An engineered C-terminal disulfide bond can partially replace the phaseolin vacuolar sorting signal. (Articolo in rivista)

Type
Label
  • An engineered C-terminal disulfide bond can partially replace the phaseolin vacuolar sorting signal. (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Pompa A., De Marchis F., Vitale A., Arcioni S., Bellucci M. (2009)
    An engineered C-terminal disulfide bond can partially replace the phaseolin vacuolar sorting signal.
    in Plant journal (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Pompa A., De Marchis F., Vitale A., Arcioni S., Bellucci M. (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Genetica Vegetale, Consiglio Nazionale delle Ricerche, via della Madonna Alta 130, 06128 Perugia, Italy , and Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche, via Bassini 15, 20133 Milano, Italy (literal)
Titolo
  • An engineered C-terminal disulfide bond can partially replace the phaseolin vacuolar sorting signal. (literal)
Abstract
  • Seed storage proteins accumulate either in the endoplasmic reticulum (ER) or in vacuoles, and it would appear that polymerization events play a fundamental role in regulating the choice between the two destinies of these proteins. We previously showed that a fusion between the Phaseolus vulgaris vacuolar storage protein phaseolin and the N-terminal half of the Zea mays prolamin ³-zein forms interchain disulfide bonds that facilitate the formation of ER-located protein bodies. Wild-type phaseolin does not contain cysteine residues, and assembles into soluble trimers that transiently polymerize before sorting to the vacuole. These transient interactions are abolished when the C-terminal vacuolar sorting signal AFVY is deleted, indicating that they play a role in vacuolar sorting. We reasoned that if the phaseolin interactions directly involve the C terminus of the polypeptide, a cysteine residue introduced into this region could stabilize these transient interactions. Biochemical studies of two mutated phaseolin proteins in which a single cysteine residue was inserted at the C terminus, in the presence (PHSL*) or absence (”418*) of the vacuolar signal AFVY, revealed that these mutated proteins form disulphide bonds. PHSL* had reduced protein solubility and a vacuolar trafficking delay with respect to wild-type protein. Moreover, ”418* was in part redirected to the vacuole. Our experiments strongly support the idea that vacuolar delivery of phaseolin is promoted very early in the sorting process, when polypeptides are still contained within the ER, by homotypic interactions (literal)
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