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Proceedings of the National Academy of Sciences of the United States of America

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https://www.readbyqxmd.com/read/28550106/the-fibrous-cellular-microenvironment-and-how-cells-make-sense-of-a-tangled-web
#1
Delaram Shakiba, Behzad Babaei, Fatemeh Saadat, Stavros Thomopoulos, Guy M Genin
No abstract text is available yet for this article.
May 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28550105/global-biodiversity-loss-from-tropical-deforestation
#2
Xingli Giam
No abstract text is available yet for this article.
May 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28539436/nontrivial-berry-phase-in-magnetic-bamnsb2-semimetal
#3
Silu Huang, Jisun Kim, W A Shelton, E W Plummer, Rongying Jin
The subject of topological materials has attracted immense attention in condensed-matter physics because they host new quantum states of matter containing Dirac, Majorana, or Weyl fermions. Although Majorana fermions can only exist on the surface of topological superconductors, Dirac and Weyl fermions can be realized in both 2D and 3D materials. The latter are semimetals with Dirac/Weyl cones either not tilted (type I) or tilted (type II). Although both Dirac and Weyl fermions have massless nature with the nontrivial Berry phase, the formation of Weyl fermions in 3D semimetals require either time-reversal or inversion symmetry breaking to lift degeneracy at Dirac points...
May 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536204/unesco-mab-biosphere-reserves-already-deal-with-ecosystem-services-and-sustainable-development
#4
LETTER
Peter Bridgewater, Didier Babin
No abstract text is available yet for this article.
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536203/reply-to-bridgewater-and-babin-need-for-a-new-protected-area-category-for-ecosystem-services
#5
Weihua Xu, Yi Xiao, Jingjing Zhang, Wu Yang, Lu Zhang, Vanessa Hull, Zhi Wang, Hua Zheng, Jianguo Liu, Stephen Polasky, Ling Jiang, Yang Xiao, Xuewei Shi, Enming Rao, Fei Lu, Xiaoke Wang, Gretchen C Daily, Zhiyun Ouyang
No abstract text is available yet for this article.
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536202/conclusion-that-fishing-induced-evolution-is-negligible-follows-from-model-assumptions
#6
LETTER
Katja Enberg, Christian Jørgensen
No abstract text is available yet for this article.
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536201/reply-to-enberg-and-j%C3%A3-rgensen-ecology-and-evolution-both-matter-for-explaining-stock-dynamics
#7
Anne Maria Eikeset, Erin S Dunlop, Mikko Heino, Geir Storvik, Nils C Stenseth, Ulf Dieckmann
No abstract text is available yet for this article.
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536200/modulation-of-sensory-information-processing-by-a-neuroglobin-in-caenorhabditis-elegans
#8
Shigekazu Oda, Yu Toyoshima, Mario de Bono
Sensory receptor neurons match their dynamic range to ecologically relevant stimulus intensities. How this tuning is achieved is poorly understood in most receptors. The roundworm Caenorhabditis elegans avoids 21% O2 and hypoxia and prefers intermediate O2 concentrations. We show how this O2 preference is sculpted by the antagonistic action of a neuroglobin and an O2-binding soluble guanylate cyclase. These putative molecular O2 sensors confer a sigmoidal O2 response curve in the URX neurons that has highest slope between 15 and 19% O2 and approaches saturation when O2 reaches 21%...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536199/active-depinning-of-bacterial-droplets-the-collective-surfing-of-bacillus-subtilis
#9
Marc Hennes, Julien Tailleur, Gaëlle Charron, Adrian Daerr
How systems are endowed with migration capacity is a fascinating question with implications ranging from the design of novel active systems to the control of microbial populations. Bacteria, which can be found in a variety of environments, have developed among the richest set of locomotion mechanisms both at the microscopic and collective levels. Here, we uncover, experimentally, a mode of collective bacterial motility in humid environment through the depinning of bacterial droplets. Although capillary forces are notoriously enormous at the bacterial scale, even capable of pinning water droplets of millimetric size on inclined surfaces, we show that bacteria are able to harness a variety of mechanisms to unpin contact lines, hence inducing a collective slipping of the colony across the surface...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536198/understanding-the-essential-proton-pumping-kinetic-gates-and-decoupling-mutations-in-cytochrome-c-oxidase
