Secreted MD-2 is a large polymeric protein that efficiently confers lipopolysaccharide sensitivity to Toll-like receptor 4.

abstract：:CDK7 is a cyclin-dependent kinase proposed to function in two essential cellular processes: transcription and cell cycle regulation. CDK7 is the kinase subunit of the general transcription factor TFIIH that phosphorylates the C-terminal domain (CTD) of RNA polymerase II, and has been shown to be broadly required for t...

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

authors： Wallenfang MR,Seydoux G

更新日期：2002-04-16 00:00:00

abstract：:The phenotype of several erythromycin-resistant mutants of Chlamydomonas reinhardi was further characterized in terms of the electrophoretic properties of their chloroplast ribosomal proteins. In mutant ery-M2d a single protein of the large (52 S) subunit has altered properties, which probably result from a change in ...

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

authors： Mets L,Bogorad L

更新日期：1972-12-01 00:00:00

abstract：:Studies of the accelerated aging disorder Hutchinson-Gilford progeria syndrome (HGPS) can potentially reveal cellular defects associated with physiological aging. HGPS results from expression and abnormal nuclear envelope association of a farnesylated, truncated variant of prelamin A called "progerin." We surveyed the...

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

authors： Chang W,Wang Y,Luxton GWG,Östlund C,Worman HJ,Gundersen GG

更新日期：2019-02-26 00:00:00

abstract：:The ability of the cornea to transmit light while being mechanically resilient is directly attributable to the formation of an extracellular matrix containing orthogonal sheets of collagen fibrils. The detailed structure of the fibrils and how this structure underpins the mechanical properties and organization of the ...

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

authors： Holmes DF,Gilpin CJ,Baldock C,Ziese U,Koster AJ,Kadler KE

更新日期：2001-06-19 00:00:00

abstract：:Ribonucleoside diphosphate reductase from Escherichia coli and mammalian cells provides the deoxyribonucleoside triphosphates for DNA synthesis. The active enzyme contains a tyrosyl free radical whose formation requires oxygen. Earlier genetic evidence suggested that the enzyme is not required for anaerobic growth of ...

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

authors： Fontecave M,Eliasson R,Reichard P

更新日期：1989-04-01 00:00:00

abstract：:Binding of carbon monoxide and oxygen to sterically protected heme model compounds (basket-handle porphyrins) was investigated in liquid toluene at temperatures from 180 to 300 K by laser flash photolysis. Only a single exponential rebinding process from the solvent could be seen in the time range of 20 nsec to millis...

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

authors： Tetreau C,Lavalette D,Momenteau M,Lhoste JM

更新日期：1987-04-01 00:00:00

abstract：:To understand the pathogenesis that may be induced by human adenovirus type 12 (Ad12), we have generated transgenic mice carrying the Ad12 early region 1 under control of the mouse mammary tumor virus long terminal repeat. Eleven of 11 male founder mice, but only 2 of 12 females, died between 3 to 4 mo of age. Death w...

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

authors： Koike K,Hinrichs SH,Isselbacher KJ,Jay G

更新日期：1989-07-01 00:00:00

abstract：:Critical to the maintenance of circadian rhythmicity is the cyclic expression of at least some components of the central oscillator. High-amplitude cycling of mRNA and protein abundance, protein phosphorylation and nuclear/cytoplasmic shuttling have all been implicated in the maintenance of circadian period. Here we u...

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

authors： Kim WY,Geng R,Somers DE

更新日期：2003-04-15 00:00:00

abstract：:The phytohormone cytokinin influences many aspects of plant growth and development, several of which also involve the cellular process of autophagy, including leaf senescence, nutrient remobilization, and developmental transitions. The Arabidopsis type-A response regulators (type-A ARR) are negative regulators of cyto...

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

authors： Acheampong AK,Shanks C,Cheng CY,Schaller GE,Dagdas Y,Kieber JJ

更新日期：2020-10-27 00:00:00

abstract：:Particles composed of secondary organic material (SOM) are abundant in the lower troposphere. The viscosity of these particles is a fundamental property that is presently poorly quantified yet required for accurate modeling of their formation, growth, evaporation, and environmental impacts. Using two unique techniques...

