Meuwly P, Thibault P, Rauser W E
Department of Botany, College of Biological Sciences, University of Guelph, Ont, Canada.
FEBS Lett. 1993 Dec 28;336(3):472-6. doi: 10.1016/0014-5793(93)80858-r.
Exposure of plants to Cd induces the appearance of several thiols based on glutathione and known as class III metallothioneins (or phytochelatins). A new tripeptide with the structure gamma-GluCysGlu accumulated in roots and shoots of Cd-exposed maize seedlings. This thiol was purified and identified by tandem mass spectrometry. The fragmentation pattern of the maize tripeptide was identical to that of the synthetic compound. Like glutathione, this new tripeptide may serve as a precursor for longer-chain peptides involved in metal detoxification through the formation of Cd-binding complexes.
植物暴露于镉会诱导出现几种基于谷胱甘肽的硫醇，即III类金属硫蛋白（或植物螯合肽）。一种结构为γ-谷氨酰半胱氨酰谷氨酸的新三肽在暴露于镉的玉米幼苗的根和芽中积累。这种硫醇通过串联质谱法进行了纯化和鉴定。玉米三肽的裂解模式与合成化合物的裂解模式相同。与谷胱甘肽一样，这种新三肽可能作为长链肽的前体，通过形成镉结合复合物参与金属解毒。
