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  • 1
    Publication Date: 2006-07-11
    Description: The spindle checkpoint delays cell cycle progression until microtubules attach each pair of sister chromosomes to opposite poles of the mitotic spindle. Following sister chromatid separation, however, the checkpoint ignores chromosomes whose kinetochores are attached to only one spindle pole, a state that activates the checkpoint prior to metaphase. We demonstrate that, in budding yeast, mutual inhibition between the anaphase-promoting complex (APC) and Mps1, an essential component of the checkpoint, leads to sustained inactivation of the spindle checkpoint. Mps1 protein abundance decreases in anaphase, and Mps1 is a target of the APC. Furthermore, expression of Mps1 in anaphase, or repression of the APC in anaphase, reactivates the spindle checkpoint. This APC-Mps1 feedback circuit allows cells to irreversibly inactivate the checkpoint during anaphase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Palframan, William J -- Meehl, Janet B -- Jaspersen, Sue L -- Winey, Mark -- Murray, Andrew W -- GM43987/GM/NIGMS NIH HHS/ -- GM51312/GM/NIGMS NIH HHS/ -- R37 GM043987/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2006 Aug 4;313(5787):680-4. Epub 2006 Jul 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, Biological Laboratories, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16825537" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anaphase/*physiology ; Anaphase-Promoting Complex-Cyclosome ; Cdc20 Proteins ; Cell Cycle Proteins/metabolism ; Chromosomes, Fungal/physiology ; Feedback, Physiological ; GTP-Binding Proteins/metabolism ; Kinetochores/physiology ; Mad2 Proteins ; Mitosis ; Molecular Sequence Data ; Nuclear Proteins/metabolism ; Phosphorylation ; Protein-Serine-Threonine Kinases/genetics/*metabolism ; Protein-Tyrosine Kinases/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Saccharomyces cerevisiae/*cytology/metabolism ; Saccharomyces cerevisiae Proteins/genetics/*metabolism ; Securin ; Spindle Apparatus/*physiology ; Ubiquitin-Protein Ligase Complexes/*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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  • 2
    Publication Date: 2011-06-28
    Description: Centrosomes organize the bipolar mitotic spindle, and centrosomal defects cause chromosome instability. Protein phosphorylation modulates centrosome function, and we provide a comprehensive map of phosphorylation on intact yeast centrosomes (18 proteins). Mass spectrometry was used to identify 297 phosphorylation sites on centrosomes from different cell cycle stages. We observed different modes of phosphoregulation via specific protein kinases, phosphorylation site clustering, and conserved phosphorylated residues. Mutating all eight cyclin-dependent kinase (Cdk)-directed sites within the core component, Spc42, resulted in lethality and reduced centrosomal assembly. Alternatively, mutation of one conserved Cdk site within gamma-tubulin (Tub4-S360D) caused mitotic delay and aberrant anaphase spindle elongation. Our work establishes the extent and complexity of this prominent posttranslational modification in centrosome biology and provides specific examples of phosphorylation control in centrosome function.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3825980/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3825980/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keck, Jamie M -- Jones, Michele H -- Wong, Catherine C L -- Binkley, Jonathan -- Chen, Daici -- Jaspersen, Sue L -- Holinger, Eric P -- Xu, Tao -- Niepel, Mario -- Rout, Michael P -- Vogel, Jackie -- Sidow, Arend -- Yates, John R 3rd -- Winey, Mark -- F32 GM086038/GM/NIGMS NIH HHS/ -- GM51312/GM/NIGMS NIH HHS/ -- MOP-64404/Canadian Institutes of Health Research/Canada -- P41 RR011823/RR/NCRR NIH HHS/ -- R01 GM051312/GM/NIGMS NIH HHS/ -- R01 GM051312-16/GM/NIGMS NIH HHS/ -- R01 GM051312-16S1/GM/NIGMS NIH HHS/ -- R01 GM062427/GM/NIGMS NIH HHS/ -- R01 HG003039/HG/NHGRI NIH HHS/ -- T32 GM008759/GM/NIGMS NIH HHS/ -- U54 RR022220/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2011 Jun 24;332(6037):1557-61. doi: 10.1126/science.1205193.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21700874" target="_blank"〉PubMed〈/a〉
    Keywords: Binding Sites ; CDC2 Protein Kinase/metabolism ; *Cell Cycle ; Centrosome/*metabolism/ultrastructure ; Cytoskeletal Proteins/genetics/metabolism ; Fungal Proteins/chemistry/metabolism ; Fungi/metabolism ; G1 Phase ; Mitosis ; Mutation ; Phosphoproteins/genetics/metabolism ; Phosphorylation ; Protein Processing, Post-Translational ; Proteome/*metabolism ; Saccharomyces cerevisiae/cytology/genetics/growth & development/*metabolism ; Saccharomyces cerevisiae Proteins/chemistry/genetics/*metabolism ; Spindle Apparatus/metabolism/ultrastructure ; Tubulin/chemistry/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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  • 3
  • 4
    Publication Date: 2012-12-11
    Description: In virtually all eukaryotic cells, protein bridges formed by the conserved inner nuclear membrane SUN (for S ad1- UN C-84) domain-containing proteins and their outer nuclear membrane binding partners span the nuclear envelope (NE) to connect the nucleoplasm and cytoplasm. These linkages are important for chromosome movements within the nucleus during meiotic prophase and are essential for nuclear migration and centrosome attachment to the NE. In Saccharomyces cerevisiae , MPS3 encodes the sole SUN protein. Deletion of MPS3 or the conserved SUN domain is lethal in three different genetic backgrounds. Mutations in the SUN domain result in defects in duplication of the spindle pole body, the yeast centrosome-equivalent organelle. A genome-wide screen for mutants that exhibited synthetic fitness defects in combination with mps3 SUN domain mutants yielded a large number of hits in components of the spindle apparatus and the spindle checkpoint. Mutants in lipid metabolic processes and membrane organization also exacerbated the growth defects of mps3 SUN domain mutants, pointing to a role for Mps3 in nuclear membrane organization. Deletion of SLP1 or YER140W / EMP65 (for ER membrane protein of 65 kDa) aggravated growth of mps3 SUN domain mutants. Slp1 and Emp65 form an ER-membrane associated protein complex that is not required directly for spindle pole body duplication or spindle assembly. Rather, Slp1 is involved in Mps3 localization to the NE.
    Electronic ISSN: 2160-1836
    Topics: Biology
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  • 5
    Publication Date: 2013-03-27
    Description: Drosophila melanogaster Polo kinase physically interacts with, and is repressed by, the Matrimony (Mtrm) protein during oogenesis. Females heterozygous for a deletion of the mtrm gene display defects in chromosome segregation at meiosis I. However, a complete absence of Mtrm results in both meiotic catastrophe and female sterility. We show...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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