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  • 1
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    Interaction of UVR8 with COP1 [Plant Biology] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-10-03
    Description: UV-B light initiates photomorphogenic responses in plants. Arabidopsis UV RESISTANCE LOCUS8 (UVR8) specifically mediates these responses by functioning as a UV-B photoreceptor. UV-B exposure converts UVR8 from a dimer to a monomer, stimulates the rapid accumulation of UVR8 in the nucleus, where it binds to chromatin, and induces interaction of...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 2
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    Carbon density in managed coast redwood stands: implications for forest carbon estimation (2012)
    Oxford University Press
    In: Forestry
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    Publication Date: 2012-02-11
    Description: Carbon sequestration and wood volume production will be major objectives of future forestry projects. Optimization of these two objectives will require a better understanding of how management regimes affect stand average wood density and carbon fraction. Two contrasting coast redwood ( Sequoia sempervirens ) sites were chosen for analysis of volume growth rates and tree stem carbon sequestration rates under two management systems—even-aged and multiaged—each with various treatments. A young plantation showed high volume increment and stem carbon sequestration rates in all treatments with the highest in the control plots. Control plots in the plantation had peak periodic volume increment of 75.6 m 3 ha –1 year –1 and a maximum stem carbon sequestration rate of 16.08 tonnes C ha –1 year –1 . The multiaged stand in contrast had the lowest volume and carbon increment in the control plots at 11.97 m 3 ha –1 year –1 and 2.40 tonnes C ha –1 year –1 , respectively. In both the management systems, significant differences were observed in the carbon fraction (mass carbon per unit mass dry wood) of heartwood (HW) and sapwood (SW) at 0.5385 and 0.5293, respectively, implying that increasing the ratio of HW to SW will result in higher average carbon fractions. Carbon density varied between management regimes with the highest values occurring in the multiaged stand indicating the potential for enhancement of carbon sequestration through silvicultural prescriptions. Utilization of standard carbon accounting practices resulted in a systematic underestimate of stand-level carbon stocks for both systems studied of 26 per cent in the even-aged stand and 27 per cent in the multiaged stand.
    Print ISSN: 0015-752X
    Electronic ISSN: 1464-3626
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Oxford University Press
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  • 3
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    Protective CD8+ T-cell immunity to human malaria induced by chimpanzee adenovirus-MVA immunisation (2013)
    Springer Nature
    Details
    Publication Date: 2013-11-30
    Description: Article Induction of protective immunity mediated by CD8 + T cells has been a long sought goal in vaccinology. Here, Ewer et al. report induction of protective efficacy against Plasmodium falciparum malaria in a phase IIa prime-boost vaccine trial where efficacy correlates strongly with induced CD8 T-cell responses. Nature Communications doi: 10.1038/ncomms3836 Authors: Katie J. Ewer, Geraldine A. O’Hara, Christopher J. A. Duncan, Katharine A. Collins, Susanne H. Sheehy, Arturo Reyes-Sandoval, Anna L. Goodman, Nick J. Edwards, Sean C. Elias, Fenella D. Halstead, Rhea J. Longley, Rosalind Rowland, Ian D. Poulton, Simon J. Draper, Andrew M. Blagborough, Eleanor Berrie, Sarah Moyle, Nicola Williams, Loredana Siani, Antonella Folgori, Stefano Colloca, Robert E. Sinden, Alison M. Lawrie, Riccardo Cortese, Sarah C. Gilbert, Alfredo Nicosia, Adrian V. S. Hill
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 4
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    Plant UVR8 photoreceptor senses UV-B by tryptophan-mediated disruption of cross-dimer salt bridges (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-02-11
