Homoglutathione Synthesis in Transgenic Tobacco Plants Expressing Soybean Homoglutathione Synthetase

Homoglutathione Synthesis in Transgenic Tobacco Plants Expressing Soybean Homoglutathione Synthetase
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表达大豆同谷胱甘肽合成酶的转基因烟草植物中的同谷胱甘肽合成

DOI:
10.5511/plantbiotechnology.21.79
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发表时间:
2004
影响因子:
1.6
通讯作者:
J. Sekiya
J. Sekiya
中科院分区:
工程技术4区
文献类型:
--
作者:
A. Sugiyama;J. Nishimura*;Yasuhiro Mochizuki;Keisuke Inagaki;J. Sekiya

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高谷胱甘肽(hGSH)存在于包括大豆和菜豆在内的一些豆科植物中。然而,迄今为止,在非豆科植物中hGSH的合成还没有报道。我们构建了表达大豆hGSH合成酶(hGSHS)的转基因烟草植株。虽然转基因烟草表现出比谷胱甘肽(GSH)合成酶活性更高的hGSH合成酶活性,但hGSH含量远低于GSH含量。前体补料实验表明,hGSH合成受到γ-L-谷氨酰-L-半胱氨酸和β-丙氨酸的可用性的限制。这一结果还表明,烟草GSH合成的主要部位不是细胞质。
Homoglutathione (hGSH) is present in some leguminous plants including soybean and bean. However, hGSH synthesis in non-leguminous plants has not been reported so far. We constructed transgenic tobacco plants expressing soybean hGSH synthetase (hGSHS). Although the transgenic tobacco plants exhibited higher hGSHS activity than glutathione (GSH) synthetase activity, hGSH content was much lower than GSH content. Precursor feeding experiments revealed that hGSH synthesis was limited by the availability of both γ-L-glutamyl-L-cysteine and β-alanine. The result also suggests that the major site of GSH synthesis in tobacco plants is not cytosol.
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