Soybean seeds expressing feedback-insensitive cystathionine -synthase exhibit a higher content of methionine

文献类型： 外文期刊

第一作者： Song, Shikui

作者： Song, Shikui;Hou, Wensheng;Wu, Cunxiang;Yu, Yang;Sun, Shi;Han, Tianfu;Godo, Itamar;Matityahu, Ifat;Hacham, Yael;Amir, Rachel;Amir, Rachel

作者机构：

关键词： cystathionine gamma-synthase (CGS);Glycine max (L;) Merr;methionine;nutritional quality;proteins;sulfur-containing amino acids;soybean

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2013 年 64 卷 7 期

页码：

收录情况： SCI

摘要： Soybean seeds provide an excellent source of protein for human and livestock nutrition. However, their nutritional quality is hampered by a low concentration of the essential sulfur amino acid, methionine (Met). In order to study factors that regulate Met synthesis in soybean seeds, this study used the Met-insensitive form of Arabidopsis cystathionine -synthase (AtD-CGS), which is the first committed enzyme of Met biosynthesis. This gene was expressed under the control of a seed-specific promoter, legumin B4, and used to transform the soybean cultivar Zigongdongdou (ZD). In three transgenic lines that exhibited the highest expression level of AtD-CGS, the level of soluble Met increased significantly in developing green seeds (3.87-fold). These seeds also showed high levels of other amino acids. This phenomenon was more prominent in two transgenic lines, ZD24 and ZD91. The total Met content, which including Met incorporated into proteins, significantly increased in the mature dry seeds of these two transgenic lines by 1.8- and 2.3-fold, respectively. This elevation was accompanied by a higher content of other protein-incorporated amino acids, which led to significantly higher total protein content in the seeds of these two lines. However, in a third transgenic line, ZD01, the level of total Met and the level of other amino acids did not increase significantly in the mature dry seeds. This line also showed no significant change in protein levels. This suggests a positive connection between high Met content and the synthesis of other amino acids that enable the synthesis of more seed proteins.

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