Phytochelatins, the heavy-metal-binding peptides of plants, are synthesized from glutathione by a specific -glutamylcysteine dipeptidyl transpeptidase (phytochelatin synthase)
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چکیده
منابع مشابه
AtPCS1, a phytochelatin synthase from Arabidopsis: isolation and in vitro reconstitution.
Phytochelatins, a class of posttranslationally synthesized peptides, play a pivotal role in heavy metal, primarily Cd2+, tolerance in plants and fungi by chelating these substances and decreasing their free concentrations. Derived from glutathione and related thiols by the action of gamma-glutamylcysteine dipeptidyl transpeptidases (phytochelatin synthases; EC 2.3.2.15), phytochelatins consist ...
متن کاملPhytochelatins, a class of heavy-metal-binding peptides from plants, are functionally analogous to metallothioneins.
Phytochelatins are a class of heavy-metal-binding peptides previously isolated from cell suspension cultures of several dicotyledonous and monocotyledonous plants. These peptides consist of repetitive gamma-glutamylcysteine units with a carboxyl-terminal glycine and range from 5 to 17 amino acids in length. In the present paper we show that all plants tested synthesized phytochelatins upon expo...
متن کاملMolecular characterization of the homo-phytochelatin synthase of soybean Glycine max: relation to phytochelatin synthase.
The phytochelatin homologs homo-phytochelatins are heavy metal-binding peptides present in many legumes. To study the biosynthesis of these compounds, we have isolated and functionally expressed a cDNA GmhPCS1 encoding homo-phytochelatin synthase from Glycine max, a plant known to accumulate homo-phytochelatins rather than phytochelatins upon the exposure to heavy metals. The catalytic properti...
متن کاملEffect of Cd treatment on phytochelatin synthesis in maize
Phytochelatins are Cys-rich peptides enzymatically synthesized by γ-Glu-Cys dipeptidyl transpeptidase, generally known as phytochelatin synthase. In the present work the enzymes of phytochelatin synthesis and cadmium (Cd) accumulation were investigated during Cd stress. Young maize plants were treated with 0.1 mM Cd for 48 hours. Roots and leaves were used for the experiments. The Cd was accumu...
متن کاملLeaching of heavy metal from native plants by chemical leachants
Plant biomass harvested after heavy-metal phytoremediation must be considered as a hazardous waste that should be contained or treated appropriately before disposal or reuse. This study provides an evaluation of extractants for the removal of lead from Abutilon Theophrastus biomass. The research was carried out a leaching study to determine the lead-extraction efficiency of the different leacha...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1989
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.86.18.6838