Dual Substrate Specificity of the Rutinosidase fromAspergillus nigerand the Role of Its Substrate Tunnel

0532691 - MBÚ 2021 RIV CH eng J - Článek v odborném periodiku
Brodsky, Katerina - Kutý, Michal - Pelantová, Helena - Cvačka, Josef - Rebroš, M. - Kotík, Michael - Kutá Smatanová, Ivana - Křen, Vladimír - Bojarová, Pavla
Dual Substrate Specificity of the Rutinosidase fromAspergillus nigerand the Role of Its Substrate Tunnel.
International Journal of Molecular Sciences. Roč. 21, č. 16 (2020), č. článku 5671. E-ISSN 1422-0067
Grant CEP: GA ČR(CZ) GA19-00091S; GA MŠMT(CZ) LTC20069
Institucionální podpora: RVO:61388971 ; RVO:61388963
Klíčová slova: azide * glycosylation * molecular modeling
Obor OECD: Biochemistry and molecular biology; Analytical chemistry (UOCHB-X)
Impakt faktor: 5.924, rok: 2020
Způsob publikování: Open access
https://www.mdpi.com/1422-0067/21/16/5671

Rutinosidases (alpha-l-rhamnopyranosyl-(1-6)-beta-d-glucopyranosidases, EC 3.2.1.168, CAZy GH5) are diglycosidases that cleave the glycosidic bond between the disaccharide rutinose and the respective aglycone. Similar to many retaining glycosidases, rutinosidases can also transfer the rutinosyl moiety onto acceptors with a free -OH group (so-called transglycosylation). The recombinant rutinosidase fromAspergillus niger(AnRut) is selectively produced inPichia pastoris.It can catalyze transglycosylation reactions as an unpurified preparation directly from cultivation. This enzyme exhibits catalytic activity towards two substrates, in addition to rutinosidase activity, it also exhibits beta-d-glucopyranosidase activity. As a result, new compounds are formed by beta-glucosylation or rutinosylation of acceptors such as alcohols or strong inorganic nucleophiles (NaN3). Transglycosylation products with aliphatic aglycones are resistant towards cleavage by rutinosidase, therefore, their side hydrolysis does not occur, allowing higher transglycosylation yields. Fourteen compounds were synthesized by glucosylation or rutinosylation of selected acceptors. The products were isolated and structurally characterized. Interactions between the transglycosylation products and the recombinantAnRut were analyzed by molecular modeling. We revealed the role of a substrate tunnel in the structure ofAnRut, which explained the unusual catalytic properties of this glycosidase and its specific transglycosylation potential.AnRut is attractive for biosynthetic applications, especially for the use of inexpensive substrates (rutin and isoquercitrin).
Trvalý link: http://hdl.handle.net/11104/0311112