Acceptor Specificity of beta-N-Acetylhexosaminidase from Talaromyces flavus: A Rational Explanation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F19%3A00336103" target="_blank" >RIV/68407700:21460/19:00336103 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3390/ijms20246181" target="_blank" >https://doi.org/10.3390/ijms20246181</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/ijms20246181" target="_blank" >10.3390/ijms20246181</a>
Alternative languages
Result language
angličtina
Original language name
Acceptor Specificity of beta-N-Acetylhexosaminidase from Talaromyces flavus: A Rational Explanation
Original language description
Fungal beta-N-acetylhexosaminidases, though hydrolytic enzymes in vivo, are useful tools in the preparation of oligosaccharides of biological interest. The beta-N-acetylhexosaminidase from Talaromyces flavus is remarkable in terms of its synthetic potential, broad substrate specificity, and tolerance to substrate modifications. It can be heterologously produced in Pichia pastoris in a high yield. The mutation of the Tyr470 residue to histidine greatly enhances its transglycosylation capability. The aim of this work was to identify the structural requirements of this model beta-N-acetylhexosaminidase for its transglycosylation acceptors and formulate a structure-activity relationship study. Enzymatic reactions were performed using an activated glycosyl donor, 4-nitrophenyl N-acetyl-beta-d-glucosaminide or 4-nitrophenyl N-acetyl-beta-d-galactosaminide, and a panel of glycosyl acceptors of varying structural features (N-acetylglucosamine, glucose, N-acetylgalactosamine, galactose, N-acetylmuramic acid, and glucuronic acid). The transglycosylation products were isolated and structurally characterized. The C-2 N-acetamido group in the acceptor molecule was found to be essential for recognition by the enzyme. The presence of the C-2 hydroxyl moiety strongly hindered the normal course of transglycosylation, yielding unique non-reducing disaccharides in a low yield. Moreover, whereas the gluco-configuration at C-4 steered the glycosylation into the beta(1-4) position, the galacto-acceptor afforded a beta(1-6) glycosidic linkage. The Y470H mutant enzyme was tested with acceptors based on beta-glycosides of uronic acid and N-acetylmuramic acid. With the latter acceptor, we were able to isolate and characterize one glycosylation product in a low yield.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10401 - Organic chemistry
Result continuities
Project
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Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Molecular Sciences
ISSN
1422-0067
e-ISSN
1422-0067
Volume of the periodical
20
Issue of the periodical within the volume
24
Country of publishing house
CH - SWITZERLAND
Number of pages
17
Pages from-to
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UT code for WoS article
000506840100075
EID of the result in the Scopus database
2-s2.0-85076363105