RNase T is responsible for the end-turnover of tRNA in Escherichia coli.

abstract：:Studies in mice indicate that the gut microbiota promotes energy harvest and storage from components of the diet when these components are plentiful. Here we examine how the microbiota shapes host metabolic and physiologic adaptations to periods of nutrient deprivation. Germ-free (GF) mice and mice who had received a ...

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

authors： Crawford PA,Crowley JR,Sambandam N,Muegge BD,Costello EK,Hamady M,Knight R,Gordon JI

更新日期：2009-07-07 00:00:00

abstract：:Many neurodegenerative diseases are characterized by the accumulation of amyloid fibers in the brain, which can occur when a protein misfolds into an extended beta-sheet conformation. The nucleation of these beta-sheet aggregates is of particular interest, not only because it is the rate-determining step toward fiber ...

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

authors： Petty SA,Decatur SM

更新日期：2005-10-04 00:00:00

abstract：:Excitotoxicity, resulting from sustained activation of glutamate receptors of the N-methyl-d-aspartate (NMDA) subtype, is considered to play a causative role in the etiology of ischemic stroke and several neurodegenerative diseases. The NMDA receptor is therefore a target for the development of neuroprotective agents....

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

authors： Tai KK,Blondelle SE,Ostresh JM,Houghten RA,Montal M

更新日期：2001-03-13 00:00:00

abstract：:A census of the biomass on Earth is key for understanding the structure and dynamics of the biosphere. However, a global, quantitative view of how the biomass of different taxa compare with one another is still lacking. Here, we assemble the overall biomass composition of the biosphere, establishing a census of the ≈5...

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

authors： Bar-On YM,Phillips R,Milo R

更新日期：2018-06-19 00:00:00

abstract：:Lung cancer is the number one cause of cancer-related deaths in the world. Patients treated with current chemotherapies for non-small-cell lung cancers (NSCLCs) have a survival rate of approximately 15% after 5 years. Novel approaches are needed to treat this disease. We show elevated NAD(P)H:quinone oxidoreductase-1 ...

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

authors： Bey EA,Bentle MS,Reinicke KE,Dong Y,Yang CR,Girard L,Minna JD,Bornmann WG,Gao J,Boothman DA

更新日期：2007-07-10 00:00:00

abstract：:The human gut is home to trillions of microbes, thousands of bacterial phylotypes, as well as hydrogen-consuming methanogenic archaea. Studies in gnotobiotic mice indicate that Methanobrevibacter smithii, the dominant archaeon in the human gut ecosystem, affects the specificity and efficiency of bacterial digestion of...

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

authors： Samuel BS,Hansen EE,Manchester JK,Coutinho PM,Henrissat B,Fulton R,Latreille P,Kim K,Wilson RK,Gordon JI

更新日期：2007-06-19 00:00:00

abstract：:The hypothesis that intracellular Ca2+ is an essential component of the intracellular mechanism of insulin action in the adipocyte was evaluated. Cells were loaded with the Ca2+ chelator quin-2, by preincubating them with quin-2 AM, the tetrakis(acetoxymethyl) ester of quin-2. Quin-2 loading inhibited insulin-stimulat...

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

authors： Pershadsingh HA,Shade DL,Delfert DM,McDonald JM

更新日期：1987-02-01 00:00:00

abstract：:We determined the genomic sequence at the site of insertion in 2,266 unselected P element insertion events. Estimating physical properties of the genomic DNA at these insertion sites-such as base composition, bendability, A-philicity, protein-induced deformability, and B-DNA twist-revealed that they differ significant...

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

authors： Liao GC,Rehm EJ,Rubin GM

更新日期：2000-03-28 00:00:00

abstract：:The metal-binding motif in the sequence of leukotriene A4 (LTA4) (EC 3.3.2.6), a bifunctional zinc metalloenzyme, contains a glutamic acid that is conserved in several zinc hydrolases. To study its role for the two catalytic activities, Glu-296 in mouse leukotriene A4 hydrolase was replaced by a glutamine or alanine r...