#10
Ruibin Liang, Jessica M J Swanson, Mårten Wikström, Gregory A Voth
Cytochrome c oxidase (CcO) catalyzes the reduction of oxygen to water and uses the released free energy to pump protons against the transmembrane proton gradient. To better understand the proton-pumping mechanism of the wild-type (WT) CcO, much attention has been given to the mutation of amino acid residues along the proton translocating D-channel that impair, and sometimes decouple, proton pumping from the chemical catalysis. Although their influence has been clearly demonstrated experimentally, the underlying molecular mechanisms of these mutants remain unknown...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536197/melting-dynamics-of-ice-in-the-mesoscopic-regime
#11
Margherita Citroni, Samuele Fanetti, Naomi Falsini, Paolo Foggi, Roberto Bini
How does a crystal melt? How long does it take for melt nuclei to grow? The melting mechanisms have been addressed by several theoretical and experimental works, covering a subnanosecond time window with sample sizes of tens of nanometers and thus suitable to determine the onset of the process but unable to unveil the following dynamics. On the other hand, macroscopic observations of phase transitions, with millisecond or longer time resolution, account for processes occurring at surfaces and time limited by thermal contact with the environment...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536196/physicochemical-code-for-quinary-protein-interactions-in-escherichia-coli
#12
Xin Mu, Seongil Choi, Lisa Lang, David Mowray, Nikolay V Dokholyan, Jens Danielsson, Mikael Oliveberg
How proteins sense and navigate the cellular interior to find their functional partners remains poorly understood. An intriguing aspect of this search is that it relies on diffusive encounters with the crowded cellular background, made up of protein surfaces that are largely nonconserved. The question is then if/how this protein search is amenable to selection and biological control. To shed light on this issue, we examined the motions of three evolutionary divergent proteins in the Escherichia coli cytoplasm by in-cell NMR...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536195/discovery-of-a-widespread-metabolic-pathway-within-and-among-phenolic-xenobiotics
#13
Pahriya Ashrap, Guomao Zheng, Yi Wan, Tong Li, Wenxin Hu, Wenjuan Li, Hong Zhang, Zhaobin Zhang, Jianying Hu
Metabolism is an organism's primary defense against xenobiotics, yet it also increases the production of toxic metabolites. It is generally recognized that phenolic xenobiotics, a group of ubiquitous endocrine disruptors, undergo rapid phase II metabolism to generate more water-soluble glucuronide and sulfate conjugates as a detoxification pathway. However, the toxicological effects of the compounds invariably point to the phase I metabolic cytochrome P450 enzymes. Here we show that phenolic xenobiotics undergo an unknown metabolic pathway to form more lipophilic and bioactive products...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536194/wild-tobacco-genomes-reveal-the-evolution-of-nicotine-biosynthesis
#14
Shuqing Xu, Thomas Brockmöller, Aura Navarro-Quezada, Heiner Kuhl, Klaus Gase, Zhihao Ling, Wenwu Zhou, Christoph Kreitzer, Mario Stanke, Haibao Tang, Eric Lyons, Priyanka Pandey, Shree P Pandey, Bernd Timmermann, Emmanuel Gaquerel, Ian T Baldwin
Nicotine, the signature alkaloid of Nicotiana species responsible for the addictive properties of human tobacco smoking, functions as a defensive neurotoxin against attacking herbivores. However, the evolution of the genetic features that contributed to the assembly of the nicotine biosynthetic pathway remains unknown. We sequenced and assembled genomes of two wild tobaccos, Nicotiana attenuata (2.5 Gb) and Nicotiana obtusifolia (1.5 Gb), two ecological models for investigating adaptive traits in nature. We show that after the Solanaceae whole-genome triplication event, a repertoire of rapidly expanding transposable elements (TEs) bloated these Nicotiana genomes, promoted expression divergences among duplicated genes, and contributed to the evolution of herbivory-induced signaling and defenses, including nicotine biosynthesis...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28536193/the-ferm-protein-epb41l5-regulates-actomyosin-contractility-and-focal-adhesion-formation-to-maintain-the-kidney-filtration-barrier
