Purification of an isoflavonoid 7-O-β-apiosyl-glucoside β-glycosidase and its substrates from Dalbergia nigrescens Kurz
A β-glycosidase which hydrolyzes isoflavonoid glycosides, removing β-apiosyl glucose, and two substrates were purified from Dalbergia nigrescens seeds, and the glycoside substrate structures were identified. A β-glycosidase was purified from the seeds of Dalbergia nigescens Kurz based on its ability...
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Published in | Phytochemistry (Oxford) Vol. 66; no. 16; pp. 1880 - 1889 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
OXFORD
Elsevier Ltd
01.08.2005
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | A β-glycosidase which hydrolyzes isoflavonoid glycosides, removing β-apiosyl glucose, and two substrates were purified from
Dalbergia nigrescens seeds, and the glycoside substrate structures were identified.
A β-glycosidase was purified from the seeds of
Dalbergia nigescens Kurz based on its ability to hydrolyse
p-nitrophenyl β-glucoside and β-fucoside. This enzyme did not hydrolyze various glycosidic substrates efficiently, so it was used to identify its own natural substrates. Two substrates were identified, isolated and their structures determined as: compound
1, dalpatein 7-O-β-
d-apiofuranosyl-(1
→
6)-β-
d-glucopyranoside and compound
2, 6,2′,4′,5′-tetramethoxy-7-hydroxy-7-O-β-
d-apiofuranosyl-(1
→
6)-β-
d-glucopyranoside (dalnigrein7-O-β-
d-apiofuranosyl-(1
→
6)-β-
d-glucopyranoside). The β-glycosidase removes the sugar from these glycosides as a disaccharide, despite its initial identification as a β-glucosidase and β-fucosidase. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0031-9422 1873-3700 |
DOI: | 10.1016/j.phytochem.2005.06.024 |