Biosynthesis of the enediyne antitumor antibiotic C-1027 involves a new branching point in chorismate metabolism.

abstract：:An enconuclease activity that reacts with x-irradiated DNA is present in extracts of E. coli. By using centrifugal methods to monitor the conversion of the supercoiled, circular double-stranded DNA for phage phi-x-174 (replicative form) or PM2 to the relaxed circular form it was possible to quantitate the rate of radi...

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

authors： Strniste GF,Wallace SS

更新日期：1975-06-01 00:00:00

abstract：:Most neurotransmission is mediated by action potentials, whereas sensory neurons propagate electrical signals passively and release neurotransmitter in a graded manner. Here, we demonstrate that Caenorhabditis elegans neuromuscular junctions release neurotransmitter in a graded fashion. When motor neurons were depolar...

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

authors： Liu Q,Hollopeter G,Jorgensen EM

更新日期：2009-06-30 00:00:00

abstract：:gamma-Aminobutyric acid type A (GABA-A) receptors are a major mediator of inhibitory neurotransmission in the mammalian central nervous system, and the site of action of a number of clinically important drugs. These receptors exist as a family of subtypes with distinct temporal and spatial patterns of expression and d...

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

authors： Bonnert TP,McKernan RM,Farrar S,le Bourdellès B,Heavens RP,Smith DW,Hewson L,Rigby MR,Sirinathsinghji DJ,Brown N,Wafford KA,Whiting PJ

更新日期：1999-08-17 00:00:00

abstract：:We have investigated the role of cAMP in NO- and prostanoid-independent relaxations that are widely attributed to an endothelium-derived hyperpolarizing factor (EDHF). Under control conditions EDHF-type relaxations evoked by acetylcholine (ACh) in rabbit iliac arteries were transient, but in the presence of the cAMP p...

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

authors： Griffith TM,Chaytor AT,Taylor HJ,Giddings BD,Edwards DH

更新日期：2002-04-30 00:00:00

abstract：:The liver plays a key role in the regulation of circulating levels of low density lipoproteins (LDL) because it is both the site for the production of and the major organ for the degradation of this class of lipoproteins. In this study, the effects of feeding polyunsaturated or saturated triacylglycerols on receptor-d...

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

authors： Spady DK,Dietschy JM

更新日期：1985-07-01 00:00:00

abstract：:A purified rabbit liver membrane protein that binds desialylated glycoproteins has been shown to be a mitogen for human peripheral lymphocytes. The mitogenic activity is specific for desialylated thymus-derived (T)-cells. The loss of mitogenicity upon exposure of the binding protein to neuraminidase and the inhibitory...

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

authors： Novogrodsky A,Ashwell G

更新日期：1977-02-01 00:00:00

abstract：:This study describes the photochemical deposition of Co-based oxygen evolution catalysts on a semiconductor photoanode for use in solar oxygen evolution. In the photodeposition process, electron-hole pairs are generated in a semiconductor upon illumination and the photogenerated holes are used to oxidize Co(2+) ions t...

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

authors： Steinmiller EM,Choi KS

更新日期：2009-12-08 00:00:00

abstract：:IFN-alpha/beta plays an essential role in innate immunity against viral and bacterial infection. Among the proteins induced by IFN-alpha/beta are the ubiquitin-like ISG15 protein and its E1- (Ube1L) and E2- (UbcH8) conjugating enzymes, leading to the conjugation of ISG15 to cellular proteins. It is likely that ISG15 c...

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

authors： Zhao C,Denison C,Huibregtse JM,Gygi S,Krug RM

更新日期：2005-07-19 00:00:00

abstract：:Somatic crossing over in flies heterozygous for a dominant Minute mutant may result in two cells, homozygous for wild type and Minute, respectively. If both cells took part in development, a twin spot of two genotypes, different from the rest of the body, would result. Two-hundred wild type spots were found, none of w...

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

authors： Stern C,Tokunaga C

更新日期：1971-02-01 00:00:00

abstract：:An enduring question in correlated systems concerns whether superconductivity is favored at a quantum critical point (QCP) characterized by a divergent quasiparticle effective mass. Despite such a scenario being widely postulated in high T(c) cuprates and invoked to explain non-Fermi liquid transport signatures, exper...

