The Caseinolytic Protease Complex Component CLPC1 in Arabidopsis Maintains Proteome and RNA Homeostasis in Chloroplasts

Overview

Journal BMC Plant Biol

Publisher Biomed Central

Specialty Biology

Date 2018 Sep 14

PMID 30208840

Citations 4

Authors

Shoudong Zhang

Huoming Zhang

Yiji Xia

Liming Xiong

Affiliations

Soon will be listed here.

Abstract

Background: Homeostasis of the proteome is critical to the development of chloroplasts and also affects the expression of certain nuclear genes. CLPC1 facilitates the translocation of chloroplast pre-proteins and mediates protein degradation.

Results: We found that proteins involved in photosynthesis are dramatically decreased in their abundance in the clpc1 mutant, whereas many proteins involved in chloroplast transcription and translation were increased in the mutant. Expression of the full-length CLPC1 protein, but not of the N-terminus-deleted CLPC1 (ΔN), in the clpc1 mutant background restored the normal levels of most of these proteins. Interestingly, the ΔN complementation line could also restore some proteins affected by the mutation to normal levels. We also found that that the clpc1 mutation profoundly affects transcript levels of chloroplast genes. Sense transcripts of many chloroplast genes are up-regulated in the clpc1 mutant. The level of SVR7, a PPR protein, was affected by the clpc1 mutation. We showed that SVR7 might be a target of CLPC1 as CLPC1-SVR7 interaction was detected through co-immunoprecipitation.

Conclusion: Our study indicates that in addition to its role in maintaining proteome homeostasis, CLPC1 and likely the CLP proteasome complex also play a role in transcriptome homeostasis through its functions in maintaining proteome homeostasis.

Citing Articles

The Arabidopsis PeptideAtlas: Harnessing worldwide proteomics data to create a comprehensive community proteomics resource.

van Wijk K, Leppert T, Sun Q, Boguraev S, Sun Z, Mendoza L Plant Cell. 2021; 33(11):3421-3453.

PMID: 34411258 PMC: 8566204. DOI: 10.1093/plcell/koab211.

Plastid caseinolytic protease OsClpR1 regulates chloroplast development and chloroplast RNA editing in rice.

Liu X, Xu Z, Yang Y, Cao P, Cheng H, Zhou H Rice (N Y). 2021; 14(1):45.

PMID: 34018050 PMC: 8137786. DOI: 10.1186/s12284-021-00489-6.

Molecular insights into plant desiccation tolerance: transcriptomics, proteomics and targeted metabolite profiling in Craterostigma plantagineum.

Xu X, Legay S, Sergeant K, Zorzan S, Leclercq C, Charton S Plant J. 2021; 107(2):377-398.

PMID: 33901322 PMC: 8453721. DOI: 10.1111/tpj.15294.

OsNBL1, a Multi-Organelle Localized Protein, Plays Essential Roles in Rice Senescence, Disease Resistance, and Salt Tolerance.

Zhao X, Zhang T, Feng H, Qiu T, Li Z, Yang J Rice (N Y). 2021; 14(1):10.

PMID: 33423130 PMC: 7797018. DOI: 10.1186/s12284-020-00450-z.

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