Ubiquitin-Related Mechanisms in Plant Development

Ubiquitin-mediated processes lie at the heart of plant growth, development and environmental response. The reversible conjugation of ubiquitin to target proteins orchestrates their stability, activity and interactions, thus fine-tuning signalling pathways that govern cell division, differentiation, hormone perception and stress adaptation. Central to this system are E3 ubiquitin ligases, which confer substrate specificity, and deubiquitinases that remove ubiquitin marks to recycle ubiquitin and reset protein function. In plants, multisubunit complexes such as SCF (SKP1-CULLIN1-F-box) and CULLIN3-based ligases regulate hormone signalling modules—most notably auxin, gibberellin and abscisic acid pathways—as well as photomorphogenesis and circadian rhythms. Parallel to proteolytic roles, monoubiquitination of histone H2B and H2A acts as an epigenetic mark that modulates transcriptional elongation and chromatin dynamics during developmental transitions. The COP9 signalosome integrates environmental cues by deneddylating cullins, thereby gating E3 ligase activation. Together, these ubiquitin-related mechanisms ensure precise spatial and temporal control of gene expression and protein turnover, underpinning plant architecture, flowering time, seed germination and stress resilience. Advances in elucidating enzyme-substrate networks and co-repressor complexes have opened avenues for crop engineering, where targeted manipulation of ubiquitin pathways can enhance yield, nutrient use efficiency and tolerance to abiotic stress.

Research from Nature Portfolio

Recent studies have revealed a co-repressor complex formed by a histone deubiquitinase and a DNA-binding protein that orchestrates growth-related gene expression. In Arabidopsis, OTLD1, an ovarian tumour-type deubiquitinase that removes monoubiquitin from histone H2B, lacks intrinsic DNA-binding capacity. It was shown to interact with the transcription factor LSH10, which recruits OTLD1 to specific promoter regions. Loss of LSH10 disrupts OTLD1-mediated repression, leading to elevated expression of genes involved in cell expansion and hormone signalling, whereas restoration of LSH10 restores histone deubiquitination and transcriptional silencing. This work defines a general mechanism by which plant histone deubiquitinases achieve specificity at target loci through partnership with ALOG family transcription factors, linking epigenetic modification to developmental gene regulation.

Ubiquitin-Related Mechanisms in Plant Development publication trend

The graph below shows the total number of articles in ubiquitin-related mechanisms in plant development across all publications each year (not limited to Nature Index journals).

Technical terms

Ubiquitination: Covalent attachment of ubiquitin to lysine residues of a substrate protein, influencing its fate or function.

E3 ubiquitin ligase: Enzyme that recognises specific substrates and catalyses transfer of ubiquitin from an E2 conjugating enzyme.

Deubiquitinase (DUB): Protease that removes ubiquitin moieties from proteins or ubiquitin precursors, restoring substrate function and free ubiquitin pools.

SCF complex: A CULLIN1-based E3 ligase composed of SKP1, CULLIN1, an F-box protein and RBX1, central to hormone signalling and proteostasis.

COP9 signalosome: Multi-subunit complex that deneddylates CULLIN scaffolds, regulating activation cycles of cullin-RING E3 ligases.

References

1. COP9 signalosome-mediated deneddylation of CULLIN1 is necessary for SCFEBF1 assembly in Arabidopsis thaliana. Cell Reports (2024).
2. Arabidopsis LSH10 transcription factor and OTLD1 histone deubiquitinase interact and transcriptionally regulate the same target genes. Communications Biology (2023).
3. Deubiquitylating enzymes and their emerging role in plant biology. Frontiers in Plant Science (2014).