期刊
FEBS LETTERS
卷 593, 期 9, 页码 962-970出版社
WILEY
DOI: 10.1002/1873-3468.13378
关键词
adaptor; Arabidopsis thaliana; chloroplast; ClpS1; N-degron; protease
资金
- National Science Foundation, MCB [1614629]
- Swiss National Science Foundation (SNF)
- Australian Research Council (ARC) [DP110103936]
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [1614629] Funding Source: National Science Foundation
The prokaryotic N-degron pathway depends on the Clp chaperone-protease system and the ClpS adaptor for recognition of N-degron bearing substrates. Plant chloroplasts contain a diversified Clp protease, including the ClpS homolog ClpS1. Several candidate ClpS1 substrates have been identified, but the N-degron specificity is unclear. Here, we employed in vitro ClpS1 affinity assays using eight N-degron green fluorescence protein reporters containing either F, Y, L, W, I, or R in the N-terminal position. This demonstrated that ClpS1 has a restricted N-degron specificity, recognizing proteins bearing an N-terminal F or W, only weakly recognizing L, but not recognizing Y or I. This affinity is dependent on two conserved residues in the ClpS1 binding pocket and is sensitive to FR dipeptide competition, suggesting a unique chloroplast N-degron pathway.
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