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Author Kim, Youn-Sung ♦ Kim, Sang-Gyu ♦ Park, Jung-Eun ♦ Park, Hye-Young ♦ Lim, Mi-Hye ♦ Chua, Nam-Hai ♦ Park, Chung-Mo
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher American Society of Plant Biologists
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Genetics and evolution ♦ Natural history of organisms ♦ Technology ♦ Medicine & health ♦ Human anatomy, cytology, histology ♦ Human physiology ♦ Pharmacology and therapeutics ♦ Diseases ♦ Manufacture for specific uses ♦ Precision instruments & other devices
Subject Domain (in MeSH) Cells ♦ Plant Structures ♦ Anatomy ♦ Eukaryota ♦ Organisms ♦ Heterocyclic Compounds ♦ Amino Acids, Peptides, and Proteins ♦ Chemicals and Drugs ♦ Investigative Techniques ♦ Analytical, Diagnostic and Therapeutic Techniques and Equipment ♦ Physical Phenomena ♦ Chemical Phenomena ♦ Cell Physiological Phenomena ♦ Genetic Phenomena ♦ Biological Sciences
Subject Keyword Discipline Botany ♦ Arabidopsis Proteins ♦ Metabolism ♦ Arabidopsis ♦ Cytology ♦ Cell Division ♦ Cell Membrane ♦ Transcription Factors ♦ Genetics ♦ Growth & Development ♦ Ultrastructure ♦ Secretion ♦ Biomechanical Phenomena ♦ Drug Effects ♦ Chromosome Mapping ♦ Chromosomes, Plant ♦ Cytokinins ♦ Pharmacology ♦ Gene Expression ♦ Hypocotyl ♦ Intracellular Membranes ♦ Membrane Proteins ♦ Models, Biological ♦ Mutation ♦ Phenotype ♦ Plant Leaves ♦ Plants, Genetically Modified ♦ Protein Processing, Post-translational ♦ Seedling ♦ Signal Transduction ♦ Thermodynamics ♦ Journal Article ♦ Research Support, Non-u.s. Gov't
Abstract Controlled release of membrane-tethered, dormant precursors is an intriguing activation mechanism that regulates diverse cellular functions in eukaryotes. An exquisite example is the proteolytic activation of membrane-bound transcription factors. The proteolytic cleavage liberates active transcription factors from the membranes that can enter the nucleus and evokes rapid transcriptional responses to incoming stimuli. Here, we show that a membrane-bound NAC (for NAM, ATAF1/2, CUC2) transcription factor, designated NTM1 (for NAC with transmembrane motif1), is activated by proteolytic cleavage through regulated intramembrane proteolysis and mediates cytokinin signaling during cell division in Arabidopsis thaliana. Cell proliferation was greatly reduced in an Arabidopsis mutant with retarded growth and serrated leaves in which a transcriptionally active NTM1 form was constitutively expressed. Accordingly, a subset of cyclin-dependent kinase (CDK) inhibitor genes (the KIP-related proteins) was induced in this mutant with a significant reduction in histone H4 gene expression and in CDK activity. Consistent with a role for NTM1 in cell cycling, a Ds element insertional mutant was morphologically normal but displayed enhanced hypocotyl growth with accelerated cell division. Interestingly, cytokinins were found to regulate NTM1 activity by controlling its stability. These results indicate that the membrane-mediated activation of NTM1 defines a molecular mechanism by which cytokinin signaling is tightly regulated during cell cycling.
Description Author Affiliation: Kim YS ( Department of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-742, Korea.)
ISSN 10404651
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2006-11-01
Publisher Place United States
e-ISSN 1531298X
Volume Number 18
Issue Number 11

Source: WHO-Global Index Medicus