Chloroplast DNA inversions and the origin of the grass family (Poaceae).

abstract：:It has been nearly 40 y since it was suggested that genomic methylation patterns could be transmitted via maintenance methylation during S phase and might play a role in the dynamic regulation of gene expression during development [Holliday R, Pugh JE (1975) Science 187(4173):226-232; Riggs AD (1975) Cytogenet Cell Ge...

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

authors： Bestor TH,Edwards JR,Boulard M

更新日期：2015-06-02 00:00:00

abstract：:Criegee intermediates are thought to play a role in atmospheric chemistry, in particular, the oxidation of SO2, which produces SO3 and subsequently H2SO4, an important constituent of aerosols and acid rain. However, the impact of such oxidation reactions is affected by the reactions of Criegee intermediates with water...

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

authors： Huang HL,Chao W,Lin JJ

更新日期：2015-09-01 00:00:00

abstract：:Animal epithelial tissue becomes reproducibly colonized by specific environmental bacteria. The bacteria (microbiota) perform critical functions for the host's tissue development, immune system development, and nutrition; yet the processes by which bacterial diversity in the environment is selected to assemble the cor...

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

authors： Brooks JF 2nd,Gyllborg MC,Cronin DC,Quillin SJ,Mallama CA,Foxall R,Whistler C,Goodman AL,Mandel MJ

更新日期：2014-12-02 00:00:00

abstract：:Guanosine tetraphosphate, recently discovered to mediate the regulatory relationship between protein synthesis and RNA accumulation in various bacteria, has been synthesized in vitro in large quantities and analyzed by natural-abundance (13)C nuclear magnetic resonance spectroscopy in order to confirm its structure an...

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

authors： Que L Jr,Willie GR,Cashel M,Bodley JW,Gray GR

更新日期：1973-09-01 00:00:00

abstract：:The flavin cofactor in photoenzyme photolyase and photoreceptor cryptochrome may exist in an oxidized state and should be converted into reduced state(s) for biological functions. Such redox changes can be efficiently achieved by photoinduced electron transfer (ET) through a series of aromatic residues in the enzyme. ...

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

authors： Liu Z,Tan C,Guo X,Li J,Wang L,Sancar A,Zhong D

更新日期：2013-08-06 00:00:00

abstract：:This article reports the development of an optical imaging technique, confocal light absorption and scattering spectroscopic (CLASS) microscopy, capable of noninvasively determining the dimensions and other physical properties of single subcellular organelles. CLASS microscopy combines the principles of light-scatteri...

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

authors： Itzkan I,Qiu L,Fang H,Zaman MM,Vitkin E,Ghiran IC,Salahuddin S,Modell M,Andersson C,Kimerer LM,Cipolloni PB,Lim KH,Freedman SD,Bigio I,Sachs BP,Hanlon EB,Perelman LT

更新日期：2007-10-30 00:00:00

abstract：:The structure of cellulose microfibrils in wood is not known in detail, despite the abundance of cellulose in woody biomass and its importance for biology, energy, and engineering. The structure of the microfibrils of spruce wood cellulose was investigated using a range of spectroscopic methods coupled to small-angle ...

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

authors： Fernandes AN,Thomas LH,Altaner CM,Callow P,Forsyth VT,Apperley DC,Kennedy CJ,Jarvis MC

更新日期：2011-11-22 00:00:00

abstract：:A library of amphiphilic Janus dendrimers including two that are fluorescent and one glycodendrimer presenting lactose were used to construct giant dendrimersomes and glycodendrimersomes. Coassembly with the components of bacterial membrane vesicles by a dehydration-rehydration process generated giant cell-like hybrid...

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

authors： Xiao Q,Yadavalli SS,Zhang S,Sherman SE,Fiorin E,da Silva L,Wilson DA,Hammer DA,André S,Gabius HJ,Klein ML,Goulian M,Percec V

更新日期：2016-03-01 00:00:00

abstract：:The identity of the oldest lineage of monocotyledons is a subject of debate. Alternative interpretations of morphological homologies are variously consistent with proposals that species of Alismatanae, Dioscoreales, or Melanthiales were the earliest descendants of the first monocotyledons. We present phylogenetic anal...

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

authors： Duvall MR,Learn GH Jr,Eguiarte LE,Clegg MT

更新日期：1993-05-15 00:00:00

abstract：:Controlled maturation of ovarian follicles is necessary for fertility. Follicles are restrained at an immature stage until stimulated by FSH secreted by pituitary gonadotropes. FSH acts on granulosa cells within the immature follicle to inhibit apoptosis, promote proliferation, stimulate production of steroid and prot...

