ArticleThe Plant cell2024
CHLOROPLAST UNUSUAL POSITIONING 1 is a plant-specific actin polymerization factor regulating chloroplast movement.
Article in The Plant cell, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.
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Who cites it
16 citing papers in PubMed, 23 citations in OpenAlex.
- Lights out: PP2C phosphatases reset phototropin signaling in darkness.The Plant cell · 2026Article
- PERSPECTIVE: organelle positioning as a principle of metabolic regulation and stress tolerance.The Plant journal : for cell and molecular biology · 2026Review
- Genome-wide association in quality protein maize: identifying key loci for yield enhancement.Journal of applied genetics · 2026Article
- Multifactorial analysis of simultaneous organelle movement reveals cell-specific motility of peroxisomes and mitochondria.Plant physiology · 2026Article
- Integrative QTL mapping and RNA-seq unravel the genetic architecture and candidate genes for ear shank length in a large maize-teosinte population.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025Article
- Mechanisms underpinning natural variation in non-photochemical quenching kinetics.Biochemical Society transactions · 2025Review
- Optimal disk packing of chloroplasts in plant cells.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Let's keep in touch: How membrane contact sites drive immune responses.The Plant cell · 2025Article
- GLR Channels Are Involved in the Mechanism of Chloroplast Avoidance Response inPlants (Basel, Switzerland) · 2025Article
- Membrane contact sites between chloroplasts and the pathogen interface underpin plant focal immune responses.The Plant cell · 2025Article
- Article
- Evolutionary diversification of C2 photosynthesis in the grass genus Homolepis (Arthropogoninae).Annals of botany · 2025Article
- Comprehensive characterization of poplar HSP20 gene family: genome-wide identification, stress-induced expression profiling, and protein interaction verifications.BMC plant biology · 2025Article
- Multiple Mechanisms to Regulate Actin Functions: "Fundamental" Versus Lineage-Specific Mechanisms and Hierarchical Relationships.Biomolecules · 2025Review
- Recovery of the cortical chloroplast layer in the green algaFrontiers in plant science · 2025Article
- CHUP1 restricts chloroplast movement and effector-triggered immunity in epidermal cells.The New phytologist · 2024Article
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Authors and funding
16 authors at 5 institutions in 2 countries.
Funding
Abstract
Plants have unique responses to fluctuating light conditions. One such response involves chloroplast photorelocation movement, which optimizes photosynthesis under weak light by the accumulation of chloroplasts along the periclinal side of the cell, which prevents photodamage under strong light by avoiding chloroplast positioning toward the anticlinal side of the cell. This light-responsive chloroplast movement relies on the reorganization of chloroplast actin (cp-actin) filaments. Previous studies have suggested that CHLOROPLAST UNUSUAL POSITIONING 1 (CHUP1) is essential for chloroplast photorelocation movement as a regulator of cp-actin filaments. In this study, we conducted comprehensive analyses to understand CHUP1 function. Functional, fluorescently tagged CHUP1 colocalized with and was coordinately reorganized with cp-actin filaments on the chloroplast outer envelope during chloroplast movement in Arabidopsis thaliana. CHUP1 distribution was reversibly regulated in a blue light- and phototropin-dependent manner. X-ray crystallography revealed that the CHUP1-C-terminal domain shares structural homology with the formin homology 2 (FH2) domain, despite lacking sequence similarity. Furthermore, the CHUP1-C-terminal domain promoted actin polymerization in the presence of profilin in vitro. Taken together, our findings indicate that CHUP1 is a plant-specific actin polymerization factor that has convergently evolved to assemble cp-actin filaments and enables chloroplast photorelocation movement.
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