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Kollewe A, Schwarz Y, Oleinikov K, Raza A, Haupt A, Wartenberg P, Wyatt A, Boehm U, Ectors F, Bildl W, Zolles G, Schulte U, Bruns D, Flockerzi V, Fakler B. Subunit composition, molecular environment, and activation of native TRPC channels encoded by their interactomes. Neuron 2022; 110:4162-4175.e7. [PMID: 36257322 DOI: 10.1016/j.neuron.2022.09.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 08/15/2022] [Accepted: 09/23/2022] [Indexed: 12/24/2022]
Abstract
In the mammalian brain TRPC channels, a family of Ca2+-permeable cation channels, are involved in a variety of processes from neuronal growth and synapse formation to transmitter release, synaptic transmission and plasticity. The molecular appearance and operation of native TRPC channels, however, remained poorly understood. Here, we used high-resolution proteomics to show that TRPC channels in the rodent brain are macro-molecular complexes of more than 1 MDa in size that result from the co-assembly of the tetrameric channel core with an ensemble of interacting proteins (interactome). The core(s) of TRPC1-, C4-, and C5-containing channels are mostly heteromers with defined stoichiometries for each subtype, whereas TRPC3, C6, and C7 preferentially form homomers. In addition, TRPC1/C4/C5 channels may co-assemble with the metabotropic glutamate receptor mGluR1, thus guaranteeing both specificity and reliability of channel activation via the phospholipase-Ca2+ pathway. Our results unveil the subunit composition of native TRPC channels and resolve the molecular details underlying their activation.
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Affiliation(s)
- Astrid Kollewe
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Hermann-Herder-Str. 7, 79104 Freiburg, Germany
| | - Yvonne Schwarz
- Institute of Physiology, Center for Integrative Physiology and Molecular Medicine, Saarland University, 66421 Homburg, Germany
| | - Katharina Oleinikov
- Institute of Physiology, Center for Integrative Physiology and Molecular Medicine, Saarland University, 66421 Homburg, Germany
| | - Ahsan Raza
- Experimental and Clinical Pharmacology and Toxicology, PZMS, Saarland University, 66421 Homburg, Germany
| | - Alexander Haupt
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Hermann-Herder-Str. 7, 79104 Freiburg, Germany
| | - Philipp Wartenberg
- Experimental and Clinical Pharmacology and Toxicology, PZMS, Saarland University, 66421 Homburg, Germany
| | - Amanda Wyatt
- Experimental and Clinical Pharmacology and Toxicology, PZMS, Saarland University, 66421 Homburg, Germany
| | - Ulrich Boehm
- Experimental and Clinical Pharmacology and Toxicology, PZMS, Saarland University, 66421 Homburg, Germany
| | - Fabien Ectors
- Transgenic facility, FARAH Research Center, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - Wolfgang Bildl
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Hermann-Herder-Str. 7, 79104 Freiburg, Germany
| | - Gerd Zolles
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Hermann-Herder-Str. 7, 79104 Freiburg, Germany
| | - Uwe Schulte
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Hermann-Herder-Str. 7, 79104 Freiburg, Germany; Signalling Research Centres BIOSS and CIBSS, Schänzlestr. 18, 79104 Freiburg, Germany
| | - Dieter Bruns
- Institute of Physiology, Center for Integrative Physiology and Molecular Medicine, Saarland University, 66421 Homburg, Germany
| | - Veit Flockerzi
- Experimental and Clinical Pharmacology and Toxicology, PZMS, Saarland University, 66421 Homburg, Germany.
| | - Bernd Fakler
- Institute of Physiology, Faculty of Medicine, University of Freiburg, Hermann-Herder-Str. 7, 79104 Freiburg, Germany; Signalling Research Centres BIOSS and CIBSS, Schänzlestr. 18, 79104 Freiburg, Germany; Center for Basics in NeuroModulation, Breisacherstr. 4, 79106 Freiburg, Germany.
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2
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Pérez-Gordones MC, Ramírez-Iglesias JR, Benaim G, Mendoza M. A store-operated Ca 2+-entry in Trypanosoma equiperdum: Physiological evidences of its presence. Mol Biochem Parasitol 2021; 244:111394. [PMID: 34216677 DOI: 10.1016/j.molbiopara.2021.111394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 06/26/2021] [Accepted: 06/28/2021] [Indexed: 02/06/2023]
Abstract
The Trypanosomatidae family encompasses many unicellular organisms responsible of several tropical diseases that affect humans and animals. Livestock tripanosomosis caused by Trypanosoma brucei brucei (T. brucei), Trypanosoma equiperdum (T. equiperdum) and Trypanosoma evansi (T. evansi), have a significant socio-economic impact and limit animal protein productivity throughout the intertropical zones of the world. Similarly, to all organisms, the maintenance of Ca2+ homeostasis is vital for these parasites, and the mechanism involved in the intracellular Ca2+ regulation have been widely described. However, the evidences related to the mechanisms responsible for the Ca2+ entry are scarce. Even more, to date the presence of a store-operated Ca2+ channel (SOC) has not been reported. Despite the apparent absence of Orai and STIM-like proteins in these parasites, in the present work we demonstrate the presence of a store-operated Ca2+-entry (SOCE) in T. equiperdum, using physiological techniques. This Ca2+-entry is induced by thapsigargin (TG) and 2,5-di-t-butyl-1,4-benzohydroquinone (BHQ), and inhibited by 2-aminoethoxydiphenyl borate (2APB). Additionally, the use of bioinformatics techniques allowed us to identify putative transient receptor potential (TRP) channels, present in members of the Trypanozoon family, which would be possible candidates responsible for the SOCE described in the present work in T. equiperdum.
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Affiliation(s)
- María C Pérez-Gordones
- Instituto de Biología Experimental (IBE), Universidad Central de Venezuela (UCV), Caracas, Venezuela
| | - José R Ramírez-Iglesias
- Group of Neglected and Emerging Diseases, Epidemiology and Biodiversity, Health Sciences Faculty, Universidad Internacional SEK (UISEK), Quito, Ecuador
| | - Gustavo Benaim
- Instituto de Biología Experimental (IBE), Universidad Central de Venezuela (UCV), Caracas, Venezuela; Instituto de Estudios Avanzados (IDEA), Caracas, Venezuela
| | - Marta Mendoza
- Centro de Estudios Biomédicos y Veterinarios, Instituto de Estudios Científicos y Tecnológicos (IDECYT), Universidad Nacional Experimental Simón Rodríguez, Caracas, Venezuela.
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3
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Li C, Ma W, Yin S, Liang X, Shu X, Pei D, Egan TM, Huang J, Pan A, Li Z. Sorting Nexin 11 Regulates Lysosomal Degradation of Plasma Membrane TRPV3. Traffic 2016; 17:500-14. [DOI: 10.1111/tra.12379] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Revised: 01/21/2016] [Accepted: 01/21/2016] [Indexed: 12/15/2022]
Affiliation(s)
- Caiyue Li
- Key Laboratory of Regenerative Biology, Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Guangzhou China
| | - Wenbo Ma
- Key Laboratory of Regenerative Biology, Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Guangzhou China
| | - Shikui Yin
- Key Laboratory of Regenerative Biology, Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Guangzhou China
| | - Xin Liang
- Key Laboratory of Regenerative Biology, Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Guangzhou China
| | - Xiaodong Shu
- Key Laboratory of Regenerative Biology, Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Guangzhou China
| | - Duanqing Pei
- Key Laboratory of Regenerative Biology, Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Guangzhou China
| | - Terrance M. Egan
- Pharmacological and Physiological Science, School of Medicine; Saint Louis University; St. Louis MO USA
| | - Jufang Huang
- Department of Anatomy and Neurobiology, Xiangya School of Medicine; Central South University; Changsha China
| | - Aihua Pan
- Department of Anatomy and Neurobiology, Xiangya School of Medicine; Central South University; Changsha China
| | - Zhiyuan Li
- Key Laboratory of Regenerative Biology, Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Guangzhou China
- Department of Anatomy and Neurobiology, Xiangya School of Medicine; Central South University; Changsha China
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Ohya S, Kito H, Hatano N, Muraki K. Recent advances in therapeutic strategies that focus on the regulation of ion channel expression. Pharmacol Ther 2016; 160:11-43. [PMID: 26896566 DOI: 10.1016/j.pharmthera.2016.02.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A number of different ion channel types are involved in cell signaling networks, and homeostatic regulatory mechanisms contribute to the control of ion channel expression. Profiling of global gene expression using microarray technology has recently provided novel insights into the molecular mechanisms underlying the homeostatic and pathological control of ion channel expression. It has demonstrated that the dysregulation of ion channel expression is associated with the pathogenesis of neural, cardiovascular, and immune diseases as well as cancers. In addition to the transcriptional, translational, and post-translational regulation of ion channels, potentially important evidence on the mechanisms controlling ion channel expression has recently been accumulated. The regulation of alternative pre-mRNA splicing is therefore a novel therapeutic strategy for the treatment of dominant-negative splicing disorders. Epigenetic modification plays a key role in various pathological conditions through the regulation of pluripotency genes. Inhibitors of pre-mRNA splicing and histone deacetyalase/methyltransferase have potential as potent therapeutic drugs for cancers and autoimmune and inflammatory diseases. Moreover, membrane-anchoring proteins, lysosomal and proteasomal degradation-related molecules, auxiliary subunits, and pharmacological agents alter the protein folding, membrane trafficking, and post-translational modifications of ion channels, and are linked to expression-defect channelopathies. In this review, we focused on recent insights into the transcriptional, spliceosomal, epigenetic, and proteasomal regulation of ion channel expression: Ca(2+) channels (TRPC/TRPV/TRPM/TRPA/Orai), K(+) channels (voltage-gated, KV/Ca(2+)-activated, KCa/two-pore domain, K2P/inward-rectifier, Kir), and Ca(2+)-activated Cl(-) channels (TMEM16A/TMEM16B). Furthermore, this review highlights expression of these ion channels in expression-defect channelopathies.
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Affiliation(s)
- Susumu Ohya
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
| | - Hiroaki Kito
- Department of Pharmacology, Division of Pathological Sciences, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan
| | - Noriyuki Hatano
- Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya 464-8650, Japan
| | - Katsuhiko Muraki
- Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Nagoya 464-8650, Japan.
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Wu QY, Sun MR, Wu CL, Li Y, Du JJ, Zeng JY, Bi HL, Sun YH. Activation of calcium-sensing receptor increases TRPC3/6 expression in T lymphocyte in sepsis. Mol Immunol 2014; 64:18-25. [PMID: 25467798 DOI: 10.1016/j.molimm.2014.10.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 10/23/2014] [Indexed: 01/17/2023]
Abstract
Sepsis is a systemic inflammatory response syndrome induced by infection. T Lymphocytes play an important role in this disease. Transient receptor potential (TRP) channels and calcium-sensing receptors (CaSR) are expressed in lymphocytes to promote intracellular Ca(2+) release. However, data about the link between CaSR and TRP channels in septic T lymphocytes are few. In this study, by Ca(2+) imaging and Western blotting, we found that in septic rat peripheral blood T lymphocytes expressions of TRPC3 and TRPC6 proteins are higher. The SR/ER Ca(2+) ATPase inhibitor thapsigargin (TG) and CaSR agonist NPS R-568 also increased expressions of TRPC3 and TRPC6 proteins, which were reversed by PLC-IP3 channel blocker U73122 and TRPC channels inhibitor SKF96365. By Ca(2+) imaging, we found that the depletion of ER Ca(2+) stores by TG elicited a transient rise in cytoplasmic Ca(2+), followed by sustained increase depending on extracellular Ca(2+). But, SKF96365, not Verapamil (L-type channels inhibitor) and NiCl2 (Na(+)/Ca(2+) exchanger inhibitor), inhibited the relatively high [Ca(2+)]i. NPS R-568 also resulted in the same effect, and the duration of [Ca(2+)]i increase was eliminated completely by U73122 and was reduced in the absence of [Ca(2+)]o. NPS R-568 and TG increased the apoptotic ratio of septic T lymphocytes, which can be suppressed by SKF96365 and U73122. These results suggested that CaSR activation promoted the expression of TRPC3 and TRPC6 and enhanced T lymphocytes apoptosis through PLC-IP3 signaling pathway in sepsis.
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Affiliation(s)
- Qiu-yue Wu
- Department of Clinical Laboratory, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Ming-rui Sun
- Department of Pharmacology, Qiqihaer Medical College, Qiqihaer 160001, China
| | - Chun-li Wu
- Department of Clinical Laboratory, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Yang Li
- Department of Rheumatology, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Jing-jing Du
- Department of Clinical Laboratory, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Jing-ya Zeng
- Department of Clinical Laboratory, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Hai-liang Bi
- Department of Clinical Laboratory, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China
| | - Yi-hua Sun
- Department of Clinical Laboratory, the Second Affiliated Hospital of Harbin Medical University, Harbin 150086, China.
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Lockwood TD. Lysosomal metal, redox and proton cycles influencing the CysHis cathepsin reaction. Metallomics 2013; 5:110-24. [PMID: 23302864 DOI: 10.1039/c2mt20156a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In the 1930's pioneers discovered that maximal autolysis in tissue homogenates requires metal chelator, sulfhydryl reducing agent and acid pH. However, metals, reducing equivalents and protons (MR&P) have been overlooked as combined catalytic controls. Three categories of lysosomal machinery drive three distinguishable cycles importing and exporting MR&P. Zn(2+) preemptively inhibits CysHis catalysis under otherwise optimal protonation and reduction. Protein-bound cell Zn(2+) concentration is 200-2000 times the non-sequestered inhibitory concentration. Following autophagy, lysosomal proteolysis liberates much inhibitory Zn(2+). The vacuolar proton pump is the driving force for Zn(2+) export, as well as protonation of the peptidolytic mechanism. Other machinery of lysosomal cycles includes proton-driven Zn(2+) exporters (e.g. SLC11A1), Zn(2+) channels (e.g. TRPML-1), lysosomal thiol reductase, etc. The CysHis dyad is a sensor of the vacuolar environment of MR&P, an integrator of these simultaneous variables, and a catalytic responder. Rate-determination can shift between autophagic substrate acquisition (swallowing) and substrate degradation (digesting). Zn(2+) recycling from degraded proteins to new proteins is a fourth cycle that might pace lysosomal function under some conditions. Heritable insufficient or excess functions of CysHis cathepsins are associated with dysfunctional inflammation and immunity/auto-immunity, including diabetic pathogenesis.
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Affiliation(s)
- Thomas D Lockwood
- Dept. of Pharmacology, School of Medicine, Wright State University, Dayton, Ohio 45435, USA.
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Sun XD, You Y, Zhang L, Zheng S, Hong Y, Li J, Gao XH. The possible role of TRPC6 in atopic dermatitis. Med Hypotheses 2012; 78:42-4. [DOI: 10.1016/j.mehy.2011.09.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 09/13/2011] [Accepted: 09/19/2011] [Indexed: 11/17/2022]
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Bläsche R, Ebeling G, Perike S, Weinhold K, Kasper M, Barth K. Activation of P2X7R and downstream effects in bleomycin treated lung epithelial cells. Int J Biochem Cell Biol 2011; 44:514-24. [PMID: 22192844 DOI: 10.1016/j.biocel.2011.12.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 12/05/2011] [Accepted: 12/06/2011] [Indexed: 10/14/2022]
Abstract
Changes in intracellular calcium concentration [Ca(2+)](i) are believed to influence the proliferation and differentiation of airway epithelial cells both in vivo and in vitro. In the present study, using mouse alveolar epithelial E10 cells, we demonstrated that the treatment of lung epithelial cells with BLM resulted in elevated intracellular Ca(2+) levels. BLM further increased P2rx7 mRNA expression and P2X7R protein levels, paralleled by increased PKC-β1 levels. BLM treatment or stimulation of the P2X7R with the P2X7R agonist BzATP induced translocation of PKC-β1 from the cytoplasm to the membrane. The expression of PKC-β1 was repressed by the P2X7R inhibitor oxATP, suggesting that PKC-β1 is downstream of P2X7R activation. Furthermore, cells exposed to BLM contained increased amounts of P2X7R and PKC-β1 in Cav-1 containing lipid raft fractions. The comparison of lung tissues from wild-type and P2rx7(-/-) mice revealed decreased protein and mRNA levels of PKC-β1 and CaM as well as decreased immunoreactivity for PKC-β1. The knockdown of P2X7R in alveolar epithelial cells resulted also in a loss of PKC-β1. These data suggest that the effect of P2X7R on expression of PKC-β1 detected in alveolar epithelial cells is also functioning in the animal model. Immunohistochemical evaluation of fibrotic lungs derived from a BLM-induced mouse model revealed a strong increase in PKC-β1 immunoreactivity. The present experiments demonstrated that the increased expression of P2X7R influences PKC-β1. We predict that increased Ca(2+) concentration stimulates PKC-β1, whereas the prerequisite for activating PKC-β1 after P2X7R increase remained to be determined. Our findings suggest that PKC-β1 is important in the pathogenesis of pulmonary fibrosis.
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Affiliation(s)
- Robert Bläsche
- University of Technology Dresden, Department of Anatomy, Medical Clinic, Fetscherstr. 76, 01307 Dresden, Germany
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Richter D, Katz B, Oberacker T, Tzarfaty V, Belusic G, Minke B, Huber A. Translocation of the Drosophila transient receptor potential-like (TRPL) channel requires both the N- and C-terminal regions together with sustained Ca2+ entry. J Biol Chem 2011; 286:34234-43. [PMID: 21816824 PMCID: PMC3190804 DOI: 10.1074/jbc.m111.278564] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 07/29/2011] [Indexed: 11/06/2022] Open
Abstract
In Drosophila photoreceptors the transient receptor potential-like (TRPL), but not the TRP channels undergo light-dependent translocation between the rhabdomere and cell body. Here we studied which of the TRPL channel segments are essential for translocation and why the TRP channels are required for inducing TRPL translocation. We generated transgenic flies expressing chimeric TRP and TRPL proteins that formed functional light-activated channels. Translocation was induced only in chimera containing both the N- and C-terminal segments of TRPL. Using an inactive trp mutation and overexpressing the Na(+)/Ca(2+) exchanger revealed that the essential function of the TRP channels in TRPL translocation is to enhance Ca(2+)-influx. These results indicate that motifs present at both the N and C termini as well as sustained Ca(2+) entry are required for proper channel translocation.
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Affiliation(s)
- David Richter
- From the Department of Biosensorics, Institute of Physiology, University of Hohenheim, 70599 Stuttgart, Germany
| | - Ben Katz
- the Department of Medical Neurobiology and The Kühne Minerva Center for Studies of Visual Transduction, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel, and
| | - Tina Oberacker
- From the Department of Biosensorics, Institute of Physiology, University of Hohenheim, 70599 Stuttgart, Germany
| | - Vered Tzarfaty
- the Department of Medical Neurobiology and The Kühne Minerva Center for Studies of Visual Transduction, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel, and
| | - Gregor Belusic
- the Department of Biology, Biotechnical Faculty, University of Ljubljana 1000, Slovenia
| | - Baruch Minke
- the Department of Medical Neurobiology and The Kühne Minerva Center for Studies of Visual Transduction, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel, and
| | - Armin Huber
- From the Department of Biosensorics, Institute of Physiology, University of Hohenheim, 70599 Stuttgart, Germany
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Interactions among the SNARE proteins and complexin analyzed by a yeast four-hybrid assay. Anal Biochem 2011; 416:107-11. [DOI: 10.1016/j.ab.2011.05.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Accepted: 05/06/2011] [Indexed: 11/23/2022]
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