#15
Christoph Schell, Manuel Rogg, Martina Suhm, Martin Helmstädter, Dominik Sellung, Mako Yasuda-Yamahara, Oliver Kretz, Victoria Küttner, Hani Suleiman, Laxmikanth Kollipara, René P Zahedi, Albert Sickmann, Stefan Eimer, Andrey S Shaw, Albrecht Kramer-Zucker, Mariko Hirano-Kobayashi, Takaya Abe, Shinichi Aizawa, Florian Grahammer, Björn Hartleben, Jörn Dengjel, Tobias B Huber
Podocytes form the outer part of the glomerular filter, where they have to withstand enormous transcapillary filtration forces driving glomerular filtration. Detachment of podocytes from the glomerular basement membrane precedes most glomerular diseases. However, little is known about the regulation of podocyte adhesion in vivo. Thus, we systematically screened for podocyte-specific focal adhesome (FA) components, using genetic reporter models in combination with iTRAQ-based mass spectrometry. This approach led to the identification of FERM domain protein EPB41L5 as a highly enriched podocyte-specific FA component in vivo...
May 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533419/dna-replication-and-mismatch-repair-safeguard-against-metabolic-imbalances
#16
Carol M Manhart, Eric Alani
No abstract text is available yet for this article.
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533418/hdac1-links-early-life-stress-to-schizophrenia-like-phenotypes
#17
Sanaz Bahari-Javan, Hristo Varbanov, Rashi Halder, Eva Benito, Lalit Kaurani, Susanne Burkhardt, Heike Anderson-Schmidt, Ion Anghelescu, Monika Budde, Roman M Stilling, Joan Costa, Juan Medina, Detlef E Dietrich, Christian Figge, Here Folkerts, Katrin Gade, Urs Heilbronner, Manfred Koller, Carsten Konrad, Sara Y Nussbeck, Harald Scherk, Carsten Spitzer, Sebastian Stierl, Judith Stöckel, Andreas Thiel, Martin von Hagen, Jörg Zimmermann, Antje Zitzelsberger, Sybille Schulz, Andrea Schmitt, Ivana Delalle, Peter Falkai, Thomas G Schulze, Alexander Dityatev, Farahnaz Sananbenesi, André Fischer
Schizophrenia is a devastating disease that arises on the background of genetic predisposition and environmental risk factors, such as early life stress (ELS). In this study, we show that ELS-induced schizophrenia-like phenotypes in mice correlate with a widespread increase of histone-deacetylase 1 (Hdac1) expression that is linked to altered DNA methylation. Hdac1 overexpression in neurons of the medial prefrontal cortex, but not in the dorsal or ventral hippocampus, mimics schizophrenia-like phenotypes induced by ELS...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533417/the-natural-productome
#18
Andrea M E Palazzolo, Claire L W Simons, Martin D Burke
No abstract text is available yet for this article.
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533416/retracing-zika-s-footsteps-across-the-americas-with-computational-modeling
#19
T Alex Perkins
No abstract text is available yet for this article.
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533415/mechanistic-insight-into-the-nucleus-vacuole-junction-based-on-the-vac8p-nvj1p-crystal-structure
#20
Hanbin Jeong, Jumi Park, Hye-In Kim, Miriam Lee, Young-Joon Ko, Sanghwa Lee, Youngsoo Jun, Changwook Lee
Formation of the nucleus-vacuole junction (NVJ) is mediated by direct interaction between the vacuolar protein Vac8p and the outer nuclear endoplasmic reticulum membrane protein Nvj1p. Herein we report the crystal structure of Vac8p bound to Nvj1p at 2.4-Å resolution. Vac8p comprises a flexibly connected N-terminal H1 helix followed by 12 armadillo repeats (ARMs) that form a right-handed superhelical structure. The extended 80-Å-long loop of Nvj1p specifically binds the highly conserved inner groove formed from ARM1-12 of Vac8p...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
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