ArticleThe Plant cell2023
Inhibition of SIZ1-mediated SUMOylation of HOOKLESS1 promotes light-induced apical hook opening in Arabidopsis.
Article in The Plant cell, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 14 citations in OpenAlex.
- SIZ1-mediated SUMOylation of HAT1 enhances plant thermotolerance in Arabidopsis.The Plant journal : for cell and molecular biology · 2026Article
- Light interacts with mechanical stress to regulate the seed-to-seedling transition.Stress biology · 2025Review
- Article
- Bending over backwards for soil emergence: KIPK and KIPK-LIKE1 regulate hypocotyl gravitropic growth.The Plant cell · 2025Article
- Retromer protein VPS29 plays a crucial and positive role in the sumoylation system mediated by E3 SUMO ligase SIZ1.The Plant journal : for cell and molecular biology · 2025Article
- Extranuclear function of Arabidopsis HOOKLESS1 regulates pleiotropic developmental processes in a non-cell-autonomous manner.The New phytologist · 2025Article
- Ubiquitin-specific protease UBP14 stabilizes HY5 by deubiquitination to promote photomorphogenesis inProceedings of the National Academy of Sciences of the United States of America · 2024Article
- A nonsynonymous mutation in BhLS, encoding an acyl-CoA N-acyltransferase leads to fruit and seed size variation in wax gourd (Benincasa hispida).TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2024Article
- The Role of Light Quality in Regulating Early Seedling Development.Plants (Basel, Switzerland) · 2023Review
- The origin, evolution and functional divergence of HOOKLESS1 in plants.Communications biology · 2023Article
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Authors and funding
6 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The apical hook protects cotyledons and the shoot apical meristem from mechanical injuries during seedling emergence from the soil. HOOKLESS1 (HLS1) is a central regulator of apical hook development, as a terminal signal onto which several pathways converge. However, how plants regulate the rapid opening of the apical hook in response to light by modulating HLS1 function remains unclear. In this study, we demonstrate that the small ubiquitin-like modifier (SUMO) E3 ligase SAP AND MIZ1 DOMAIN-CONTAINING LIGASE1 (SIZ1) interacts with HLS1 and mediates its SUMOylation in Arabidopsis thaliana. Mutating SUMO attachment sites of HLS1 results in impaired function of HLS1, indicating that HLS1 SUMOylation is essential for its function. SUMOylated HLS1 was more likely to assemble into oligomers, which are the active form of HLS1. During the dark-to-light transition, light induces rapid apical hook opening, concomitantly with a drop in SIZ1 transcript levels, resulting in lower HLS1 SUMOylation. Furthermore, ELONGATED HYPOCOTYL5 (HY5) directly binds to the SIZ1 promoter and suppresses its transcription. HY5-initiated rapid apical hook opening partially depended on HY5 inhibition of SIZ1 expression. Taken together, our study identifies a function for SIZ1 in apical hook development, providing a dynamic regulatory mechanism linking the post-translational modification of HLS1 during apical hook formation and light-induced apical hook opening.
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