    Description: The recently identified plant photoreceptor UVR8 (UV RESISTANCE LOCUS 8) triggers regulatory changes in gene expression in response to ultraviolet-B (UV-B) light through an unknown mechanism. Here, crystallographic and solution structures of the UVR8 homodimer, together with mutagenesis and far-UV circular dichroism spectroscopy, reveal its mechanisms for UV-B perception and signal transduction. beta-propeller subunits form a remarkable, tryptophan-dominated, dimer interface stitched together by a complex salt-bridge network. Salt-bridging arginines flank the excitonically coupled cross-dimer tryptophan "pyramid" responsible for UV-B sensing. Photoreception reversibly disrupts salt bridges, triggering dimer dissociation and signal initiation. Mutation of a single tryptophan to phenylalanine retunes the photoreceptor to detect UV-C wavelengths. Our analyses establish how UVR8 functions as a photoreceptor without a prosthetic chromophore to promote plant development and survival in sunlight.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3505452/" 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/PMC3505452/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Christie, John M -- Arvai, Andrew S -- Baxter, Katherine J -- Heilmann, Monika -- Pratt, Ashley J -- O'Hara, Andrew -- Kelly, Sharon M -- Hothorn, Michael -- Smith, Brian O -- Hitomi, Kenichi -- Jenkins, Gareth I -- Getzoff, Elizabeth D -- GM37684/GM/NIGMS NIH HHS/ -- R01 GM037684/GM/NIGMS NIH HHS/ -- Biotechnology and Biological Sciences Research Council/United Kingdom -- New York, N.Y. -- Science. 2012 Mar 23;335(6075):1492-6. doi: 10.1126/science.1218091. Epub 2012 Feb 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22323738" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/physiology ; Arabidopsis Proteins/*chemistry/genetics/*metabolism ; Arginine/chemistry ; Chromosomal Proteins, Non-Histone/*chemistry/genetics/*metabolism ; Circular Dichroism ; Crystallography, X-Ray ; Hydrogen Bonding ; Hydrogen-Ion Concentration ; Light Signal Transduction ; Models, Molecular ; Mutagenesis ; Photoreceptors, Plant/*chemistry/genetics/*metabolism ; Protein Conformation ; Protein Multimerization ; Recombinant Fusion Proteins/chemistry/metabolism ; Tryptophan/chemistry ; *Ultraviolet Rays
    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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  • 5
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    Perception of UV-B by the Arabidopsis UVR8 protein (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-04-02
    Description: To optimize their growth and survival, plants perceive and respond to ultraviolet-B (UV-B) radiation. However, neither the molecular identity of the UV-B photoreceptor nor the photoperception mechanism is known. Here we show that dimers of the UVR8 protein perceive UV-B, probably by a tryptophan-based mechanism. Absorption of UV-B induces instant monomerization of the photoreceptor and interaction with COP1, the central regulator of light signaling. Thereby this signaling cascade controlled by UVR8 mediates UV-B photomorphogenic responses securing plant acclimation and thus promotes survival in sunlight.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rizzini, Luca -- Favory, Jean-Jacques -- Cloix, Catherine -- Faggionato, Davide -- O'Hara, Andrew -- Kaiserli, Eirini -- Baumeister, Ralf -- Schafer, Eberhard -- Nagy, Ferenc -- Jenkins, Gareth I -- Ulm, Roman -- BB/F014961/1/Biotechnology and Biological Sciences Research Council/United Kingdom -- Biotechnology and Biological Sciences Research Council/United Kingdom -- New York, N.Y. -- Science. 2011 Apr 1;332(6025):103-6. doi: 10.1126/science.1200660.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Faculty of Biology, Institute of Biology II, University of Freiburg, D-79104 Freiburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21454788" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis ; Arabidopsis Proteins/*radiation effects ; Chromosomal Proteins, Non-Histone/*radiation effects ; Light Signal Transduction ; Photoreceptors, Plant/physiology ; Sunlight ; Two-Hybrid System Techniques ; *Ultraviolet Rays
    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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  • 6
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    Human 3D cellular model of hypoxic brain injury of prematurity (2019)
    Springer Nature
    Details
    Publication Date: 2019
    Print ISSN: 1078-8956
    Electronic ISSN: 1546-170X
    Topics: Biology , Medicine
    Published by Springer Nature
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