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

authors： Hunzicker-Dunn ME,Lopez-Biladeau B,Law NC,Fiedler SE,Carr DW,Maizels ET

更新日期：2012-10-30 00:00:00

abstract：:Polycomb group proteins are essential regulators of developmental processes across animals. Despite their importance, studies on Polycomb are often restricted to classical model systems and, as such, little is known about the evolution of these important chromatin regulators. Here we focus on Polycomb Repressive Compl...

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

authors： Gahan JM,Rentzsch F,Schnitzler CE

更新日期：2020-09-15 00:00:00

abstract：:Psychedelic drugs have a long history of use in healing ceremonies, but despite renewed interest in their therapeutic potential, we continue to know very little about how they work in the brain. Here we used psilocybin, a classic psychedelic found in magic mushrooms, and a task-free functional MRI (fMRI) protocol desi...

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

authors： Carhart-Harris RL,Erritzoe D,Williams T,Stone JM,Reed LJ,Colasanti A,Tyacke RJ,Leech R,Malizia AL,Murphy K,Hobden P,Evans J,Feilding A,Wise RG,Nutt DJ

更新日期：2012-02-07 00:00:00

abstract：:Cyclooxygenase-2 (COX-2) expression is induced by mitogenic and proinflammatory factors. Its overexpression plays a causal role in inflammation and tumorigenesis. COX-2 expression is tightly regulated, but the mechanisms are largely unclear. Here we show the control of COX-2 expression by an endogenous tryptophan meta...

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

authors： Cheng HH,Kuo CC,Yan JL,Chen HL,Lin WC,Wang KH,Tsai KK,Guvén H,Flaberg E,Szekely L,Klein G,Wu KK

更新日期：2012-08-14 00:00:00

abstract：:Electrical stimulation of the primary spines (greater than 10 cm long) of the tropical sea urchin Diadema antillarum elicits graded compound action potentials that are conducted at a constant speed of approximately equal to 27 cm/sec. Ion substitution experiments suggest that these are due to the summation of calcium ...

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

authors： Smith DS,Brink D,del Castillo J

更新日期：1985-03-01 00:00:00

abstract：:Rev-Erbβ is a nuclear receptor that couples circadian rhythm, metabolism, and inflammation. Heme binding to the protein modulates its function as a repressor, its stability, its ability to bind other proteins, and its activity in gas sensing. Rev-Erbβ binds Fe3+-heme more tightly than Fe2+-heme, suggesting its activit...

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

authors： Sarkar A,Carter EL,Harland JB,Speelman AL,Lehnert N,Ragsdale SW

更新日期：2021-01-19 00:00:00

abstract：:Actin polymerization and assembly into stress fibers (SFs) is central to many cellular processes. However, how SFs form in response to the mechanical interaction of cells with their environment is not fully understood. Here we have identified Piezo2 mechanosensitive cationic channel as a transducer of environmental ph...

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

authors： Pardo-Pastor C,Rubio-Moscardo F,Vogel-González M,Serra SA,Afthinos A,Mrkonjic S,Destaing O,Abenza JF,Fernández-Fernández JM,Trepat X,Albiges-Rizo C,Konstantopoulos K,Valverde MA

更新日期：2018-02-20 00:00:00

abstract：:Cells are wrapped in inelastic membranes, yet they can sustain large mechanical strains by regulating their area. The area regulation in cells is achieved either by membrane folding or by membrane exo- and endocytosis. These processes involve complex morphological transformations of the cell membrane, i.e., invaginati...

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

authors： Staykova M,Holmes DP,Read C,Stone HA

更新日期：2011-05-31 00:00:00

abstract：:Expansion of polyglutamine repeats in several unrelated proteins causes neurodegenerative diseases with distinct but related pathologies. To provide a model system for investigating common pathogenic features, we have examined the behavior of polyglutamine expansions expressed in Caenorhabditis elegans. The expression...

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

authors： Satyal SH,Schmidt E,Kitagawa K,Sondheimer N,Lindquist S,Kramer JM,Morimoto RI

更新日期：2000-05-23 00:00:00

abstract：:We have found the two-dimensional electrophoretic technique of O'Farrell to be highly efficient in the detection of charge-change substitutions in a large number of proteins. We have applied this method to determine the level of heterozygosity of the most abundant proteins in Drosophila melanogaster adults from a natu...

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

authors： Brown AJ,Langley CH

更新日期：1979-05-01 00:00:00

abstract：:Without sufficient greenhouse gases in the atmosphere, the early Earth would have become a permanently frozen planet because the young Sun was less luminous than it is today. Several resolutions to this faint young Sun-frozen Earth paradox have been proposed, with an atmosphere rich in CO2 being the one generally favo...

