PUMA
Istituto di Biofisica     
Morelli E., Pratesi E. Production of Phytochelatins in the Marine Diatom Phaeodactylum tricornutum in Response to Copper and Cadmium Exposure. In: Bulletin of Environmental Contamination and Toxicology, vol. 59 (4) pp. 657 - 664. Springer, 1997.
 
 
Abstract
(English)
Plants, algae and some fungi are capable of synthesizing, on exposure to heavy metals, thiol-rich peptides (g-glutamylcysteinyl) n-glycine with n=2 to 11, also known as phytochelatins (Grill et al. 1985). Phytochelatins (PCs) seem to be involved in detoxification and homeostasis of trace metals in plants and thus serve functions analogous to metallothioneins in animals. Phytochelatins are enzymatically synthesized by a specific g - glutamylcysteine -dipeptidyl transpeptidase (phytochelatin synthase) which is activated by the presence of metal ions and uses glutathione as a substrate (Grill et al. 1989). Phytochelatins bind metal ions by thiolate coordination yielding intracellular metal complexes.
Abstract
(Italiano)
Bulletin of Environmental Contamination and Toxicology
DOI: 10.1007/s001289900530
Subject Phytochelatins


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