期刊
JOURNAL OF PROTEOME RESEARCH
卷 13, 期 7, 页码 3223-3230出版社
AMER CHEMICAL SOC
DOI: 10.1021/pr401245g
关键词
26S proteasome; Arabidopsis thaliana; proteomic analysis; transit peptide; yeast two-hybrid assay
资金
- Nara Institute of Science and Technology
- MEXT
- Mitsubishi Foundation
- KAKENHI from JSPS [23380198, 25440057, 24114701, 25112501]
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [12J07285, 26660046, 26292188, 23380198, 25112501, 25440057, 24114701] Funding Source: KAKEN
The 26S proteasome is an ATP-dependent proteinase complex that is responsible for regulated proteolysis of polyubiquitinated proteins in eukaryotic cells. Here, we report novel 26S proteasome interacting proteins in Arabidopsis as revealed by LC-MS/MS analysis. We performed a two-step screening process that involved affinity purification of the 26S proteasome using Arabidopsis plants expressing a FLAG-tagged RPT2a subunit and partial purification of the 26S proteasome from cultured cells by glycerol density gradient centrifugation (GDG). Two plastid proteins, LTA2 and PDH E1 alpha, which were commonly identified by both affinity purification and GDG, interacted with the 26S proteasome both in vitro and in vivo, and the transit peptides of LTA2 and PDH E1 alpha were necessary for the interaction. Furthermore, the degradation of both LTA2 and PDH E1 alpha was inhibited by MG132, a proteasome inhibitor. Similar to those two proteins, 26S proteasome subunits RPT2a/b and RPT5a interacted with the transit peptides of three other chloroplast proteins, which are known to be substrates of the ubiquitin-26S proteasome system. These results suggest that a direct interaction between the 26S proteasome and a transit peptide is important for the degradation of unimported plastid protein precursors to maintain cellular homeostasis.
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