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

authors： Sebastian SE,Harrison N,Altarawneh MM,Mielke CH,Liang R,Bonn DA,Hardy WN,Lonzarich GG

更新日期：2010-04-06 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：:Estrogens control many physiological and behavioral processes, some of which are connected to reproduction. These include sexual and other social behaviors. Here we implicate four gene products in a micronet required for mammalian social recognition, through which an individual learns to recognize other individuals. F...

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

authors： Choleris E,Gustafsson JA,Korach KS,Muglia LJ,Pfaff DW,Ogawa S

更新日期：2003-05-13 00:00:00

abstract：:Fas is a cell surface death receptor that regulates peripheral tolerance and lymphoid homeostasis. In many pathologic conditions, ectopic Fas activation mediates tissue destruction. Several proteins that can bind to the cytoplasmic death domain of Fas have been implicated in Fas signal transduction. Here we show that ...

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

authors： Chang HY,Yang X,Baltimore D

更新日期：1999-02-16 00:00:00

abstract：:Climate change is expected to alter the distribution and abundance of many species. Predictions of climate-induced population extinctions are supported by geographic range shifts that correspond to climatic warming, but few extinctions have been linked mechanistically to climate change. Here we show that extinctions o...

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

authors： McLaughlin JF,Hellmann JJ,Boggs CL,Ehrlich PR

更新日期：2002-04-30 00:00:00

abstract：:We explored the conformational landscape of the proteinogenic amino acid serine [CH(2)OH CH(NH(2)) COOH] in the gas phase. Solid serine was vaporized by laser ablation, expanded in a supersonic jet, and characterized by Fourier transform microwave spectroscopy. In the isolation conditions of the jet there have been di...

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

authors： Blanco S,Sanz ME,López JC,Alonso JL

更新日期：2007-12-18 00:00:00

abstract：:Conversion of carbon dioxide into hydrocarbons using solar energy is an attractive strategy for storing such a renewable source of energy into the form of chemical energy (a fuel). This can be achieved in a system coupling a photovoltaic (PV) cell to an electrochemical cell (EC) for CO2 reduction. To be beneficial and...

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

authors： Huan TN,Dalla Corte DA,Lamaison S,Karapinar D,Lutz L,Menguy N,Foldyna M,Turren-Cruz SH,Hagfeldt A,Bella F,Fontecave M,Mougel V

更新日期：2019-05-14 00:00:00

abstract：:Transient Receptor Potential Melastatin-8 (TRPM8), a recently identified member of the transient receptor potential (TRP) family of ion channels, is activated by mild cooling and by chemical compounds such as the supercooling agent, icilin. Since cooling, possibly involving TRPM8 stimulation, diminishes injury-induced...

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

authors： Ramachandran R,Hyun E,Zhao L,Lapointe TK,Chapman K,Hirota CL,Ghosh S,McKemy DD,Vergnolle N,Beck PL,Altier C,Hollenberg MD

更新日期：2013-04-30 00:00:00

abstract：:Intracellular transport is interspersed with frequent reversals in direction due to the presence of opposing kinesin and dynein motors on organelles that are carried as cargo. The cause and the mechanism of reversals are unknown, but are a key to understanding how cargos are delivered in a regulated manner to specific...

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

authors： Soppina V,Rai AK,Ramaiya AJ,Barak P,Mallik R

更新日期：2009-11-17 00:00:00

abstract：:Leaflets of Samanea saman open and close rhythmically, driven by an endogenous circadian clock. Light has a rapid, direct effect on the movements and also rephases the rhythm. We investigated whether light signals might be mediated by increased inositolphospholipid turnover, a mechanism for signal transduction that is...

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

authors： Morse MJ,Crain RC,Satter RL

更新日期：1987-10-01 00:00:00

abstract：:Tumor necrosis factor (TNF) is a macrophage product under active study as an anticancer drug. However, this agent can be very toxic and has been implicated in the pathogenesis of endotoxic shock. After intravenous injection of human recombinant TNF (4 micrograms/g), growing rats showed an unusual constellation of phys...

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

authors： Kettelhut IC,Fiers W,Goldberg AL

更新日期：1987-06-01 00:00:00

abstract：:The high-affinity (K(m) = 3 x 10(-8) M) transport system for histidine in Salmonella typhimurium has been resolved into three components: J, K, and P. J, which is a histidine-binding protein released by osmotic shock, is specified by the hisJ gene: hisJ mutants lack the binding protein and are defective in histidine t...