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

authors： Bada JL,Bigham C,Miller SL

更新日期：1994-02-01 00:00:00

abstract：:A gamma-trace variant protein is the major constituent of the amyloid fibrils in patients from Iceland with hereditary cerebral hemorrhage with amyloidosis. The protein consists of 110 residues and is similar to human urinary gamma-trace basic protein (or cystatin C) beginning at its 11th amino-terminal residue. It ha...

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

authors： Ghiso J,Jensson O,Frangione B

更新日期：1986-05-01 00:00:00

abstract：:Phylogenetic comparison of rRNA sequences has suggested that a pseudoknot structure exists in the central domain of small-subunit rRNA. In Escherichia coli 16S rRNA, this pseudoknot would form when positions 570 and 571 pair with positions 865 and 866. Mutations were introduced into this pseudoknot at the phylogenetic...

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

authors： Vila A,Viril-Farley J,Tapprich WE

更新日期：1994-11-08 00:00:00

abstract：:A method for assessing genomic similarity based on relative abundances of short oligonucleotides in large DNA samples is introduced. The method requires neither homologous sequences nor prior sequence alignments. The analysis centers on (i) dinucleotide (and tri- and tetra-) relative abundance extremes in genomic sequ...

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

authors： Karlin S,Ladunga I

更新日期：1994-12-20 00:00:00

abstract：:Cardiotoxin VII4 from Naja mossambica mossambica crystallizes in space group P61 (a = b = 73.9 A; c = 59.0 A) with two molecules of toxin (molecular mass = 6715 Da) in the asymmetric unit. The structure was solved by using a combination of multiple isomorphous replacement and density modification methods. Model buildi...

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

authors： Rees B,Samama JP,Thierry JC,Gilibert M,Fischer J,Schweitz H,Lazdunski M,Moras D

更新日期：1987-05-01 00:00:00

abstract：:Ethionamide (ETA) is an important component of second-line therapy for the treatment of multidrug-resistant tuberculosis. Synthesis of radiolabeled ETA and an examination of drug metabolites formed by whole cells of Mycobacterium tuberculosis (MTb) have allowed us to demonstrate that ETA is activated by S-oxidation be...

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

authors： DeBarber AE,Mdluli K,Bosman M,Bekker LG,Barry CE 3rd

更新日期：2000-08-15 00:00:00

abstract：:A unique multicomponent vaccine against serogroup B meningococci incorporates the novel genome-derived proteins fHbp, NHBA, and NadA that may vary in sequence and level of expression. Measuring the effectiveness of such vaccines, using the accepted correlate of protection against invasive meningococcal disease, could ...

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

authors： Donnelly J,Medini D,Boccadifuoco G,Biolchi A,Ward J,Frasch C,Moxon ER,Stella M,Comanducci M,Bambini S,Muzzi A,Andrews W,Chen J,Santos G,Santini L,Boucher P,Serruto D,Pizza M,Rappuoli R,Giuliani MM

更新日期：2010-11-09 00:00:00

abstract：:The class II transactivator (CIITA) is the master integrator of expression of MHC class II genes. It interacts with variety of basal transcription factors to initiate and elongate transcription of these genes. Among others, it recruits positive transcription elongation factor b (P-TEFb) to MHC class II promoters. In c...

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

authors： Kohoutek J,Blazek D,Peterlin BM

更新日期：2006-11-14 00:00:00

abstract：:Embryonal rhabdomyosarcoma (ERMS) is a common pediatric malignancy of muscle, with relapse being the major clinical challenge. Self-renewing tumor-propagating cells (TPCs) drive cancer relapse and are confined to a molecularly definable subset of ERMS cells. To identify drugs that suppress ERMS self-renewal and induce...

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

authors： Chen EY,DeRan MT,Ignatius MS,Grandinetti KB,Clagg R,McCarthy KM,Lobbardi RM,Brockmann J,Keller C,Wu X,Langenau DM

更新日期：2014-04-08 00:00:00

abstract：:The basolateral membranes of Aplysia californica foregut absorptive cells contain both Cl(-)-stimulated ATPase and ATP-dependent Cl- transport activities, and each was inhibited by orthovanadate. Both of these orthovanadate-sensitive activities were reconstituted into proteoliposomes. The reaction sequence kinetics we...

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

authors： Gerencser GA,Zelezna B

更新日期：1993-09-01 00:00:00

abstract：:Prion disease is characterized by the alpha-->beta structural conversion of the cellular prion protein (PrP(C)) into the misfolded and aggregated "scrapie" (PrP(Sc)) isoform. It has been speculated that methionine (Met) oxidation in PrP(C) may have a special role in this process, but has not been detailed and assigned...

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

authors： Wolschner C,Giese A,Kretzschmar HA,Huber R,Moroder L,Budisa N

更新日期：2009-05-12 00:00:00