Quantitative proteomics reveals extensive lysine ubiquitination and transcription factor stability states in Arabidopsis

Protein activity, abundance, and stability can be regulated by post-translational modification including ubiquitination. Ubiquitination is conserved among eukaryotes and plays a central role in modulating cellular function; yet, we lack comprehensive catalogs of proteins that are modified by ubiquit...

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Bibliographic Details
Published in:The Plant cell 2024-12, Vol.37 (1)
Main Authors: Song, Gaoyuan, Montes, Christian, Olatunji, Damilola, Malik, Shikha, Ji, Chonghui, Clark, Natalie M, Pu, Yunting, Kelley, Dior R, Walley, Justin W
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Gene Expression Regulation, Plant
Large-Scale Biology
Lysine - metabolism
Protein Stability
Proteomics - methods
Transcription Factors - genetics
Transcription Factors - metabolism
Ubiquitination
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Summary:Protein activity, abundance, and stability can be regulated by post-translational modification including ubiquitination. Ubiquitination is conserved among eukaryotes and plays a central role in modulating cellular function; yet, we lack comprehensive catalogs of proteins that are modified by ubiquitin in plants. In this study, we describe an antibody-based approach to enrich ubiquitinated peptides coupled with isobaric labeling to enable quantification of up to 18-multiplexed samples. This approach identified 17,940 ubiquitinated lysine sites arising from 6,453 proteins from Arabidopsis (Arabidopsis thaliana) primary roots, seedlings, and rosette leaves. Gene ontology analysis indicated that ubiquitinated proteins are associated with numerous biological processes including hormone signaling, plant defense, protein homeostasis, and metabolism. We determined ubiquitinated lysine residues that directly regulate the stability of three transcription factors, CRYPTOCHROME-INTERACTING BASIC-HELIX-LOOP-HELIX 1 (CIB1), CIB1 LIKE PROTEIN 2 (CIL2), and SENSITIVE TO PROTON RHIZOTOXICITY1 (STOP1) using in vivo degradation assays. Furthermore, codon mutation of CIB1 to create a K166R conversion to prevent ubiquitination, via CRISPR/Cas9-derived adenosine base editing, led to an early flowering phenotype and increased expression of FLOWERING LOCUS T (FT). These comprehensive site-level ubiquitinome profiles provide a wealth of data for future functional studies related to modulation of biological processes mediated by this post-translational modification in plants.
ISSN:1040-4651
1532-298X
1532-298X
DOI:10.1093/plcell/koae310