Metabolic engineering of tomato for high-yield production of astaxanthin
文献类型: 外文期刊
第一作者: Huang, Jun-Chao
作者: Huang, Jun-Chao;Zhong, Yu-Juan;Liu, Jin;Zhong, Yu-Juan;Sandmann, Gerhard;Chen, Feng
作者机构:
关键词: Astaxanthin;beta-carotene ketolase;beta-carotene hydroxylase;Tomato
期刊名称:METABOLIC ENGINEERING ( 影响因子:9.783; 五年影响因子:9.566 )
ISSN: 1096-7176
年卷期: 2013 年 17 卷
页码:
收录情况: SCI
摘要: Dietary carotenoids have been shown to be beneficial to health by decreasing the risk of many diseases. Attempts to enhance carotenoids in food crops have been successful although higher plants appear to resist big changes of carotenoid biosynthesis by metabolic engineering. Here we report the generation of a more nutritious tomato by modifying the intrinsic carotenes to astaxanthin, a high-value ketocarotenoid rarely found in plants. This was achieved by co-expression of the algal beta-carotene ketolase from Chlamydomonas reinhardtii and beta-carotene hydroxylase from Haematococcus pluvialis, a unique pair of enzymes identified to co-operate perfectly in converting p-carotene to astaxanthin by functional complementation in Escherichia coli. Expression of the two enzymes in tomato up-regulated most intrinsic carotenogenic genes, and efficiently directed carbon flux into carotenoids, leading to massive accumulations of mostly free astaxanthin in leaves (3.12 mg/g) but esterified astaxanthin in fruits (16.1 mg/g) and a 16-fold increase of total carotenoid capacity therein without affecting the plant normal growth and development. This study opened up the possibility of employing crop plants as green factories for economical production of astaxanthin. (C) 2013 Elsevier Inc. All rights reserved.
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