Cis-elements of protein transport to the plant vacuoles

Ken Matsuoka, Jean Marc Neuhaus

Research output: Contribution to journalReview article

90 Citations (Scopus)

Abstract

Vacuolar proteins are synthesized and translocated into the endoplasmic reticulum and transported to the vacuoles through the secretory pathway. Three different types of vacuolar sorting signals have been identified, carried by N- or C-terminal propeptides or internal sequences. These signals are needed to target proteins to the different types of vacuoles that can coexist in a single plant cell. A conserved motif (NPIXL or NPIR) was identified within N-terminal propeptides, but can also function in a C-terminal propeptide and targets proteins in a receptor-mediated manner to a lytic vacuole. Binding to a family of putative sorting receptors for sequence-specific vacuolar sorting signals has been used as an assay to identify further peptides with other binding motifs. No motif was found in C-terminal sorting sequences, which need an accessible terminus, suggesting that they are recognized from the end by a still unknown receptor. The phosphatidylinositol kinase inhibitor wortmannin differentially affects sorting mediated by these two sorting sequences, suggesting different sorting mechanisms. Less is known about sorting mediated by internal protein sequences, which do not contain the conserved motif identified in N-terminal propeptides and may function by aggregation, leading to transport by coat-less dense vesicles to protein storage vacuoles. Even less is known about the sorting of tonoplast proteins, for which several sorting systems will also be needed.

Original languageEnglish
Pages (from-to)165-174
Number of pages10
JournalJournal of Experimental Botany
Volume50
Issue number331
DOIs
Publication statusPublished - Jan 1 1999

Fingerprint

protein transport
Protein Transport
Vacuoles
sorting
vacuoles
Proteins
Secretory Pathway
Plant Cells
Phosphatidylinositols
Endoplasmic Reticulum
receptors
Phosphotransferases
proteins
1-phosphatidylinositol 4-kinase
Peptides
tonoplast
storage proteins
endoplasmic reticulum
amino acid sequences
peptides

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

Cite this

Cis-elements of protein transport to the plant vacuoles. / Matsuoka, Ken; Neuhaus, Jean Marc.

In: Journal of Experimental Botany, Vol. 50, No. 331, 01.01.1999, p. 165-174.

Research output: Contribution to journalReview article

Matsuoka, Ken ; Neuhaus, Jean Marc. / Cis-elements of protein transport to the plant vacuoles. In: Journal of Experimental Botany. 1999 ; Vol. 50, No. 331. pp. 165-174.
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