Chloroplast-targeted ERD1 protein declines but its mRNA increases during senescence in Arabidopsis
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Biochemistry
- Michigan State Univ., East Lansing, MI (United States). DOE Plant Research Lab.
Arabidopsis ERD1 is a ClpC-like protein that sequence analysis suggests may interact with the chloroplast-localized ClpP protease to facilitate proteolysis. The mRNA encoded by the ERD1 gene has previously been shown to accumulate in response to senescence and to a variety of stresses and hormones. Here the authors show that the ERD1 protein, in contrast to the ERD1 mRNA, strongly declines in abundance with age, becoming undetectable in fully expanded leaves. Sequence analysis also suggests that ERD1 is chloroplast targeted, and they show in an in vitro system that the native protein is properly imported, processed, and present within the soluble fraction of the chloroplast, presumably the stroma. They show that ClpP protein, which is also present in the stroma, declines with age in parallel with ERD1. These results are consistent with the interaction of ERD1 and ClpP, but they suggest that it is unlikely that either plays a major role during senescence. Certain other chloroplast proteins decline with age coordinately with ERD1 and ClpP, suggesting that these declines are markers of an early age-mediated change that occurs within the chloroplast.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-97ER20280
- OSTI ID:
- 6479802
- Journal Information:
- Plant Physiology; (Bethesda), Vol. 119:4; ISSN 0032-0889
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AGE DEPENDENCE
ARABIDOPSIS
BIOLOGICAL FUNCTIONS
CHLOROPLASTS
GENES
MESSENGER-RNA
PEPTIDE HYDROLASES
PROTEINS
PROTEOLYSIS
CELL CONSTITUENTS
CHEMICAL REACTIONS
DECOMPOSITION
ENZYMES
HYDROLASES
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NUCLEIC ACIDS
ORGANIC COMPOUNDS
PLANTS
RNA
550200* - Biochemistry