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Title: Characterization of Coptis japonica CjABCB2, an ATP-binding cassette protein involved in alkaloid transport.
Authors: Shitan, Nobukazu
Dalmas, Fabien
Dan, Kazuyuki
Kato, Nobuhiko
Ueda, Kazumitsu  kyouindb  KAKEN_id  orcid (unconfirmed)
Sato, Fumihiko  kyouindb  KAKEN_id
Forestier, Cyrille
Yazaki, Kazufumi  kyouindb  KAKEN_id
Author's alias: 矢崎, 一史
Keywords: Coptis japonica
ABC transporter
Issue Date: Jul-2013
Publisher: Elsevier Ltd.
Journal title: Phytochemistry
Volume: 91
Start page: 109
End page: 116
Abstract: Higher plants produce a large number of secondary metabolites. Among these are the alkaloids, a group of small nitrogen-containing molecules. Alkaloids often have strong biological activity that protects alkaloid-producing plants from herbivores, and often accumulate to high concentrations in a specific organelle of a particular organ in the producing plant. However, knowledge of the membrane transport mechanism of alkaloids is still limited. Coptis japonica, a perennial Ranunculaceous plant, produces the benzylisoquinoline alkaloid berberine. This alkaloid, though biosynthesized in root tissues, accumulates in the rhizome, suggesting translocation of the molecule via xylem. In this study, a gene encoding a ATP-binding cassette (ABC) protein of B-type, Cjabcb2, was isolated from C. japonica. Northern analysis showed that Cjabcb2 was preferentially expressed in the rhizome, which is the sink organ of berberine. Functional analysis of CjABCB2 using yeast suggested that CjABCB2 transports berberine in an inward direction. Membrane separation and in situ hybridization data indicated that CjABCB2 might be involved in translocation of berberine from the root to the rhizome by transporting berberine at the plasma membrane of cells around the xylem of the rhizome.
Rights: © 2012 Elsevier Ltd.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1016/j.phytochem.2012.02.012
PubMed ID: 22410351
Appears in Collections:Journal Articles

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