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MgATP-dependent transport of phytochelatins across the tonoplast of oat roots
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MgATP-dependent transport of phytochelatins across the tonoplast of oat roots
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Journal Article
MgATP-dependent transport of phytochelatins across the tonoplast of oat roots
1995
Overview
In Cd-exposed oat (Avena sativa) roots Cd was found to be associated primarily with the phytochelatin (gamma-glutamylcysteinyl)3-glutamic acid [(gamma EC)3G], with a peptide to Cd ratio of 1:3 (cysteine to Cd ratio of 1:1), even though both (gamma EC)2G and (gamma EC)3G were present in the roots. Phytochelatins are known to accumulate in the vacuoles of plant cells on exposure to Cd, but the mechanism is not clear. Here we present evidence for the transport of the phytochelatins (gamma EC)3G and (gamma EC)2G as well as the Cd complex Cd-(gamma EC)3G across the tonoplast of oat roots. Transport of (gamma EC)3G had a Km for MgATP of 0.18 mM and a Vmax of 0.7 to 1 nmol mg-1 protein min-1. Transport of (gamma EC)3G was also energized by MgGTP and to a lesser extent MgUTP and was highly sensitive to orthovanadate, with a 50%-inhibitory concentration of 0.9 micromolars. The Cd complex Cd-(gamma EC)3G and (gamma EC)2G were also transported in a MgATP-dependent, vanadate-sensitive manner. Therefore, this process is a candidate for the transport of both phytochelatins, and Cd as its peptide complex, from the cytoplasm into the vacuole
Publisher
American Society of Plant Physiologists
Subject
/ Biological and medical sciences
/ CADMIO
/ CADMIUM
/ chemical constituents of plants
/ CISTEINA
/ CYSTEINE
/ Fundamental and applied biological sciences. Psychology
/ ION
/ IONES
/ Liquids
/ MAGNESIO
/ Non agrochemicals pollutants
/ Oats
/ PEPTIDE
/ PEPTIDOS
/ Phytopathology. Animal pests. Plant and forest protection
/ Plants
/ Pollution effects. Side effects of agrochemicals
/ QUELATOS
/ RACINE
/ RAICES
/ roots
/ Sodium
/ translocation (plant physiology)
/ VACUOLA
/ VACUOLE
/ Vacuoles
/ Whole Plant, Environmental, and Stress Physiology
/ Yeasts
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