The Cyclization Mechanism of Cyclodextrin Glycosyltransferase (CGTase) as Revealed by a γ-Cyclodextrin-CGTase Complex at Å. Cyclodextrin glycosyltransferase is an important enzyme of cyclodextrin synthesis . This article mainly discusses the recent progress of the application of. INDUSTRIAL MICROBIOLOGY. Cyclodextrin glycosyltransferase from Bacillus licheniformis: optimization of production and its properties. Cyclodextrina.

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Colorimetric determination of b -cyclodextrin: Thus Phe stimulates the use of cycldextrin circularized sugar chain as the acceptor instead of a free sugar.

It can be judged from the experimentally determined atomic B-factors.

Cyclodextrin glycosyltransferase – Wikipedia

In addition, the electron density and hydrogen bond network suggest that the imizadole ring of His is flipped. An especially interesting and gllycosyltransferase family 13 enzyme is cyclodextrin glycosyltransferase CGTase. Industrial potential of cyclodextrin glycosyl transferases. After the migration in the polyacrylamide gel, the CGTase activity was identified through the halo formation next to front Fig. Cyclodextrin glycosyltransferase from Bacillus licheniformis: J Bioequiv Availab 3: October 12, ; Published Date: All these loops are intimately connected through various interactions.

The subsequent reorientation of Tyr and the loop — has two effects. This is an open-access article distributed under glycosyltransfedase terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Academic Press, New York,p. We denote this sugar transfer step circularization to distinguish it as glycosyltransfeerase subprocess of cyclization.

Cyclodextrin glycosyltransferase

Due to the decreased coupling activity, which especially affects the production of larger cyclodextrins, this CGTase variant produced the various cyclodextrins in a stable ratio in time.


Submit your work to JBC. Ann Jose ankara escort. Its ability to perform cyclization has led to the application of CGTases in glycosyltramsferase industrial production of cyclodextrins 4. Production and further characterization of an alkaline elastase produced by alkalophilic Bacillus strain Ya-B.

The Application of Cyclodextrin Glycosyltransferase in Biological Science

Furthermore, the glucose O6 atom is pointing toward Tyr, while the sugar O3 atom forms a good 2. Ultra filtration-centrifugation and analysis by electrophoresis The proteins of the acetone-concentrated culture filtrates precipitate 1 were submitted to treatments with Ultrafree 30 kDa NMWL and kDa NMWL Millipore membranes g15 min.

Further cycloextrin should be focused on what reason caused their different transferring capacities. It suggests that in the maltononaose complex, His is optimally positioned to contribute to catalysis 7. The non-denaturing condition electrophoresis was carried out according to Davis 5 and it allowed the identification of CGTase activity in the gel, using two polyacrylamide identical gels, being one stained and the other put on a plate containing starch, agar and phenolphthalein pH Dry derivatized enzyme and CD 8 were dissolved in potassium phosphate buffer.

The coupling reaction can be easily described as the reverse process of cyclization: The apparent molecular weight of the CGTase purified was Home Publications Conferences Register Contact. The first fraction was concentrated with acetone 1: B is a proposed model. The growth of the B.

However, this work verified that in culture medium added of 0. You’ll be in good company.

It is located far from the active site, at the interface of the A and D domains. The costs of publication of this article were defrayed in part by the payment of page charges. An unit of CGTase activity was defined as the amount of enzyme that produces 1 m mol of b -CD per minute, under the assay conditions. Furthermore, crystalline complexes that are the results of this process are stable, a characteristic that glycosyltransferasf provide many benefits cycoldextrin The labels indicate subsite nomenclature.


An alkalophilic Bacillus strain, isolated from cassava peels, was identified as Bacillus licheniformis. Figure 1 Schematic representation of the cyclization reaction catalyzed by CGTase. After bond cleavage, the next step in cyclization is circularization Fig.

The Application of Cyclodextrin Glycosyltransferase in Biological Science | OMICS International

Views Read Edit View history. These data indicate that glucose exerts repressor effect of the synthesis enzymatic.

These results showed that the cyclodexrtin presented high affinity for the substrate, when compared with literature data. The electron density clearly shows that the cyclic symmetry of the latter CD is spectacularly deformed Figs.

Imprinted derivatized CGTase were suspended in dry cyclohexane by using an ultrasonication bath. The method used for qualitative analysis is interesting, fast and reproductive. Our analysis cyclodextin the structures of B. The industrial production of CGTase was made attractive only when alkaliphilic Bacillus species were introduced as producing organism Determination of the specific activity of CGTase.

Simplified method for silver staining of proteins in polyacrylamide gels and the mechanism of silver staining.

Cyclodextrins are likely glycosyltransgerase induced cyclodextrin glycosyltransferase production in Bacillus macerans. Two fractions of the culture filtrate were taken for the determination of the optimal hydrolysis temperature.