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  • 1
    Publication Date: 1998-03-07
    Description: The spindle checkpoint regulates the cell division cycle by keeping cells with defective spindles from leaving mitosis. In the two-hybrid system, three proteins that are components of the checkpoint, Mad1, Mad2, and Mad3, were shown to interact with Cdc20, a protein required for exit from mitosis. Mad2 and Mad3 coprecipitated with Cdc20 at all stages of the cell cycle. The binding of Mad2 depended on Mad1 and that of Mad3 on Mad1 and Mad2. Overexpression of Cdc20 allowed cells with a depolymerized spindle or damaged DNA to leave mitosis but did not overcome the arrest caused by unreplicated DNA. Mutants in Cdc20 that were resistant to the spindle checkpoint no longer bound Mad proteins, suggesting that Cdc20 is the target of the spindle checkpoint.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hwang, L H -- Lau, L F -- Smith, D L -- Mistrot, C A -- Hardwick, K G -- Hwang, E S -- Amon, A -- Murray, A W -- New York, N.Y. -- Science. 1998 Feb 13;279(5353):1041-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of California at San Francisco, San Francisco, CA 94143-0444, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9461437" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anaphase ; Anaphase-Promoting Complex-Cyclosome ; Cadherins ; Calcium-Binding Proteins/metabolism ; *Carrier Proteins ; Cdc20 Proteins ; Cdh1 Proteins ; Cell Cycle Proteins/chemistry/genetics/*metabolism ; DNA Damage ; DNA Replication ; Fungal Proteins/chemistry/*metabolism ; Ligases/metabolism ; Mad2 Proteins ; *Mitosis ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/metabolism ; Phosphoproteins/metabolism ; *Repressor Proteins ; Saccharomyces cerevisiae/*cytology/*metabolism ; *Saccharomyces cerevisiae Proteins ; Spindle Apparatus/*metabolism ; *Ubiquitin-Protein Ligase Complexes ; Ubiquitin-Protein Ligases
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2005-08-16
    Description: Mesenchymal stem cells (MSCs) are a pluripotent cell type that can differentiate into several distinct lineages. Two key transcription factors, Runx2 and peroxisome proliferator-activated receptor gamma (PPARgamma), drive MSCs to differentiate into either osteoblasts or adipocytes, respectively. How these two transcription factors are regulated in order to specify these alternate cell fates remains a pivotal question. Here we report that a 14-3-3-binding protein, TAZ (transcriptional coactivator with PDZ-binding motif), coactivates Runx2-dependent gene transcription while repressing PPARgamma-dependent gene transcription. By modulating TAZ expression in model cell lines, mouse embryonic fibroblasts, and primary MSCs in culture and in zebrafish in vivo, we observed alterations in osteogenic versus adipogenic potential. These results indicate that TAZ functions as a molecular rheostat that modulates MSC differentiation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hong, Jeong-Ho -- Hwang, Eun Sook -- McManus, Michael T -- Amsterdam, Adam -- Tian, Yu -- Kalmukova, Ralitsa -- Mueller, Elisabetta -- Benjamin, Thomas -- Spiegelman, Bruce M -- Sharp, Phillip A -- Hopkins, Nancy -- Yaffe, Michael B -- CA042063/CA/NCI NIH HHS/ -- GM60594/GM/NIGMS NIH HHS/ -- GM68762/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2005 Aug 12;309(5737):1074-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Cancer Research, Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, E18-580, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16099986" target="_blank"〉PubMed〈/a〉
    Keywords: Adipocytes/*cytology ; Animals ; Bone Morphogenetic Protein 2 ; Bone Morphogenetic Proteins/pharmacology ; Cell Differentiation ; Cell Line ; Core Binding Factor Alpha 1 Subunit ; Gene Expression Regulation, Developmental ; Humans ; Mesenchymal Stromal Cells/*cytology/physiology ; Mice ; Neoplasm Proteins/metabolism ; Oligonucleotides, Antisense ; Osteoblasts/*cytology ; Osteocalcin/genetics ; Osteogenesis ; PPAR gamma/metabolism ; Promoter Regions, Genetic ; Protein Structure, Tertiary ; Proteins/chemistry/genetics/*physiology ; RNA, Small Interfering ; Transcription Factors/chemistry/genetics/metabolism/*physiology ; Transcriptional Activation ; Transfection ; Transforming Growth Factor beta/pharmacology ; Zebrafish ; Zebrafish Proteins/genetics/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2005-01-22
    Description: Cell lineage specification depends on both gene activation and gene silencing, and in the differentiation of T helper progenitors to Th1 or Th2 effector cells, this requires the action of two opposing transcription factors, T-bet and GATA-3. T-bet is essential for the development of Th1 cells, and GATA-3 performs an equivalent role in Th2 development. We report that T-bet represses Th2 lineage commitment through tyrosine kinase-mediated interaction between the two transcription factors that interferes with the binding of GATA-3 to its target DNA. These results provide a novel function for tyrosine phosphorylation of a transcription factor in specifying alternate fates of a common progenitor cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hwang, Eun Sook -- Szabo, Susanne J -- Schwartzberg, Pamela L -- Glimcher, Laurie H -- AI48126/AI/NIAID NIH HHS/ -- AI56296/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2005 Jan 21;307(5708):430-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15662016" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Lineage ; Cytokines/pharmacology/physiology ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; GATA3 Transcription Factor ; Interleukin-5/genetics ; Mice ; Mice, Inbred BALB C ; Mutation ; Phosphorylation ; Phosphotyrosine/metabolism ; Promoter Regions, Genetic ; Protein Structure, Tertiary ; Protein-Tyrosine Kinases/metabolism ; T-Box Domain Proteins ; T-Lymphocytes, Helper-Inducer/cytology/*physiology ; Th1 Cells/cytology/physiology ; Th2 Cells/cytology/*physiology ; Trans-Activators/chemistry/genetics/*metabolism ; Transcription Factors/chemistry/genetics/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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