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  • Mice  (19)
  • Surface physics, nanoscale physics, low-dimensional systems  (5)
  • Nature Publishing Group (NPG)  (19)
  • American Physical Society (APS)  (5)
  • 1
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    Half-metallic Dirac cone in zigzag graphene nanoribbons on graphene (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-07-22
    Description: Author(s): M. X. Chen and M. Weinert The Dirac electrons of graphene, an intrinsic zero gap semiconductor, uniquely carry spin and pseudospin that give rise to many fascinating electronic and transport properties. While isolated zigzag graphene nanoribbons are antiferromagnetic semiconductors, we show by means of first-principles and t… [Phys. Rev. B 94, 035433] Published Thu Jul 21, 2016
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 2
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    Designing substrates for silicene and germanene: First-principles calculations (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-08-09
    Description: Author(s): M. X. Chen, Z. Zhong, and M. Weinert We propose a guideline for exploring substrates that stabilize the monolayer honeycomb structure of silicene and germanene while simultaneously preserving the Dirac states: in addition to having a strong binding energy to the monolayer, a suitable substrate should be a large-gap semiconductor with a… [Phys. Rev. B 94, 075409] Published Mon Aug 08, 2016
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
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    First-principles study of high-conductance DNA sequencing with carbon nanotube electrodes (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-03-27
    Description: Author(s): X. Chen, I. Rungger, C. D. Pemmaraju, U. Schwingenschlögl, and S. Sanvito Rapid and cost-effective DNA sequencing at the single nucleotide level might be achieved by measuring a transverse electronic current as single-stranded DNA is pulled through a nanometer-sized pore. In order to enhance the electronic coupling between the nucleotides and the electrodes and hence the ... [Phys. Rev. B 85, 115436] Published Mon Mar 26, 2012
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 4
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    Dendritic organization of sensory input to cortical neurons in vivo (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-04-30
    Description: In sensory cortex regions, neurons are tuned to specific stimulus features. For example, in the visual cortex, many neurons fire predominantly in response to moving objects of a preferred orientation. However, the characteristics of the synaptic input that cortical neurons receive to generate their output firing pattern remain unclear. Here we report a novel approach for the visualization and functional mapping of sensory inputs to the dendrites of cortical neurons in vivo. By combining high-speed two-photon imaging with electrophysiological recordings, we identify local subthreshold calcium signals that correspond to orientation-specific synaptic inputs. We find that even inputs that share the same orientation preference are widely distributed throughout the dendritic tree. At the same time, inputs of different orientation preference are interspersed, so that adjacent dendritic segments are tuned to distinct orientations. Thus, orientation-tuned neurons can compute their characteristic firing pattern by integrating spatially distributed synaptic inputs coding for multiple stimulus orientations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jia, Hongbo -- Rochefort, Nathalie L -- Chen, Xiaowei -- Konnerth, Arthur -- England -- Nature. 2010 Apr 29;464(7293):1307-12. doi: 10.1038/nature08947.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Neuroscience and Center for Integrated Protein Science, Technical University Munich, Biedersteinerstrasse 29, 80802 Munich, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20428163" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Calcium Signaling ; Dendrites/*physiology ; Mice ; Mice, Inbred C57BL ; Models, Neurological ; Sensory Receptor Cells/cytology/*physiology ; Synapses/metabolism ; Visual Cortex/*cytology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
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    Proteasome subunit Rpn13 is a novel ubiquitin receptor (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-05-24
