AustralieFrV1, Main, Exploration, bibRecord, 006C72

Characterization of a transport activity for long-chain peptides in barley mesophyll vacuoles

Identifieur interne : 006C72 ( Main/Exploration ); précédent : 006C71; suivant : 006C73

Characterization of a transport activity for long-chain peptides in barley mesophyll vacuoles

Auteurs : Magali Schnell Ramos [Suisse, France] ; Rupert Abele [Allemagne] ; Reka Nagy [Suisse] ; Marianne Suter Grotemeyer [Suisse] ; Robert Tampe [Allemagne] ; Doris Rentsch [Suisse] ; Enrico Martinoia [Suisse]

Source :

Journal of experimental botany [ 0022-0957 ] ; 2011.

RBID : Pascal:11-0251115

Descripteurs français

Pascal (Inist)
- Transport, Peptide, Orge, Feuille végétal, Vacuole, Botanique, Hordeum vulgare, Chaîne longue, Transporteur ABC, Mésophylle.
Wicri :
- topic : Orge, Botanique.

English descriptors

KwdEn :
- ABC transporter, Barley, Botany, Hordeum vulgare, Long chain, Mesophyll, Peptides, Plant leaf, Transport, Vacuole.

Abstract

The plant vacuole is the largest compartment in a fully expanded plant cell. While only very limited metabolic activity can be observed within the vacuole, the majority of the hydrolytic activities, including proteolytic activities reside in this organelle. Since it is assumed that protein degradation by the proteasome results in the production of peptides with a size of 3-30 amino acids, we were interested to show whether the tonoplast exhibits a transport activity, which could deliver these peptides into the vacuole for final degradation. It is shown here that isolated barley mesophyll vacuoles take up peptides of 9-27 amino acids in a strictly ATP-dependent manner. Uptake is inhibited by vanadate, but not by NH⁺₄, while GTP could partially substitute for ATP. The apparent affinity for the 9 amino acid peptide was 15 μM, suggesting that peptides are efficiently transferred to the vacuole in vivo. Inhibition experiments showed that peptides with a chain length below 10 amino acids did not compete as efficiently as longer peptides for the uptake of the 9 amino acid peptide. Our results suggest that vacuoles contain at least one peptide transporter that belongs to the ABC-type transporters, which efficiently exports long-chain peptides from the cytosol into the vacuole for final degradation.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The plant vacuole is the largest compartment in a fully expanded plant cell. While only very limited metabolic activity can be observed within the vacuole, the majority of the hydrolytic activities, including proteolytic activities reside in this organelle. Since it is assumed that protein degradation by the proteasome results in the production of peptides with a size of 3-30 amino acids, we were interested to show whether the tonoplast exhibits a transport activity, which could deliver these peptides into the vacuole for final degradation. It is shown here that isolated barley mesophyll vacuoles take up peptides of 9-27 amino acids in a strictly ATP-dependent manner. Uptake is inhibited by vanadate, but not by NH<sup>+</sup>
<sub>4</sub>
, while GTP could partially substitute for ATP. The apparent affinity for the 9 amino acid peptide was 15 μM, suggesting that peptides are efficiently transferred to the vacuole in vivo. Inhibition experiments showed that peptides with a chain length below 10 amino acids did not compete as efficiently as longer peptides for the uptake of the 9 amino acid peptide. Our results suggest that vacuoles contain at least one peptide transporter that belongs to the ABC-type transporters, which efficiently exports long-chain peptides from the cytosol into the vacuole for final degradation.</div>
</front>
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<country name="Allemagne"><region name="Hesse (Land)"><name sortKey="Abele, Rupert" sort="Abele, Rupert" uniqKey="Abele R" first="Rupert" last="Abele">Rupert Abele</name>
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Characterization of a transport activity for long-chain peptides in barley mesophyll vacuoles

Characterization of a transport activity for long-chain peptides in barley mesophyll vacuoles

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri