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  • 1
    Publication Date: 2012-12-12
    Description: Touch sensation is essential for behaviours ranging from environmental exploration to social interaction; however, the underlying mechanisms are largely unknown. In Drosophila larvae, two types of sensory neurons, class III and class IV dendritic arborization neurons, tile the body wall. The mechanotransduction channel PIEZO in class IV neurons is essential for sensing noxious mechanical stimuli but is not involved in gentle touch. On the basis of electrophysiological-recording, calcium-imaging and behavioural studies, here we report that class III dendritic arborization neurons are touch sensitive and contribute to gentle-touch sensation. We further identify NOMPC (No mechanoreceptor potential C), a member of the transient receptor potential (TRP) family of ion channels, as a mechanotransduction channel for gentle touch. NOMPC is highly expressed in class III neurons and is required for their mechanotransduction. Moreover, ectopic NOMPC expression confers touch sensitivity to the normally touch-insensitive class IV neurons. In addition to the critical role of NOMPC in eliciting gentle-touch-mediated behavioural responses, expression of this protein in the Drosophila S2 cell line also gives rise to mechanosensitive channels in which ion selectivity can be altered by NOMPC mutation, indicating that NOMPC is a pore-forming subunit of a mechanotransduction channel. Our study establishes NOMPC as a bona fide mechanotransduction channel that satisfies all four criteria proposed for a channel to qualify as a transducer of mechanical stimuli and mediates gentle-touch sensation. Our study also suggests that different mechanosensitive channels may be used to sense gentle touch versus noxious mechanical stimuli.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3917554/" 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/PMC3917554/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yan, Zhiqiang -- Zhang, Wei -- He, Ye -- Gorczyca, David -- Xiang, Yang -- Cheng, Li E -- Meltzer, Shan -- Jan, Lily Yeh -- Jan, Yuh Nung -- 5R01MH084234/MH/NIMH NIH HHS/ -- P30 DK063720/DK/NIDDK NIH HHS/ -- R01 MH084234/MH/NIMH NIH HHS/ -- R37 NS040929/NS/NINDS NIH HHS/ -- R37NS040929/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2013 Jan 10;493(7431):221-5. doi: 10.1038/nature11685. Epub 2012 Dec 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Physiology, University of California, San Francisco, San Francisco, California 94158, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23222543" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Line ; Dendrites/physiology ; Drosophila Proteins/chemistry/genetics/*metabolism ; Drosophila melanogaster/cytology/growth & development/*physiology ; Larva/cytology/physiology ; Mechanotransduction, Cellular/*physiology ; Molecular Sequence Data ; Mutation ; Protein Subunits/chemistry/genetics/*metabolism ; Sequence Alignment ; Touch/*physiology ; Transient Receptor Potential Channels/chemistry/genetics/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2011-11-26
    Description: Abscisic acid (ABA) is an essential hormone for plants to survive environmental stresses. At the center of the ABA signaling network is a subfamily of type 2C protein phosphatases (PP2Cs), which form exclusive interactions with ABA receptors and subfamily 2 Snfl-related kinase (SnRK2s). Here, we report a SnRK2-PP2C complex structure, which reveals marked similarity in PP2C recognition by SnRK2 and ABA receptors. In the complex, the kinase activation loop docks into the active site of PP2C, while the conserved ABA-sensing tryptophan of PP2C inserts into the kinase catalytic cleft, thus mimicking receptor-PP2C interactions. These structural results provide a simple mechanism that directly couples ABA binding to SnRK2 kinase activation and highlight a new paradigm of kinase-phosphatase regulation through mutual packing of their catalytic sites.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3584687/" 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/PMC3584687/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soon, Fen-Fen -- Ng, Ley-Moy -- Zhou, X Edward -- West, Graham M -- Kovach, Amanda -- Tan, M H Eileen -- Suino-Powell, Kelly M -- He, Yuanzheng -- Xu, Yong -- Chalmers, Michael J -- Brunzelle, Joseph S -- Zhang, Huiming -- Yang, Huaiyu -- Jiang, Hualiang -- Li, Jun -- Yong, Eu-Leong -- Cutler, Sean -- Zhu, Jian-Kang -- Griffin, Patrick R -- Melcher, Karsten -- Xu, H Eric -- GM084041/GM/NIGMS NIH HHS/ -- R01 GM059138/GM/NIGMS NIH HHS/ -- S10 RR027270/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2012 Jan 6;335(6064):85-8. doi: 10.1126/science.1215106. Epub 2011 Nov 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Structural Sciences, Van Andel Research Institute, 333 Bostwick Avenue NE, Grand Rapids, MI 49503, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22116026" target="_blank"〉PubMed〈/a〉
    Keywords: Abscisic Acid/chemistry/*metabolism ; Amino Acid Sequence ; Arabidopsis/chemistry/*metabolism ; Arabidopsis Proteins/antagonists & inhibitors/*chemistry/*metabolism ; Catalytic Domain ; Crystallography, X-Ray ; Enzyme Activation ; Models, Molecular ; *Molecular Mimicry ; Molecular Sequence Data ; Phosphoprotein Phosphatases/*chemistry/*metabolism ; Phosphorylation ; Protein Binding ; Protein Structure, Tertiary ; Protein-Serine-Threonine Kinases/antagonists & inhibitors/*chemistry/*metabolism ; Recombinant Fusion Proteins/chemistry/metabolism ; Signal Transduction
    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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