摘要
植物螯合肽(phytochelatins,PCs)在植物解除重金属的毒性方面具有重要作用,其结构为(γ-Glu-Cys)n-Gly(n=2~11),它不是基因的编码产物,而是在植物螯合肽合成酶(phytochelatin synthase,PCS)的催化下以谷胱甘肽(glutathione,GSH)为底物合成的。PCS能够被金属离子激活,高度保守的N-端是催化结构域,而其C-端则是多变的。本文就PCS的结构,功能与催化机制以及PCS的最新研究进行了介绍。
Phytochelatins (PCs), with a general structure (γ-Glu-Cys)n-Gly (n=2-11), play an important role in heavy metal detoxification in plants. PCs are post-translationally synthesized directly from glutathione (GSH) by the enzyme phytochelatin synthase (PCS), of which the activity is dependent on the presence of heavy metals. The conserved N-terminal core domain of PCS functions as the catalytic domain, whereas the C-terminal region is highly variable. The review focused on the structure, functions and catalytic mechanisms of PCS, prospects were also included.
出处
《植物生理学报》
CAS
CSCD
北大核心
2011年第1期27-36,共10页
Plant Physiology Journal
基金
湖北省重点(培育)学科农业资源利用(0903)
湖北省自然科学基金项目(2005ABA083)