    Description: Proteasomal receptors that recognize ubiquitin chains attached to substrates are key mediators of selective protein degradation in eukaryotes. Here we report the identification of a new ubiquitin receptor, Rpn13/ARM1, a known component of the proteasome. Rpn13 binds ubiquitin through a conserved amino-terminal region termed the pleckstrin-like receptor for ubiquitin (Pru) domain, which binds K48-linked diubiquitin with an affinity of approximately 90 nM. Like proteasomal ubiquitin receptor Rpn10/S5a, Rpn13 also binds ubiquitin-like (UBL) domains of UBL-ubiquitin-associated (UBA) proteins. In yeast, a synthetic phenotype results when specific mutations of the ubiquitin binding sites of Rpn10 and Rpn13 are combined, indicating functional linkage between these ubiquitin receptors. Because Rpn13 is also the proteasomal receptor for Uch37, a deubiquitinating enzyme, our findings suggest a coupling of chain recognition and disassembly at the proteasome.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2839886/" 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/PMC2839886/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Husnjak, Koraljka -- Elsasser, Suzanne -- Zhang, Naixia -- Chen, Xiang -- Randles, Leah -- Shi, Yuan -- Hofmann, Kay -- Walters, Kylie J -- Finley, Daniel -- Dikic, Ivan -- CA097004/CA/NCI NIH HHS/ -- GM008700/GM/NIGMS NIH HHS/ -- GM043601/GM/NIGMS NIH HHS/ -- R01 CA097004/CA/NCI NIH HHS/ -- R01 CA097004-05/CA/NCI NIH HHS/ -- R01 CA097004-06A1/CA/NCI NIH HHS/ -- R37 GM043601/GM/NIGMS NIH HHS/ -- R37 GM043601-17/GM/NIGMS NIH HHS/ -- T32 GM008700/GM/NIGMS NIH HHS/ -- T32 GM008700-09/GM/NIGMS NIH HHS/ -- England -- Nature. 2008 May 22;453(7194):481-8. doi: 10.1038/nature06926.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biochemistry II and Cluster of Excellence Macromolecular Complexes, Goethe University, Theodor-Stern-Kai 7, D-60590 Frankfurt (Main), Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497817" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites/genetics ; Cell Adhesion Molecules/chemistry/genetics/metabolism ; Humans ; Membrane Glycoproteins/chemistry/genetics/metabolism ; Mice ; Molecular Sequence Data ; Mutation/genetics ; Phenotype ; Proteasome Endopeptidase Complex/*chemistry/genetics/*metabolism ; Protein Subunits/chemistry/genetics/metabolism ; Saccharomyces cerevisiae Proteins/chemistry/genetics/metabolism ; Ubiquitin/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    Incorporation of a non-human glycan mediates human susceptibility to a bacterial toxin (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-10-31
    Description: AB(5) toxins comprise an A subunit that corrupts essential eukaryotic cell functions, and pentameric B subunits that direct target-cell uptake after binding surface glycans. Subtilase cytotoxin (SubAB) is an AB(5) toxin secreted by Shiga toxigenic Escherichia coli (STEC), which causes serious gastrointestinal disease in humans. SubAB causes haemolytic uraemic syndrome-like pathology in mice through SubA-mediated cleavage of BiP/GRP78, an essential endoplasmic reticulum chaperone. Here we show that SubB has a strong preference for glycans terminating in the sialic acid N-glycolylneuraminic acid (Neu5Gc), a monosaccharide not synthesized in humans. Structures of SubB-Neu5Gc complexes revealed the basis for this specificity, and mutagenesis of key SubB residues abrogated in vitro glycan recognition, cell binding and cytotoxicity. SubAB specificity for Neu5Gc was confirmed using mouse tissues with a human-like deficiency of Neu5Gc and human cell lines fed with Neu5Gc. Despite lack of Neu5Gc biosynthesis in humans, assimilation of dietary Neu5Gc creates high-affinity receptors on human gut epithelia and kidney vasculature. This, and the lack of Neu5Gc-containing body fluid competitors in humans, confers susceptibility to the gastrointestinal and systemic toxicities of SubAB. Ironically, foods rich in Neu5Gc are the most common source of STEC contamination. Thus a bacterial toxin's receptor is generated by metabolic incorporation of an exogenous factor derived from food.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2723748/" 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/PMC2723748/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Byres, Emma -- Paton, Adrienne W -- Paton, James C -- Lofling, Jonas C -- Smith, David F -- Wilce, Matthew C J -- Talbot, Ursula M -- Chong, Damien C -- Yu, Hai -- Huang, Shengshu -- Chen, Xi -- Varki, Nissi M -- Varki, Ajit -- Rossjohn, Jamie -- Beddoe, Travis -- R01 AI068715-01A1/AI/NIAID NIH HHS/ -- R01 AI068715-02/AI/NIAID NIH HHS/ -- England -- Nature. 