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The anaphase-promoting complex/cyclosome (APC/C) represents a large multisubunit E3-ubiquitin ligase complex that controls the unidirectional progression through the cell cycle by the ubiquitination of specific target proteins, marking them for proteasomal destruction. Although the APC/C's role is largely conserved among eukaryotes, its subunit composition and target spectrum appear to be species specific. In this review, we focus on the plant APC/C complex, whose activity correlates with different developmental processes, including polyploidization and gametogenesis. After an introduction into proteolytic control by ubiquitination, we discuss the composition of the plant APC/C and the essential nature of its core subunits for plant development. Subsequently, we describe the APC/C activator subunits and interactors, most being plant specific. Finally, we provide a comprehensive list of confirmed and suspected plant APC/C target proteins. Identification of growth-related targets might offer opportunities to increase crop yield and resilience of plants to climate change by manipulating APC/C activity.
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http://dx.doi.org/10.1146/annurev-cellbio-120420-092421 | DOI Listing |
Plant J
August 2025
Chongqing Key Laboratory of Crop Molecular Improvement, Rice Research Institute, Academy of Agricultural Sciences, College of Agronomy and Biotechnology, Southwest University, Chongqing, 400715, China.
Grain size is a pivotal factor that significantly influences grain yield. However, the genetic basis is mostly unknown. Here, we found that our previously identified wl1 mutant, which regulates leaf width development through the APC/C-WL1-NAL1 pathway, also exhibits a wide grain phenotype with increased cell expansion and proliferation in glume.
View Article and Find Full Text PDFPlant Cell
July 2025
Kinetochore Biology, Department of Breeding Research, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) OT Gatersleben, Corrensstr 3, Seeland 06466, Germany.
Kinetochores are large protein complexes that serve as attachment sites for spindle microtubules, ensuring proper chromosome segregation during cell division. KINETOCHORE NULL2 (αKNL2) is a key kinetochore protein required for the incorporation of the centromeric histone variant CENH3. The precise regulation of αKNL2 levels is crucial, but the molecular mechanisms controlling this process remain largely unexplored.
View Article and Find Full Text PDFPlant Biotechnol J
September 2025
Departamento de Ciências Biológicas, Escola Superior de Agricultura 'Luiz de Queiroz' (ESALQ), University of São Paulo (USP), Piracicaba, Brazil.
The Anaphase-Promoting Complex/Cyclosome (APC/C) is an E3 ubiquitin ligase that plays a crucial role in ubiquitin-dependent proteolysis of key cell cycle regulators, which is completed by the 26S proteasome. Previously, SAMBA, a plant-specific regulator of the APC/C, was identified in Arabidopsis as a critical factor controlling organ size through the regulation of cell proliferation. Here, by assessing its role in the crop tomato (Solanum lycopersicum), we confirm that SAMBA is a conserved APC/C regulator in plants and shows additional roles, including the modulation of fruit shape and changes in sugar metabolism.
View Article and Find Full Text PDFPlant Cell
June 2025
Guangdong Basic Research Center of Excellence for Precise Breeding of Future Crops, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory for the Development Biology and Environmental Adaptation of Agricultural Organisms, College of Life Sciences, South China Agric
Faithful chromosome segregation is essential for both mitotic and meiotic cell division. The anaphase-promoting complex/cyclosome (APC/C) and its coactivators are required for meiotic chromosome segregation, but their potential targets and regulatory mechanisms remain unclear in plants. Here, we performed a ubiquitinome analysis and show that Arabidopsis thaliana Aurora 1 (AUR1) is over-ubiquitinated at lysine 102 in the coactivator Cell Division Cycle 20.
View Article and Find Full Text PDFJ Plant Res
July 2025
Department of Life Sciences, School of Agriculture, Meiji University, Kawasaki, Kanagawa, 214-8571, Japan.
Living organisms are constantly at the risk of DNA damage caused by factors such as DNA replication errors, reactive oxygen species, and UV radiation. In plants, DNA damage activates the NAC-type transcription factor SUPPRESSOR OF GAMMA RESPONSE 1 (SOG1) that governs DNA damage responses such as cell cycle arrest, stem cell death, and early onset of endoreplication. However, molecular mechanisms underlying the early induction of endoreplication onset in response to DNA damage remain elusive.
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