanan oligosaccharidea malto-oligosaccharidea linear malto-oligosaccharide

Maltose is composed of two glucose molecules linked by an α 1,4-glycosidic linkage. Maltose is produced by the hydrolysis of starch and similar compounds, and can be hydrolyzed to glucose by the enzyme maltase.

maltose compound structure

Glycan icon:

maltose compound structure

Chemical Formula: C12H22O11

Citations: [Stryer88]

Molecular Weight: 342.3 Daltons

Monoisotopic Molecular Weight: 342.11621154930003 Daltons


InChI: InChI=1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5-,6+,7-,8-,9-,10-,11?,12-/m1/s1


Unification Links: CAS:69-79-4, ChEBI:17306, ChemSpider:6019

Standard Gibbs Free Energy of Change Formation (ΔfG in kcal/mol): -363.9 [Forsythe97]

Reactions known to consume the compound:

glycogen degradation I :
maltotetraose + D-glucopyranose ← maltotriose + maltose

Reactions known to produce the compound:

glycogen degradation I :
maltotriose + H2O → maltose + D-glucopyranose

In Reactions of unknown directionality:

Not in pathways:
maltopentaose + D-glucopyranose = maltotetraose + maltose
maltohexaose + D-glucopyranose = maltopentaose + maltose
maltose + maltohexaose = maltoheptaose + D-glucopyranose
maltose + acetyl-CoA = 6-O-acetyl-α-D-glucopyranosyl-(1→4)-D-glucose + coenzyme A

In Transport reactions:
maltose[extracellular space]maltose[periplasm],
maltose[periplasm] + ATP + H2O → maltose[cytosol] + ADP + phosphate + H+,

This compound has been characterized as an alternative substrate of the following enzymes: aldose sugar dehydrogenase, maltodextrin glucosidase

In Growth Media: PMA carbon source test + maltose


Forsythe97: Forsythe RG, Karp PD, Mavrovouniotis ML (1997). "Estimation of Equilibrium Constants Using Automated Group Contribution Methods." CABIOS 13(5):537-543.

Stryer88: Stryer L "Biochemistry." WH Freeman and Co., 3rd edition, New York, 1988.

Zeeman10: Zeeman SC, Kossmann J, Smith AM (2010). "Starch: its metabolism, evolution, and biotechnological modification in plants." Annu Rev Plant Biol 61;209-34. PMID: 20192737

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Please cite the following article in publications resulting from the use of EcoCyc: Nucleic Acids Research 41:D605-12 2013
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