The Tr-cp 14 cysteine protease in white clover (Trifolium repens) is localized to the endoplasmic reticulum and is associated with programmed cell death during development of tracheary elements

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  • Maria Mulisch, Institute of Botany and Central Microscopy, Christian-Albrechts-University Kiel, Tyskland
  • Torben Asp
  • Karin Krupinska, Institute of Botany and Central Microscopy, Christian-Albrechts-University Kiel, Tyskland
  • Julien Hollmann, Institute of Botany and Central Microscopy, Christian-Albrechts-University Kiel, Tyskland
  • Preben Bach Holm, Danmark
Cysteine proteases are known to be associated with programmed cell death, developmental senescence and some types of pathogen and stress-induced responses. In the present study, we have characterized the cysteine protease Tr-cp 14 in white clover (Trifolium repens). Tr-cp 14 belongs to the C1A family of cysteine proteases with homology to XCP1 and XCP2 from Arabidopsis thaliana and p48h-17 from Zinnia elegans, which previously have been reported to be associated with tracheary element differentiation. The proform as well as the processed form of the protein was detected in petioles, flowers and leaves, but the processed form was more abundant in leaves and petioles than in flowers. The Tr-cp 14 protein was localized to differentiating tracheary elements within the xylem, indicating that the cysteine protease is involved in protein re-mobilization during tracheary element differentiation. Immunogold studies suggest that the protease prior to the burst of the vacuole was associated to the ER cisternae. After disruption of the tonoplast, it was found in the cytoplasm, and, in later stages, associated with disintegrating material dispersed throughout the cell.
OriginalsprogEngelsk
TidsskriftProtoplasma
Vol/bind250
Nummer2
Sider (fra-til)623-629
Antal sider7
ISSN0033-183X
DOI
StatusUdgivet - apr. 2013

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