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  • 1
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    TRP-PLIK, a bifunctional protein with kinase and ion channel activities (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-02-13
    Description: We cloned and characterized a protein kinase and ion channel, TRP-PLIK. As part of the long transient receptor potential channel subfamily implicated in control of cell division, it is a protein that is both an ion channel and a protein kinase. TRP-PLIK phosphorylated itself, displayed a wide tissue distribution, and, when expressed in CHO-K1 cells, constituted a nonselective, calcium-permeant, 105-picosiemen, steeply outwardly rectifying conductance. The zinc finger containing alpha-kinase domain was functional. Inactivation of the kinase activity by site-directed mutagenesis and the channel's dependence on intracellular adenosine triphosphate (ATP) demonstrated that the channel's kinase activity is essential for channel function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Runnels, L W -- Yue, L -- Clapham, D E -- New York, N.Y. -- Science. 2001 Feb 9;291(5506):1043-7. Epub 2001 Jan 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Cardiology, Department of Neurobiology, Harvard Medical School, 1309 Enders Building, 320 Longwood Avenue, Children's Hospital, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11161216" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; CHO Cells ; Calcium/metabolism ; Catalytic Domain ; Cations/metabolism ; Cell Line ; Cricetinae ; DNA, Complementary ; Electric Conductivity ; Humans ; Ion Channels/chemistry/*genetics/*metabolism ; *Membrane Proteins ; Mice ; Molecular Sequence Data ; Mutation ; Myelin Basic Protein/metabolism ; Patch-Clamp Techniques ; Phosphorylation ; Protein Kinases/chemistry/*genetics/*metabolism ; Protein-Serine-Threonine Kinases ; Rats ; Recombinant Fusion Proteins/chemistry/metabolism ; TRPM Cation Channels ; Transfection ; Two-Hybrid System Techniques ; Type C Phospholipases/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    A prokaryotic voltage-gated sodium channel (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-12-18
    Description: The pore-forming subunits of canonical voltage-gated sodium and calcium channels are encoded by four repeated domains of six-transmembrane (6TM) segments. We expressed and characterized a bacterial ion channel (NaChBac) from Bacillus halodurans that is encoded by one 6TM segment. The sequence, especially in the pore region, is similar to that of voltage-gated calcium channels. The expressed channel was activated by voltage and was blocked by calcium channel blockers. However, the channel was selective for sodium. The identification of NaChBac as a functionally expressed bacterial voltage-sensitive ion-selective channel provides insight into both voltage-dependent activation and divalent cation selectivity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ren, D -- Navarro, B -- Xu, H -- Yue, L -- Shi, Q -- Clapham, D E -- New York, N.Y. -- Science. 2001 Dec 14;294(5550):2372-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Children's Hospital, Harvard Medical School, Enders 1309, 320 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11743207" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Animals ; Bacillus/*chemistry/genetics/metabolism ; *Bacterial Proteins ; CHO Cells ; COS Cells ; Calcium/metabolism ; Calcium Channel Blockers/pharmacology ; Calcium Channels/chemistry/metabolism ; Cricetinae ; Dihydropyridines/pharmacology ; Genes, Bacterial ; Ion Channel Gating ; Membrane Potentials ; Molecular Sequence Data ; Molecular Weight ; Open Reading Frames ; Patch-Clamp Techniques ; Protein Structure, Tertiary ; Recombinant Proteins/metabolism ; Sodium/*metabolism ; Sodium Channels/chemistry/*genetics/*metabolism ; Tetrodotoxin/pharmacology ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Deletion of Trpm7 disrupts embryonic development and thymopoiesis without altering Mg2+ homeostasis (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-11-01
    Description: The gene transient receptor potential-melastatin-like 7 (Trpm7) encodes a protein that functions as an ion channel and a kinase. TRPM7 has been proposed to be required for cellular Mg2+ homeostasis in vertebrates. Deletion of mouse Trpm7 revealed that it is essential for embryonic development. Tissue-specific deletion of Trpm7 in the T cell lineage disrupted thymopoiesis, which led to a developmental block of thymocytes at the double-negative stage and a progressive depletion of thymic medullary cells. However, deletion of Trpm7 in T cells did not affect acute uptake of Mg2+ or the maintenance of total cellular Mg2+. Trpm7-deficient thymocytes exhibited dysregulated synthesis of many growth factors that are necessary for the differentiation and maintenance of thymic epithelial cells. The thymic medullary cells lost signal transducer and activator of transcription 3 activity, which accounts for their depletion when Trpm7 is disrupted in thymocytes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2605283/" 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/PMC2605283/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jin, Jie -- Desai, Bimal N -- Navarro, Betsy -- Donovan, Adriana -- Andrews, Nancy C -- Clapham, David E -- T32HL007572-20/HL/NHLBI NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2008 Oct 31;322(5902):756-60. doi: 10.1126/science.1163493.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cardiology, Howard Hughes Medical Institute, Children's Hospital Boston, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18974357" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD44/metabolism ; *Embryonic Development ; Gene Deletion ; Homeostasis ; Intercellular Signaling Peptides and Proteins/genetics/metabolism ; Interleukin-2 Receptor alpha Subunit/metabolism ; *Lymphopoiesis ; Magnesium/*metabolism ; Mice ; Mice, Knockout ; Patch-Clamp Techniques ; STAT3 Transcription Factor/metabolism ; T-Lymphocytes/*cytology/immunology/*metabolism ; TRPM Cation Channels/genetics/*physiology ; Thymus Gland/*cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Nonselective and G betagamma-insensitive weaver K+ channels (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-06-28
    Description: Homozygous weaver mice are profoundly ataxic because of the loss of granule cell neurons during cerebellar development. This granule cell loss appears to be caused by a genetic defect in the pore region (Gly156--〉Ser) of the heterotrimeric guanine nucleotide-binding protein (G protein)-gated inwardly rectifying potassium (K+) channel subunit (GIRK2). A related subunit, GIRK1, associates with GIRK2 to constitute a neuronal G protein-gated inward rectifier K+ channel. The weaver allele of the GIRK2 subunit (wvGIRK2) caused loss of K+ selectivity when expressed either as wvGIRK2 homomultimers or as GIRK1-wvGIRK2 heteromultimers. The mutation also let to loss of sensitivity to G protein betagamma dimers. Expression of wvGIRK2 subunits let to increased cell death, presumably as a result of basal nonselective channel opening.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Navarro, B -- Kennedy, M E -- Velimirovic, B -- Bhat, D -- Peterson, A S -- Clapham, D E -- New York, N.Y. -- Science. 1996 Jun 28;272(5270):1950-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, Mayo Foundation, Rochester, Minnesota 55905, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8658170" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antisense Elements (Genetics) ; CHO Cells ; Cell Death ; Cell Line ; Cerebellum/cytology/*metabolism ; Cricetinae ; G Protein-Coupled Inwardly-Rectifying Potassium Channels ; GTP-Binding Proteins/*physiology ; Membrane Potentials ; Mice ; Mice, Neurologic Mutants ; Molecular Sequence Data ; Neurons/cytology/metabolism ; Oocytes/cytology ; Patch-Clamp Techniques ; Point Mutation ; Potassium Channels/genetics/*metabolism ; *Potassium Channels, Inwardly Rectifying ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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