MetaCyc Compound Class: a cyclodextrin

Synonyms: a cyclomaltodextrin, a Schardinger dextrin

Superclasses: all carbohydrates a carbohydrate a glycan a polysaccharide a glucan a linear alpha-D-glucan a 1,4-alpha-D-glucan
all carbohydrates a carbohydrate a glycan a polysaccharide a glucan a linear alpha-D-glucan a dextrin

Cyclodextrins (cyclomaltodextrins) are cyclic oligosaccharides composed of α-1,4-linked glucose units. Early literature referred to them as Schardinger dextrins. Cyclodextrins corresponding to 6 to 12 or more glucose units have been characterized (in [DePinto68]) (see α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin). The physicochemical properties of cyclodextrins give them broad applications in the food, cosmetic and pharmaceutical industries (in [Hashimoto01]).

α-cyclodextrin ,
β-cyclodextrin ,

Unification Links: KEGG:C00973 , PubChem:439354

Reactions known to consume the compound:

starch degradation III , starch degradation IV :
a cyclodextrin + H2O → a maltodextrin

starch biosynthesis :
ADP-α-D-glucose[chloroplast stroma] + n (1,4-α-D-glucosyl)(n)[chloroplast stroma] → ADP[chloroplast stroma] + n α-amylose[chloroplast stroma]
n a 1,4-α-D-glucan → a (1,6)-α-D-glucosyl-(1,4)-α-glucan highly branched + n H2O

Not in pathways:
a 1,4-α-D-glucan + H2O → a 1,4-α-D-glucan + maltose
a 1,4-α-D-glucan + n H2O → n a 1,4-α-D-glucan
a 1,4-α-D-glucan + n H2O → a 1,4-α-D-glucan + n maltotetraose
a 1,4-α-D-glucan + H2O → a 1,4-α-D-glucan + maltotriose
a 1,4-α-D-glucan + H2O → a 1,4-α-D-glucan + maltohexaose
(1,4-α-D-glucosyl)(n) + H2O → (1,4-α-D-glucosyl)(n-1) + α-D-glucose
a 1,4-α-D-glucan[periplasmic space] + n H2O[periplasmic space]a 1,4-α-D-glucan[periplasmic space] + maltohexaose[periplasmic space]

starch degradation II :
a glucan[chloroplast stroma] + maltotriose[chloroplast stroma]a glucan[chloroplast stroma] + D-glucopyranose[chloroplast stroma]

Not in pathways:
a polysaccharide + H2O → an oligosaccharide

Reactions known to produce the compound:

starch degradation III , starch degradation IV :
starch[extracellular space]a cyclodextrin[extracellular space]

cellulose and hemicellulose degradation (cellulolosome) :
a feruloyl-polysaccharide + H2O → ferulate + a polysaccharide + H+

Not in pathways:
an N-acetyl-β-D-galactosalaminyl-[glycan] + H2O → a glycan + N-acetyl-β-D-galactosamine

Reactions known to both consume and produce the compound:

glycogen biosynthesis I (from ADP-D-Glucose) :
a 1,4-α-D-glucan ↔ a glycogen
ADP-α-D-glucose + (1,4-α-D-glucosyl)(n) ↔ ADP + (1,4-α-D-glucosyl)(n+1)

starch biosynthesis :
ADP-α-D-glucose + (1,4-α-D-glucosyl)(n) ↔ ADP + (1,4-α-D-glucosyl)(n+1)

Not in pathways:
(1,4-α-D-glucosyl)(n) + phosphate ↔ (1,4-α-D-glucosyl)(n-1) + α-D-glucose 1-phosphate

In Reactions of unknown directionality:

Not in pathways:
a 1,4-α-D-glucan = a cyclodextrin

Not in pathways:
n a 1,4-α-D-glucan = n starch + n H2O
sucrose + (1,4-α-D-glucosyl)(n) = D-fructofuranose + (1,4-α-D-glucosyl)(n+1)
(1,4-α-D-glucosyl)(n) = (1,4-α-D-glucosyl)(n-1) + a (1,6)-α-D-glucosyl-(1,4)-α-glucan
a 1,4-α-D-glucan + a 1,4-α-D-glucan = a 1,4-α-D-glucan + a 1,4-α-D-glucan
α-maltose 1-phosphate + (1,4-α-D-glucosyl)(n-1) = (1,4-α-D-glucosyl)(n+1) + phosphate
a nucleoside diphosphate-glucose + a 1,4-α-D-glucan = a nucleoside diphosphate + a 1,4-α-D-glucan
(1,4-α-D-glucosyl)(n) + (1,6-α-D-glucosyl)(m) = (1,4-α-D-glucosyl)(n-1) + (1,6-α-D-glucosyl)(m+1)

Not in pathways:
a linear α-D-glucan + sucrose = an alternan
a linear α-D-glucan = n 1,5-anhydro-D-fructose + β-D-glucose
a linear α-D-glucan + ATP + H2O = [phospho-α-glucan] + AMP + phosphate + 2 H+

Enzymes inhibited by a cyclodextrin, sorted by the type of inhibition, are:

Inhibitor (Mechanism unknown) of: pullulanase [Dong97]

Revised 30-Jan-2012 by Caspi R , SRI International


DePinto68: DePinto JA, Campbell LL (1968). "Purification and properties of the amylase of Bacillus macerans." Biochemistry 7(1);114-20. PMID: 5758537

Dong97: Dong G, Vieille C, Zeikus JG (1997). "Cloning, sequencing, and expression of the gene encoding amylopullulanase from Pyrococcus furiosus and biochemical characterization of the recombinant enzyme." Appl Environ Microbiol 63(9);3577-84. PMID: 9293009

Hashimoto01: Hashimoto Y, Yamamoto T, Fujiwara S, Takagi M, Imanaka T (2001). "Extracellular synthesis, specific recognition, and intracellular degradation of cyclomaltodextrins by the hyperthermophilic archaeon Thermococcus sp. strain B1001." J Bacteriol 183(17);5050-7. PMID: 11489857

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 19.0 on Wed Apr 1, 2015, biocyc13.