Modulation of flower colour by rationally designed dominant-negative chalcone synthase

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The intensity of flower colour, mainly determined by the amount of anthocyanin, is an important horticultural trait. To modulate flower colour intensity, post-transcriptional gene silencing (PTGS)-based technology has been widely used. The constraint of PTGS, however, is that it requires a high degree of conservation in the nucleotide sequences of the target and the silencer. Further, it is difficult to restrict PTGS to the desired tissue or organ due to its systemic spread. To overcome these problems, dominant-negative chalcone synthase (CHS) enzymes have been developed by mutating a cysteine that is essential for the catalytic activity and a methionine that protrudes into the adjoining CHS monomer, as shown through crystallography. The dominant-negative action of mutated CHS enzymes from Mazus Japonicus are demonstrated using transgenic Arabidopsis. Also, the modulation of Petunia flower colour intensity by the dominant-negative CHS is shown. The data support the crystallography result showing the importance of the protruding methionine for the function of the adjoining CHS monomer. Furthermore, the modulation of anthocyanin production by the mutated Mazus CHS in Arabidopsis and petunia suggests that the dominant-negative CHS can be used even in distantly related species.
Publisher
OXFORD UNIV PRESS
Issue Date
2007
Language
English
Article Type
Article
Keywords

PLANT POLYKETIDE BIOSYNTHESIS; PETUNIA-HYBRIDA; DIHYDROFLAVONOL 4-REDUCTASE; TRANSCRIPTION FACTOR; ANTHOCYANIN BIOSYNTHESIS; FLAVONOID BIOSYNTHESIS; SUBSTRATE-SPECIFICITY; GENE; ARABIDOPSIS; EXPRESSION

Citation

JOURNAL OF EXPERIMENTAL BOTANY, v.58, no.10, pp.2471 - 2478

ISSN
0022-0957
DOI
10.1093/jxb/erm104
URI
http://hdl.handle.net/10203/90422
Appears in Collection
BS-Journal Papers(저널논문)
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