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

authors： Wetterholm A,Medina JF,Rådmark O,Shapiro R,Haeggström JZ,Vallee BL,Samuelsson B

更新日期：1992-10-01 00:00:00

abstract：:Agrobacterium tumefaciens causes crown gall tumors on various plants by delivering transferred DNA (T-DNA) and virulence proteins into host plant cells. Under laboratory conditions, the bacterium is widely used as a vector to genetically modify a wide range of organisms, including plants, yeasts, fungi, and algae. Var...

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

authors： Yang Q,Li X,Tu H,Pan SQ

更新日期：2017-03-14 00:00:00

abstract：:Although neutrophils are known to be fundamental in controlling innate immune responses, their role in regulating adaptive immunity is just starting to be appreciated. We report that human neutrophils exposed to pregnancy hormones progesterone and estriol promote the establishment of maternal tolerance through the ind...

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

authors： Nadkarni S,Smith J,Sferruzzi-Perri AN,Ledwozyw A,Kishore M,Haas R,Mauro C,Williams DJ,Farsky SH,Marelli-Berg FM,Perretti M

更新日期：2016-12-27 00:00:00

abstract：:Functional lysosomes mediate autophagy and macropinocytosis for nutrient acquisition. Pancreatic ductal adenocarcinoma (PDAC) tumors exhibit high basal lysosomal activity, and inhibition of lysosome function suppresses PDAC cell proliferation and tumor growth. However, the codependencies induced by lysosomal inhibitio...

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

authors： Elliott IA,Dann AM,Xu S,Kim SS,Abt ER,Kim W,Poddar S,Moore A,Zhou L,Williams JL,Capri JR,Ghukasyan R,Matsumura C,Tucker DA,Armstrong WR,Cabebe AE,Wu N,Li L,Le TM,Radu CG,Donahue TR

更新日期：2019-04-02 00:00:00

abstract：:The type VI secretion system (T6SS) is a lethal weapon used by many bacteria to kill eukaryotic predators or prokaryotic competitors. Killing by the T6SS results from repetitive delivery of toxic effectors. Despite their importance in dictating bacterial fitness, systematic prediction of T6SS effectors remains challen...

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

authors： Liang X,Moore R,Wilton M,Wong MJ,Lam L,Dong TG

更新日期：2015-07-21 00:00:00

abstract：:Experimental systemic lupus erythematosus (SLE) can be induced in naive mice by immunization with a murine monoclonal anti-DNA antibody (mAb), 5G12, that bears a major idiotype designated 16/6 Id. Strain-dependent differences were observed in the proliferative responses of lymph node cells of mice immunized with two p...

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

authors： Waisman A,Ruiz PJ,Israeli E,Eilat E,Könen-Waisman S,Zinger H,Dayan M,Mozes E

更新日期：1997-04-29 00:00:00

abstract：:Although recent studies have shown that brown adipose tissue (BAT) arises from progenitor cells that also give rise to skeletal muscle, the developmental signals that control the formation of BAT remain largely unknown. Here, we show that brown preadipocytes possess primary cilia and can respond to Hedgehog (Hh) signa...

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

authors： Nosavanh L,Yu DH,Jaehnig EJ,Tong Q,Shen L,Chen MH

更新日期：2015-04-21 00:00:00

abstract：:It was previously shown that coexpression of the lactose permease of Escherichia coli in two contiguous fragments leads to functional complementation. We demonstrate here that site-directed thiol crosslinking of coexpressed permease fragments can be used to determine helix proximity in situ without the necessity of pu...

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

authors： Wu J,Kaback HR

更新日期：1996-12-10 00:00:00

abstract：:Viral membrane fusion proteins of class I are trimers in which the protomeric unit is a complex of a surface subunit (SU) and a fusion active transmembrane subunit (TM). Here we have studied how the protomeric units of Moloney murine leukemia virus envelope protein (Env) are activated in relation to each other, sequen...

