Journal
PLANT CELL
Volume 27, Issue 10, Pages 2677-2691Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.15.00574
Keywords
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Funding
- National Science Foundation [MCB1021963]
- German Research Foundation (Deutsche Forschungsgemeinschaft) [GR936 15-1]
- Grants-in-Aid for Scientific Research [15J03092] Funding Source: KAKEN
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Clp proteases are found in prokaryotes, mitochondria, and plastids where they play crucial roles in maintaining protein homeostasis (proteostasis). The plant plastid Clp machinery comprises a hetero-oligomeric ClpPRT proteolytic core, ATP-dependent chaperones ClpC and ClpD, and an adaptor protein, ClpS1. ClpS1 selects substrates to the ClpPR protease-ClpC chaperone complex for degradation, but the underlying substrate recognition and delivery mechanisms are currently unclear. Here, we characterize a ClpS1-interacting protein in Arabidopsis thaliana, ClpF, which can interact with the Clp substrate glutamyl-tRNA reductase. ClpF and ClpS1 mutually stimulate their association with ClpC. ClpF, which is only found in photosynthetic eukaryotes, contains bacterial uvrB/C and YccV protein domains and a unique N-terminal domain. We propose a testable model in which ClpS1 and ClpF form a binary adaptor for selective substrate recognition and delivery to ClpC, reflecting an evolutionary adaptation of the Clp system to the plastid proteome.
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