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Isomaltose O-IMO2
Product code: O-IMO2

200 mg

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Content: 200 mg
Shipping Temperature: Ambient
Storage Temperature: Ambient
Physical Form: Powder
Stability: > 10 years under recommended storage conditions
CAS Number: 499-40-1
Molecular Formula: C12H22O11
Molecular Weight: 342.3
Purity: > 99% 
Substrate For (Enzyme): endo-1,6-α-Dextrinase, oligo-1,6-α-Glucosidase, α-Glucosidase

High purity isomaltose for use in research, biochemical enzyme assays and in vitro diagnostic analysis.

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Data Sheet

The influence of α-1, 4-glucan substrates on 4, 6-α-D-glucanotransferase reaction dynamics during isomalto/malto-polysaccharide synthesis.

Klostermann, C. E., van der Zaal, P. H., Schols, H. A., Buwalda, P. L. & Bitter, J. H. (2021). International Journal of Biological Macromolecules, 181, 762-768.

Starch-based isomalto/malto-polysaccharides (IMMPs) are soluble dietary fibres produced by the incubation of α-(1 → 4) linked glucans with the 4,6-α-glucanotransferase (GTFB) enzyme. In this study, we investigated the reaction dynamics of the GTFB enzyme by using isoamylase debranched starches as simplified linear substrates. Modification of α-glucans by GTFB was investigated over time and analysed with 1H NMR, HPSEC, HPAEC combined with glucose release measurements. We demonstrate that GTFB modification of linear substrates followed a substrate/acceptor model, in which α-(1 → 4) linked glucans DP ≥ 6 functioned as donor substrate, and α-(1 → 4) linked malto-oligomers DP < 6 functioned as acceptor. The presence of α-(1 → 4) linked malto-oligomers DP < 6 resulted in higher GTFB transferase activity, while their absence resulted in higher GTFB hydrolytic activity. The information obtained in this study provides a better insight into GTFB reaction dynamics and will be useful for α-glucan selection for the targeted synthesis of IMMPs in the future.

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Sequence analysis and biochemical properties of an acidophilic and hyperthermophilic amylopullulanase from Thermofilum pendens.

Li, X., Zhao, J., Fu, J., Pan, Y., & Li, D. (2018). International Journal of Biological Macromolecules, 114, 235-243.

The acidophilic and thermophilic pullulanases have many potential applications in the processes of starch liquefaction and saccharification. In this study, a gene encoding an amylopullulanase from Thermofilum pendens (TPApu) was heterologously expressed in Escherichia coli. Although TPApu possessed the same continuous GH57N_Apu domain and the succeeding α-helical region as other two amylopullulanases from Staphylothermus marinus (SMApu) and Caldivirga maquilingensis (CMApu), it only showed maximal amino acid identities of 25.7-28.7% with CMApu and SMApu. The purified TPApu appeared as a single band of SDS-PAGE with a molecular mass of 65.5 kDa and exhibited the maximal activity at pH 3.5 and 95-100°C. TPApu had the highest catalytic efficiency towards pullulan (kcat/km, 8.79 s-1 mL mg-1) and α-cyclodextrin (kcat/km, 0.36 s-1  mM-1). In the initial stages, the ring-opening reactions of γ-cyclodextrin, 6-O-glucosyl-β-cyclodextrin, 6-O-maltosyl-β-cyclodextrin and the debranching reactions of 6-O-maltooctaosyl-β-cyclodextrin were firstly catalyzed. In the subsequent reactions, a serial of maltooligosaccharides were produced. As the most acidophilic amylopullulanase among thermophilic pullulanases reported to date, TPApu preferred to debranch the DP6-12 side chains of amylopectin at pH 4.5 and 100°C.

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Safety Information
Symbol : Not Applicable
Signal Word : Not Applicable
Hazard Statements : Not Applicable
Precautionary Statements : Not Applicable
Safety Data Sheet
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