2008 Dec 4;456(7222):648-52. doi: 10.1038/nature07428. Epub 2008 Oct 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Protein Crystallography Unit and ARC Centre of Excellence for Structural and Functional Microbial Genomics, Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18971931" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Toxins/chemistry/genetics/*metabolism/*toxicity ; Cell Death/drug effects ; Cell Line ; Crystallography, X-Ray ; Escherichia coli Proteins/*chemistry/genetics/metabolism/*toxicity ; Humans ; Mice ; Microscopy, Fluorescence ; Models, Molecular ; Neuraminic Acids/administration & dosage/*metabolism/pharmacology ; Polysaccharides/*chemistry/*metabolism ; Protein Binding ; Protein Subunits ; Shiga-Toxigenic Escherichia coli/chemistry/pathogenicity ; Sialic Acids/chemistry/metabolism ; Species Specificity ; Substrate Specificity ; Subtilisins/*chemistry/genetics/metabolism/*toxicity ; Survival Analysis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Ubiquitin docking at the proteasome through a novel pleckstrin-homology domain interaction (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-05-24
    Description: Targeted protein degradation is largely performed by the ubiquitin-proteasome pathway, in which substrate proteins are marked by covalently attached ubiquitin chains that mediate recognition by the proteasome. It is currently unclear how the proteasome recognizes its substrates, as the only established ubiquitin receptor intrinsic to the proteasome is Rpn10/S5a (ref. 1), which is not essential for ubiquitin-mediated protein degradation in budding yeast. In the accompanying manuscript we report that Rpn13 (refs 3-7), a component of the nine-subunit proteasome base, functions as a ubiquitin receptor, complementing its known role in docking de-ubiquitinating enzyme Uch37/UCHL5 (refs 4-6) to the proteasome. Here we merge crystallography and NMR data to describe the ubiquitin-binding mechanism of Rpn13. We determine the structure of Rpn13 alone and complexed with ubiquitin. The co-complex reveals a novel ubiquitin-binding mode in which loops rather than secondary structural elements are used to capture ubiquitin. Further support for the role of Rpn13 as a proteasomal ubiquitin receptor is demonstrated by its ability to bind ubiquitin and proteasome subunit Rpn2/S1 simultaneously. Finally, we provide a model structure of Rpn13 complexed to diubiquitin, which provides insights into how Rpn13 as a ubiquitin receptor is coupled to substrate deubiquitination by Uch37.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2825158/" 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/PMC2825158/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schreiner, Patrick -- Chen, Xiang -- Husnjak, Koraljka -- Randles, Leah -- Zhang, Naixia -- Elsasser, Suzanne -- Finley, Daniel -- Dikic, Ivan -- Walters, Kylie J -- Groll, Michael -- CA097004/CA/NCI NIH HHS/ -- GM008700/GM/NIGMS NIH HHS/ -- GM43601/GM/NIGMS NIH HHS/ -- R01 CA097004/CA/NCI NIH HHS/ -- R01 CA097004-05/CA/NCI NIH HHS/ -- R01 CA097004-06A1/CA/NCI NIH HHS/ -- R37 GM043601/GM/NIGMS NIH HHS/ -- R37 GM043601-17/GM/NIGMS NIH HHS/ -- T32 GM008700/GM/NIGMS NIH HHS/ -- T32 GM008700-09/GM/NIGMS NIH HHS/ -- England -- Nature. 2008 May 22;453(7194):548-52. doi: 10.1038/nature06924.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Integrated Protein Science at the Department Chemie, Lehrstuhl fur Biochemie, Technische Universitat Munchen, Lichtenbergstrasse 4, D-85747 Garching, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497827" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Animals ; Cell Adhesion Molecules/*chemistry/genetics/*metabolism ; Crystallography, X-Ray ; Humans ; Membrane Glycoproteins/chemistry/genetics/metabolism ; Mice ; Models, Molecular ; Nuclear Magnetic Resonance, Biomolecular ; Proteasome Endopeptidase Complex/*chemistry/*metabolism ; Protein Binding ; Protein Structure, Tertiary ; Protein Subunits/chemistry/genetics/metabolism ; Ubiquitin/chemistry/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
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    Inhibitory receptors bind ANGPTLs and support blood stem cells and leukaemia development (2012)
    Nature Publishing Group (NPG)
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    Publication Date: 2012-06-05
    Description: How environmental cues regulate adult stem cell and cancer cell activity through surface receptors is poorly understood. Angiopoietin-like proteins (ANGPTLs), a family of seven secreted glycoproteins, are known to support the activity of haematopoietic stem cells (HSCs) in vitro and in vivo. ANGPTLs also have important roles in lipid metabolism, angiogenesis and inflammation, but were considered 'orphan ligands' because no receptors were identified. Here we show that the immune-inhibitory receptor human leukocyte immunoglobulin-like receptor B2 (LILRB2) and its mouse orthologue paired immunoglobulin-like receptor (PIRB) are receptors for several ANGPTLs. LILRB2 and PIRB are expressed on human and mouse HSCs, respectively, and the binding of ANGPTLs to these receptors supported ex vivo expansion of HSCs. In mouse transplantation acute myeloid leukaemia models, a deficiency in intracellular signalling of PIRB resulted in increased differentiation of leukaemia cells, revealing that PIRB supports leukaemia development. Our study indicates an unexpected functional significance of classical immune-inhibitory receptors in maintenance of stemness of normal adult stem cells and in support of cancer development.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3367397/" 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/PMC3367397/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zheng, Junke -- Umikawa, Masato -- Cui, Changhao -- Li, Jiyuan -- Chen, Xiaoli -- Zhang, Chaozheng -- Huynh, HoangDinh -- Kang, Xunlei -- Silvany, Robert -- Wan, Xuan -- Ye, Jingxiao -- Canto, Alberto Puig -- Chen, Shu-Hsia -- Wang, Huan-You -- Ward, E Sally -- Zhang, Cheng Cheng -- K01 CA 120099/CA/NCI NIH HHS/ -- K01 CA120099/CA/NCI NIH HHS/ -- K01 CA120099-03/CA/NCI NIH HHS/ -- K01 CA120099-04/CA/NCI NIH HHS/ -- K01 CA120099-05/CA/NCI NIH HHS/ -- K01 CA120099-06/CA/NCI NIH HHS/ -- R01 CA109322/CA/NCI NIH HHS/ -- R01 CA172268/CA/NCI NIH HHS/ -- England -- Nature. 2012 May 30;485(7400):656-60. doi: 10.1038/nature11095.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Physiology and Developmental Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22660330" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Division ; Cells, Cultured ; Disease Models, Animal ; Fetal Blood/cytology/metabolism ; HEK293 Cells ; Hematopoietic Stem Cells/*cytology/*metabolism ; Humans ; Leukemia/*metabolism/*pathology ; Membrane Glycoproteins/genetics/*metabolism ; Mice ; Myeloid-Lymphoid Leukemia Protein ; Receptors, Immunologic/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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  • 9
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    Pathogen blocks host death receptor signalling by arginine GlcNAcylation of death domains (2013)
    Nature Publishing Group (NPG)
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    Publication Date: 2013-08-21
    Description: The tumour necrosis factor (TNF) family is crucial for immune homeostasis, cell death and inflammation. These cytokines are recognized by members of the TNF receptor (TNFR) family of death receptors, including TNFR1 and TNFR2, and FAS and TNF-related apoptosis-inducing ligand (TRAIL) receptors. Death receptor signalling requires death-domain-mediated homotypic/heterotypic interactions between the receptor and its downstream adaptors, including TNFR1-associated death domain protein (TRADD) and FAS-associated death domain protein (FADD). Here we discover that death domains in several proteins, including TRADD, FADD, RIPK1 and TNFR1, were directly inactivated by NleB, an enteropathogenic Escherichia coli (EPEC) type III secretion system effector known to inhibit host nuclear factor-kappaB (NF-kappaB) signalling. NleB contained an unprecedented N-acetylglucosamine (GlcNAc) transferase activity that specifically modified a conserved arginine in these death domains (Arg 235 in the TRADD death domain). NleB GlcNAcylation (the addition of GlcNAc onto a protein side chain) of death domains blocked homotypic/heterotypic death domain interactions and assembly of the oligomeric TNFR1 complex, thereby disrupting TNF signalling in EPEC-infected cells, including NF-kappaB signalling, apoptosis and necroptosis. Type-III-delivered NleB also blocked FAS ligand and TRAIL-induced cell death by preventing formation of a FADD-mediated death-inducing signalling complex (DISC). The arginine GlcNAc transferase activity of NleB was required for bacterial colonization in the mouse model of EPEC infection. The mechanism of action of NleB represents a new model by which bacteria counteract host defences, and also a previously unappreciated post-translational modification.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Shan -- Zhang, Li -- Yao, Qing -- Li, Lin -- Dong, Na -- Rong, Jie -- Gao, Wenqing -- Ding, Xiaojun -- Sun, Liming -- Chen, Xing -- Chen, She -- Shao, Feng -- Howard Hughes Medical Institute/ -- England -- Nature. 2013 Sep 12;501(7466):242-6. doi: 10.1038/nature12436. Epub 2013 Aug 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉College of Biological Sciences, China Agricultural University, Beijing 100094, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23955153" target="_blank"〉PubMed〈/a〉
    Keywords: Acylation ; Animals ; Antigens, CD95/metabolism ; Apoptosis ; Arginine/*metabolism ; Death Domain Receptor Signaling Adaptor Proteins/metabolism ; Disease Models, Animal ; Enteropathogenic Escherichia coli/*metabolism/pathogenicity ; Escherichia coli Infections/metabolism/microbiology/pathology ; Escherichia coli Proteins/*metabolism ; Fas-Associated Death Domain Protein/chemistry/metabolism ; HeLa Cells ; Humans ; Male ; Mice ; Mice, Inbred C57BL ; Multiprotein Complexes/chemistry/metabolism ; N-Acetylglucosaminyltransferases/*metabolism ; NF-kappa B/metabolism ; Protein Biosynthesis ; Protein Structure, Tertiary ; Receptor-Interacting Protein Serine-Threonine Kinases/chemistry/metabolism ; Receptors, Tumor Necrosis Factor, Type I/chemistry/metabolism ; *Signal Transduction ; TNF Receptor-Associated Death Domain Protein/*chemistry/*metabolism ; TNF-Related Apoptosis-Inducing Ligand/metabolism ; Tumor Necrosis Factor-alpha/metabolism ; Virulence ; Virulence Factors/*metabolism
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  • 10
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    Allosteric ligands for the pharmacologically dark receptors GPR68 and GPR65 (2015)
    Nature Publishing Group (NPG)
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    Publication Date: 2015-11-10
    Description: At least 120 non-olfactory G-protein-coupled receptors in the human genome are 'orphans' for which endogenous ligands are unknown, and many have no selective ligands, hindering the determination of their biological functions and clinical relevance. Among these is GPR68, a proton receptor that lacks small molecule modulators for probing its biology. Using yeast-based screens against GPR68, here we identify the benzodiazepine drug lorazepam as a non-selective GPR68 positive allosteric modulator. More than 3,000 GPR68 homology models were refined to recognize lorazepam in a putative allosteric site. Docking 3.1 million molecules predicted new GPR68 modulators, many of which were confirmed in functional assays. One potent GPR68 modulator, ogerin, suppressed recall in fear conditioning in wild-type but not in GPR68-knockout mice. The same approach led to the discovery of allosteric agonists and negative allosteric modulators for GPR65. Combining physical and structure-based screening may be broadly useful for ligand discovery for understudied and orphan GPCRs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huang, Xi-Ping -- Karpiak, Joel -- Kroeze, Wesley K -- Zhu, Hu -- Chen, Xin -- Moy, Sheryl S -- Saddoris, Kara A -- Nikolova, Viktoriya D -- Farrell, Martilias S -- Wang, Sheng -- Mangano, Thomas J -- Deshpande, Deepak A -- Jiang, Alice -- Penn, Raymond B -- Jin, Jian -- Koller, Beverly H -- Kenakin, Terry -- Shoichet, Brian K -- Roth, Bryan L -- GM59957/GM/NIGMS NIH HHS/ -- GM71896/GM/NIGMS NIH HHS/ -- P01 HL114471/HL/NHLBI NIH HHS/ -- R01 DA017204/DA/NIDA NIH HHS/ -- R01 DA027170/DA/NIDA NIH HHS/ -- U01 MH104974/MH/NIMH NIH HHS/ -- U19MH082441/MH/NIMH NIH HHS/ -- U54 HD079124/HD/NICHD NIH HHS/ -- England -- Nature. 2015 Nov 26;527(7579):477-83. doi: 10.1038/nature15699. Epub 2015 Nov 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599-7365, USA. ; National Institute of Mental Health Psychoactive Drug Screening Program (NIMH PDSP), School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7365, USA. ; Department of Pharmaceutical Chemistry, University of California at San Francisco, Byers Hall, 1700 4th Street, San Francisco, California 94158-2550, USA. ; Center for Integrative Chemical Biology and Drug Discovery (CICBDD), University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7363, USA. ; Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7360, USA. ; Department of Psychiatry and Carolina Institute for Developmental Disabilities (CIDD), University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7146, USA. ; Center for Translational Medicine and Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA. ; Department of Genetics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7264, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26550826" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation/drug effects ; Allosteric Site ; Animals ; Anti-Anxiety Agents/analysis/chemistry/metabolism/pharmacology ; Benzyl Alcohols/analysis/*chemistry/metabolism/*pharmacology ; Conditioning, Classical ; *Drug Discovery ; Fear ; Female ; HEK293 Cells ; Humans ; Ligands ; Lorazepam/analysis/*chemistry/metabolism/*pharmacology ; Male ; Memory/drug effects ; Mice ; Mice, Knockout ; Models, Molecular ; Receptors, G-Protein-Coupled/agonists/antagonists & ; inhibitors/chemistry/deficiency/*metabolism ; Signal Transduction/drug effects ; Triazines/analysis/*chemistry/metabolism/*pharmacology
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