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The Cyclin CYCA3;4 Is a Postprophase Target of the APC/C CCS52A2 E3-Ligase Controlling Formative Cell Divisions in Arabidopsis.
- Source :
-
The Plant cell [Plant Cell] 2020 Sep; Vol. 32 (9), pp. 2979-2996. Date of Electronic Publication: 2020 Jul 20. - Publication Year :
- 2020
-
Abstract
- The anaphase promoting complex/cyclosome (APC/C) controls unidirectional progression through the cell cycle by marking key cell cycle proteins for proteasomal turnover. Its activity is temporally regulated by the docking of different activating subunits, known in plants as CELL DIVISION PROTEIN20 (CDC20) and CELL CYCLE SWITCH52 (CCS52). Despite the importance of the APC/C during cell proliferation, the number of identified targets in the plant cell cycle is limited. Here, we used the growth and meristem phenotypes of Arabidopsis ( Arabidopsis thaliana ) CCS52A2-deficient plants in a suppressor mutagenesis screen to identify APC/C <superscript>CCS52A2</superscript> substrates or regulators, resulting in the identification of a mutant cyclin CYCA3;4 allele. CYCA3;4 deficiency partially rescues the ccs52a2-1 phenotypes, whereas increased CYCA3;4 levels enhance the scored ccs52a2-1 phenotypes. Furthermore, whereas the CYCA3;4 protein is promptly broken down after prophase in wild-type plants, it remains present in later stages of mitosis in ccs52a2-1 mutant plants, marking it as a putative APC/C <superscript>CCS52A2</superscript> substrate. Strikingly, increased CYCA3;4 levels result in aberrant root meristem and stomatal divisions, mimicking phenotypes of plants with reduced RETINOBLASTOMA-RELATED PROTEIN1 (RBR1) activity. Correspondingly, RBR1 hyperphosphorylation was observed in CYCA3;4 gain-of-function plants. Our data thus demonstrate that an inability to timely destroy CYCA3;4 contributes to disorganized formative divisions, possibly in part caused by the inactivation of RBR1.<br /> (© 2020 American Society of Plant Biologists. All rights reserved.)
- Subjects :
- Arabidopsis drug effects
Arabidopsis genetics
Arabidopsis metabolism
Arabidopsis Proteins genetics
Cell Cycle Proteins genetics
Cell Differentiation genetics
Cell Division
Ethyl Methanesulfonate pharmacology
Gene Expression Regulation, Plant
Meristem cytology
Meristem genetics
Mutation
Phosphorylation
Plant Cells drug effects
Plant Leaves cytology
Plant Leaves genetics
Plant Roots cytology
Plant Roots genetics
Plant Stems cytology
Plants, Genetically Modified
Polymorphism, Single Nucleotide
Arabidopsis cytology
Arabidopsis Proteins metabolism
Cell Cycle Proteins metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1532-298X
- Volume :
- 32
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- The Plant cell
- Publication Type :
- Academic Journal
- Accession number :
- 32690720
- Full Text :
- https://doi.org/10.1105/tpc.20.00208