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

authors： Ames GF,Lever J

更新日期：1970-08-01 00:00:00

abstract：:Recent analysis of complete eukaryotic genome sequences has revealed that gene duplication has been rampant. Moreover, next to a continuous mode of gene duplication, in many eukaryotic organisms the complete genome has been duplicated in their evolutionary past. Such large-scale gene duplication events have been assoc...

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

authors： Maere S,De Bodt S,Raes J,Casneuf T,Van Montagu M,Kuiper M,Van de Peer Y

更新日期：2005-04-12 00:00:00

abstract：:Structural differences between dynein and kinesin suggest a unique molecular mechanism of dynein motility. Measuring the mechanical properties of a single molecule of dynein is crucial for revealing the mechanisms underlying its movement. We measured the step size and force produced by single molecules of active cytop...

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

authors： Toba S,Watanabe TM,Yamaguchi-Okimoto L,Toyoshima YY,Higuchi H

更新日期：2006-04-11 00:00:00

abstract：:Interleukin 2 (IL-2) occupies a central position in the cascade of events involved in the immune response. We were interested in determining whether IL-2 could function as an adjuvant to vaccination, to increase the immune response to vaccine immunogens. Using the National Institutes of Health test for rabies vaccine ...

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

authors： Nunberg JH,Doyle MV,York SM,York CJ

更新日期：1989-06-01 00:00:00

abstract：:By using clones of murine T cells reactive with alloantigens as well as soluble antigens, it has been possible to demonstrate that Ia antigens, Ir gene phenomena (defined as the ability of immune T cells to recognize antigen), and mixed lymphocyte reaction (MLR)-stimulating determinants encoded within the I-A subregio...

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

authors： Fathman CG,Kimoto M,Melvold R,David CS

更新日期：1981-03-01 00:00:00

abstract：:Iron is an essential nutrient for the survival of most organisms and has played a central role in the virulence of many infectious disease pathogens. Mycobacterial IdeR is an iron-dependent repressor that shows 80% identity in the functional domains with its corynebacterial homologue, DtxR (diphtheria toxin repressor)...

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

authors： Manabe YC,Saviola BJ,Sun L,Murphy JR,Bishai WR

更新日期：1999-10-26 00:00:00

abstract：:Guanylin and uroguanylin are intestinal peptides that stimulate chloride secretion by activating a common set of receptor-guanylate cyclase signaling molecules located on the mucosal surface of enterocytes. High mucosal acidity, similar to the pH occurring within the fluid microclimate domain at the mucosal surface of...

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

authors： Hamra FK,Eber SL,Chin DT,Currie MG,Forte LR

更新日期：1997-03-18 00:00:00

abstract：:Antibodies to DNA in the left-handed (Z) conformation bind to acid-fixed polytene chromosomes of both Chironomus thummi and Drosophila melanogaster, as shown by direct and indirect immunofluorescence. Comparison of the phase-contrast, immunofluorescence, and DNA staining patterns shows a predominant localization of th...

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

authors： Arndt-Jovin DJ,Robert-Nicoud M,Zarling DA,Greider C,Weimer E,Jovin TM

更新日期：1983-07-01 00:00:00

abstract：:Preadipocytes can give rise to either white adipocytes or beige adipocytes. Owing to their distinct abilities in nutrient storage and energy expenditure, strategies that specifically promote "beiging" of adipocytes hold great promise for counterbalancing obesity and metabolic diseases. Yet, factors dictating the diffe...

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

authors： Liu K,Lin L,Li Q,Xue Y,Zheng F,Wang G,Zheng C,Du L,Hu M,Huang Y,Shao C,Kong X,Melino G,Shi Y,Wang Y

更新日期：2020-02-04 00:00:00

abstract：:Diabetic peripheral neuropathy (DPN) is the most common complication in both type 1 and type 2 diabetes. Here we studied some phenotypic features of a well-established animal model of type 2 diabetes, the leptin receptor-deficient db(-)/db(-) mouse, and also the effect of long-term (6 mo) treatment with coenzyme Q10 (...

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

authors： Shi TJ,Zhang MD,Zeberg H,Nilsson J,Grünler J,Liu SX,Xiang Q,Persson J,Fried KJ,Catrina SB,Watanabe M,Arhem P,Brismar K,Hökfelt TG

更新日期：2013-01-08 00:00:00