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

authors： Renbaum-Wolff L,Grayson JW,Bateman AP,Kuwata M,Sellier M,Murray BJ,Shilling JE,Martin ST,Bertram AK

更新日期：2013-05-14 00:00:00

abstract：:Bacteria use membrane-integral sensor histidine kinases (HK) to perceive stimuli and transduce signals from the environment to the cytosol. Information on how the signal is transmitted across the membrane by HKs is still scarce. Combining both liquid- and solid-state NMR, we demonstrate that structural rearrangements ...

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

authors： Salvi M,Schomburg B,Giller K,Graf S,Unden G,Becker S,Lange A,Griesinger C

更新日期：2017-03-21 00:00:00

abstract：:The WWOX gene is a recently cloned tumor suppressor gene that spans the FRA16D fragile region. Wwox protein contains two WW domains that are generally known to mediate protein-protein interaction. Here we show that Wwox physically interacts via its first WW domain with the p53 homolog, p73. The tyrosine kinase, Src, p...

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

authors： Aqeilan RI,Pekarsky Y,Herrero JJ,Palamarchuk A,Letofsky J,Druck T,Trapasso F,Han SY,Melino G,Huebner K,Croce CM

更新日期：2004-03-30 00:00:00

abstract：:Clonal expansion of premalignant lesions is an important step in the progression to cancer. This process is commonly considered to be a consequence of sustaining a proliferative mutation. Here, we investigate whether the growth trajectory of clones can be better described by a model in which clone growth does not depe...

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

authors： Chao DL,Eck JT,Brash DE,Maley CC,Luebeck EG

更新日期：2008-09-30 00:00:00

abstract：:Male relationships in most species of mammals generally are characterized by intense intrasexual competition, with little bonding among unrelated individuals. In contrast, human societies are characterized by high levels of cooperation and strong bonds among both related and unrelated males. The emergence of cooperati...

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

authors： Patzelt A,Kopp GH,Ndao I,Kalbitzer U,Zinner D,Fischer J

更新日期：2014-10-14 00:00:00

abstract：:Reptiles and fish have robust regenerative powers for tooth renewal. However, extant mammals can either renew their teeth one time (diphyodont dentition) or not at all (monophyodont dentition). Humans replace their milk teeth with permanent teeth and then lose their ability for tooth renewal. Here, we study tooth rene...

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

authors： Wu P,Wu X,Jiang TX,Elsey RM,Temple BL,Divers SJ,Glenn TC,Yuan K,Chen MH,Widelitz RB,Chuong CM

更新日期：2013-05-28 00:00:00

abstract：:Let T(k) (epsilon)(lambda; t(1),..., t(k)) = rho(X(t) (1))q(epsilon)(X(t) (2) - X(t) (1))... q(epsilon)(X(t(k) ) - X(t(k) )-1), where X(t) is a Brownian motion in R(2), lambda(dx) = rho(x)dx, and q(epsilon) converges to Dirac's delta function as epsilon downward arrow 0. The self-intersection local times of order k ar...

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

authors： Dynkin EB

更新日期：1986-06-01 00:00:00

abstract：:DsrA is an 87-nucleotide regulatory RNA of Escherichia coli that acts in trans by RNA-RNA interactions with two different mRNAs, hns and rpoS. DsrA has opposite effects on these transcriptional regulators. H-NS levels decrease, whereas RpoS (final sigma(s)) levels increase. Here we show that DsrA enhances hns mRNA tur...

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

authors： Lease RA,Belfort M

更新日期：2000-08-29 00:00:00

abstract：:Salicylic acid (SA) plays an important role in activating various plant defense responses, including expression of the pathogenesis-related (PR) genes and systemic acquired resistance. A critical positive regulator of the SA signaling pathway in Arabidopsis is encoded by the NPR1 gene. However, there is growing eviden...

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

authors： Kachroo P,Shanklin J,Shah J,Whittle EJ,Klessig DF

更新日期：2001-07-31 00:00:00

abstract：:In this report we provide evidence that neuronal nicotinic acetylcholine receptors (nAChRs) are present on hippocampal astrocytes and their activation produces rapid currents and calcium transients. Our data indicate that these responses obtained from astrocytes are primarily mediated by an AChR subtype that is functi...

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

authors： Sharma G,Vijayaraghavan S

更新日期：2001-03-27 00:00:00

abstract：:A recently determined set of 20 NMR-derived conformations of a 48-residue all-alpha-helical protein, (PDB ID code 2JVD), is validated here by comparing the observed (13)C(alpha) chemical shifts with those computed at the density functional level of theory. In addition, a recently introduced physics-based method, aimed...

