Publication Date:
2000-11-10
Description:
Aurones are plant flavonoids that provide yellow color to the flowers of some popular ornamental plants, such as snapdragon and cosmos. In this study, we have identified an enzyme responsible for the synthesis of aurone from chalcones in the yellow snapdragon flower. The enzyme (aureusidin synthase) is a 39-kilodalton, copper-containing glycoprotein catalyzing the hydroxylation and/or oxidative cyclization of the precursor chalcones, 2',4',6',4-tetrahydroxychalcone and 2',4',6',3,4-pentahydroxychalcone. The complementary DNA encoding aureusidin synthase is expressed in the petals of aurone-containing varieties. DNA sequence analysis revealed that aureusidin synthase belongs to the plant polyphenol oxidase family, providing an unequivocal example of the function of the polyphenol oxidase homolog in plants, i.e., flower coloration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nakayama, T -- Yonekura-Sakakibara, K -- Sato, T -- Kikuchi, S -- Fukui, Y -- Fukuchi-Mizutani, M -- Ueda, T -- Nakao, M -- Tanaka, Y -- Kusumi, T -- Nishino, T -- New York, N.Y. -- Science. 2000 Nov 10;290(5494):1163-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Aoba-yama 07, Sendai 980-8579, Japan. nakayama@seika.che.tohoku.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11073455" target="_blank"〉PubMed〈/a〉
Keywords:
Amino Acid Sequence
;
Angiosperms/*enzymology/genetics
;
Benzofurans/*metabolism
;
Catalysis
;
Catechol Oxidase/chemistry/metabolism
;
Cyclization
;
DNA, Complementary
;
Enzyme Precursors/chemistry/genetics/isolation & purification/metabolism
;
Genes, Plant
;
Hydroxylation
;
Mixed Function Oxygenases/chemistry/genetics/isolation & purification/metabolism
;
Molecular Sequence Data
;
Molecular Weight
;
Pigmentation
;
Plant Structures/enzymology
;
Plants/enzymology
;
Sequence Homology, Amino Acid
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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