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- Title
A VPE family supporting various vacuolar functions in plants.
- Authors
Kenji Yamada; Tomoo Shimada; Mikio Nishimura; Ikuko Hara-Nishimura
- Abstract
Vacuolar processing enzyme (VPE) is a cysteine protease that has substrate specificity toward Asn and Asp residues, and found in various eukaryotic organisms including higher plants and mammals. Plant VPEs are separated into three subfamilies: seed-type, vegetative-type and uncharacterized-type. VPE was originally identified as a protease responsible for the maturation of seed storage proteins, and recent research has shown that it is a key protease responsible for the maturation of various vacuolar proteins not only in maturating cotyledons, but also in vegetative tissues. Thus, the VPE-mediated processing system is important for various vacuolar functions in the plant. Vegetative-type VPEs are expressed during senescence or pathogen-induced hypersensitive response. A VPE-deficiency abolished programmed cell death during hypersensitive response in tobacco leaves after TMV infection. This suggests that vegetative-type VPEs are involved in vacuolar-organized programmed cell death.
- Subjects
PLANT proteins; CYSTEINE proteinases; EUKARYOTIC cells; CELL death; PLANT cells &; tissues; PLANT physiology
- Publication
Physiologia Plantarum, 2005, Vol 123, Issue 4, p369
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.2005.00464.x