Changes in the levels of phytochelatins and related metal-binding peptides in chickpea seedlings exposed to arsenic and different heavy metal ions

2004 ◽  
Vol 117 (3) ◽  
Author(s):  
DharmendraK. Gupta ◽  
Hiroshi Tohoyama ◽  
Masanori Joho ◽  
Masahiro Inouhe
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Binding ◽  
Heavy Metal Ions ◽  
Metal Binding Peptides ◽  
Binding Peptides

Homo-phytochelatins are heavy metal-binding peptides of homo-glutathione containing Fabales

FEBS Letters ◽  
1986 ◽  
Vol 205 (1) ◽  
pp. 47-50 ◽  
Author(s):  
E. Grill ◽  
W. Gekeler ◽  
E.-L. Winnacker ◽  
H.H. Zenk
Keyword(s):  
Heavy Metal ◽  
Metal Binding ◽  
Metal Binding Peptides ◽  
Heavy Metal Binding ◽  
Binding Peptides

scholarly journals Sorption performance of cysteine-modified bentonite in heavy metals uptake

2009 ◽  
Vol 74 (7) ◽  
pp. 833-843 ◽  
Author(s):  
Hossein Faghihian ◽  
Massoud Nejati-Yazdinejad
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Binding ◽  
Heavy Metal Ions ◽  
Sorption Isotherms ◽  
Local Clay ◽  
Lead And Cadmium ◽  
Sorption Parameters ◽  
Thiol Ligand ◽  
Heavy Metals Uptake

A local clay, bentonite (N-Ben), was modified by the biologically-based ligand, cysteine (Cys), through a simple sorption technique. The modified sorbent (Cys-Ben) demonstrated affinity for soft and moderately soft heavy metal ions (HMI), such as Cd(II) and Pb(II), probably as a result of the soft basic character of the thiol ligand side chains. The resulting modified system was effective for metal binding with capacities of 0.503 and 0.525 mmol g-1, for Pb(II) and Cd(II), respectively. Comparative batch experiments were performed for removing lead and cadmium from aqueous solutions. The sorption parameters were derived from a Langmuir fit to the sorption isotherms of the studied ions. The study showed that the sorption capacity of Cys-Ben was higher than that of N-Ben for these ions. The effect of pH was examined over the range 2.0-6.0. The sorption capacities of Cys-Ben showed that this modified clay is a good sorbent for the examined heavy metal ions.

Biosynthetic regulation of phytochelatins, heavy metal-binding peptides

2005 ◽  
Vol 100 (6) ◽  
pp. 593-599 ◽  
Author(s):  
Kazumasa Hirata ◽  
Naoki Tsuji ◽  
Kazuhisa Miyamoto
Keyword(s):  
Heavy Metal ◽  
Metal Binding ◽  
Metal Binding Peptides ◽  
Heavy Metal Binding ◽  
Binding Peptides

Heavy Metal-Binding Peptides and Proteins in Plants. A Review

1999 ◽  
Vol 64 (7) ◽  
pp. 1057-1086 ◽  
Author(s):  
Pavel Kotrba ◽  
Tomáš Macek ◽  
Tomáš Ruml
Keyword(s):  
Heavy Metal ◽  
Metal Binding ◽  
Metal Ion ◽  
Plant Pathogens ◽  
General Structure ◽  
Transition Metal Ions ◽  
Stress Factors ◽  
Sucrose Starvation ◽  
Metal Binding Peptides ◽  
Binding Peptides

In plants, two kinds of specific metal-binding peptides or proteins are synthesized. Plant metallothioneins (MTs) and MT-like proteins are cysteine-rich translation products of genes inducible in tissue-specific manner during embryogenesis and plant development. In addition, differential expression of MT-like protein genes could be due to variation of external heavy metal concentrations (especially of Cu2+ and Fe2+), influence of various stress factors (heat shock, sucrose starvation, oxidative stress, wounding, plant pathogens). The principal role of plant MTs and MT-like proteins seems to be in homeostasis of essential transition metals rather than in metal detoxification. Phytochelatins (PCs) have general structure (γ-Glu-Cys)n-Xaa, where n = 2-11 and Xaa amino acids Gly, β-Ala, Ser, and Glu which depend on the species; the des-Xaa forms of PC also exist. PCs are synthesized in plants and some yeasts by a constitutive enzyme phytochelatin synthase (active only in the presence of free heavy metal ion) from glutathione or its anologue. Despite the PC capability of forming complexes with transition metal ions (their role in metal homeostasis could not be excluded) and virtually prominent role in Cd2+ detoxification within plant cell, there is no evidence that elevated production of PCs may contribute to differential tolerance and/or could be responsible for the resistance to toxic metals. A review with 172 references.

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