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

authors： Vila JA,Aramini JM,Rossi P,Kuzin A,Su M,Seetharaman J,Xiao R,Tong L,Montelione GT,Scheraga HA

更新日期：2008-09-23 00:00:00

abstract：:One mechanism of silver resistance in microorganisms is accumulation of the metal ions in the cell. Here, we report on the phenomenon of biosynthesis of silver-based single crystals with well-defined compositions and shapes, such as equilateral triangles and hexagons, in Pseudomonas stutzeri AG259. The crystals were u...

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

authors： Klaus T,Joerger R,Olsson E,Granqvist CG

更新日期：1999-11-23 00:00:00

abstract：:Previous work has uncovered the existence of an Escherichia coli locus, groE, that is essential for bacterial growth, lambda phage and T4 phage head morphogenesis, and T5 phage tail assembly. Our genetic and biochemical analyses of lambda groE+ transducing phages and their deletion and point mutant derivatives show th...

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

authors： Tilly K,Murialdo H,Georgopoulos C

更新日期：1981-03-01 00:00:00

abstract：:Plastid development in seedlings of Arabidopsis thaliana is affected by the transfer of (1)O(2)-mediated retrograde signals from the plastid to the nucleus and changes in nuclear gene expression during late embryogenesis. The potential impact of these mechanisms on plastid differentiation is maintained throughout seed...

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

authors： Kim C,Lee KP,Baruah A,Nater M,Göbel C,Feussner I,Apel K

更新日期：2009-06-16 00:00:00

abstract：:Humans' remarkable ability to quickly and accurately discriminate among thousands of highly similar complex objects demands rapid and precise neural computations. To elucidate the process by which this is achieved, we used magnetoencephalography to measure spatiotemporal patterns of neural activity with high temporal ...

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

authors： Vida MD,Nestor A,Plaut DC,Behrmann M

更新日期：2017-01-10 00:00:00

abstract：:Near-zero-index (NZI) supercoupling, the transmission of electromagnetic waves inside a waveguide irrespective of its shape, is a counterintuitive wave effect that finds applications in optical interconnects and engineering light-matter interactions. However, there is a limited knowledge on the local properties of the...

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

authors： Liberal I,Lobet M,Li Y,Engheta N

更新日期：2020-09-29 00:00:00

abstract：:We report the cloning and characterization of a cancer-associated cell membrane glycoprotein recognized by mAb NCC-3G10. The antibody showed strong reactivity to a wide variety of cancer cells, but only to a limited number of normal cells including lymphocytes, endothelial cells, and basal cells of stratified squamous...

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

authors： Ino Y,Gotoh M,Sakamoto M,Tsukagoshi K,Hirohashi S

更新日期：2002-01-08 00:00:00

abstract：:The chromatin core particle DNA conformation deduced in broad outline by Finch et al. [Finch, J. T., Lutter, L. C., Rhodes, D., Brown, R. S., Rushton, B., Levitt, M. & Klug, A. (1977) Nature 269, 29-36] can be described in detail using other available experimental results. Histone binding sites compatible with the pat...

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

authors： Carter CW Jr

更新日期：1978-08-01 00:00:00

abstract：:We have previously proven that human macrophages can phagocytose porcine cells even in the absence of Ab or complement opsonization, indicating that macrophages present a pivotal immunological obstacle to xenotransplantation. A recent report indicates that the signal regulatory protein (SIRP)alpha is a critical immune...

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

authors： Ide K,Wang H,Tahara H,Liu J,Wang X,Asahara T,Sykes M,Yang YG,Ohdan H

更新日期：2007-03-20 00:00:00

abstract：:Because synaptic vesicle exocytosis is a nano-mechanical process, it should be influenced by the mechanical properties of the cell membrane to which the vesicle fuses. By dissolving surfactants at various concentrations in the neuronal membrane, we have perturbed mechanical properties of the membrane and have found th...

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

authors： Zhu Y,Stevens CF

更新日期：2008-11-18 00:00:00

abstract：:The replication initiator proteins encoded by the pT181 and related plasmids have sequence-specific DNA binding and topoisomerase activities. These proteins create a site-specific nick in one strand of the DNA at the origin of replication that serves as a primer for the initiation of replication. To define the regions...

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

authors： Dempsey LA,Birch P,Khan SA

更新日期：1992-04-01 00:00:00