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

authors： Sjöberg M,Löving R,Lindqvist B,Garoff H

更新日期：2017-03-07 00:00:00

abstract：:The human major histocompatibility complex encodes three classical class I antigens, HLA-A, -B, and -C. Of these HLA-A and -B act as strong transplantation antigens and as restriction molecules for recognition of foreign antigen by cytotoxic T lymphocytes. In contrast, little is known about HLA-C and it is not clear w...

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

authors： Dill O,Kievits F,Koch S,Ivanyi P,Hämmerling GJ

更新日期：1988-08-01 00:00:00

abstract：:Loss of ATP accompanying accumulation of dATP has recently been reported to occur in the erythrocytes and lymphoblasts of patients with T lymphocytic leukemia during treatment with deoxycoformycin, an inhibitor of adenosine deaminase (adenosine aminohydrolase, EC 3.5.4.4) that causes the accumulation of deoxyadenosine...

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

authors： Bagnara AS,Hershfield MS

更新日期：1982-04-01 00:00:00

abstract：:We report evidence for a developmental role of acetylcholine in axon pathfinding in the Drosophila visual system. Acetylcholine was detected on photoreceptor axons during their navigation to target sites in the brain, a time well before the formation of functional synapses. The pattern of photoreceptor axon projection...

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

authors： Yang H,Kunes S

更新日期：2004-10-19 00:00:00

abstract：:Accumulating evidence suggests cancer cells exhibit a dependency on metabolic pathways regulated by nicotinamide adenine dinucleotide (NAD+). Nevertheless, how the regulation of this metabolic cofactor interfaces with signal transduction networks remains poorly understood in glioblastoma. Here, we report nicotinamide ...

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

authors： Gujar AD,Le S,Mao DD,Dadey DY,Turski A,Sasaki Y,Aum D,Luo J,Dahiya S,Yuan L,Rich KM,Milbrandt J,Hallahan DE,Yano H,Tran DD,Kim AH

更新日期：2016-12-20 00:00:00

abstract：:Wnt signaling is required for the maintenance of intestinal stem cells and self-renewal of the intestinal epithelium. Intestinal cancers are frequently associated with mutations that activate the Wnt pathway. The role of Wnt signaling on differentiation of lineage-specific precursors in the intestine is not well chara...

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

authors： Wang Y,Giel-Moloney M,Rindi G,Leiter AB

更新日期：2007-07-03 00:00:00

abstract：:The strikingly high incidence of obstructed labor due to the disproportion of fetal size and the mother's pelvic dimensions has puzzled evolutionary scientists for decades. Here we propose that these high rates are a direct consequence of the distinct characteristics of human obstetric selection. Neonatal size relativ...

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

authors： Mitteroecker P,Huttegger SM,Fischer B,Pavlicev M

更新日期：2016-12-20 00:00:00

abstract：:Male mice were injected intraperitoneally with 125 microCi (1 Ci = 3.7 X 10(10) becquerels) of [3H]thymidine at 1-hr intervals and killed 1 hr after the second injection. Testes were prepared for bright-field and electron microscopic autoradiography. Primary spermatocytes, identified by light microscopy to be at the p...

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

authors： Grell RF,Oakberg EF,Generoso EE

更新日期：1980-11-01 00:00:00

abstract：:Cross-talk between the microtubule and actin networks has come under intense scrutiny following the realization that it is crucial for numerous essential processes, ranging from cytokinesis to cell migration. It is becoming increasingly clear that proteins long-considered highly specific for one or the other cytoskele...

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

authors： Oberhofer A,Reithmann E,Spieler P,Stepp WL,Zimmermann D,Schmid B,Frey E,Ökten Z

更新日期：2020-02-25 00:00:00

abstract：:Multiple independent mutations in neuroligin genes were identified in patients with familial autism, including the R451C substitution in neuroligin-3 (NL3). Previous studies showed that NL3(R451C) knock-in mice exhibited modestly impaired social behaviors, enhanced water maze learning abilities, and increased synaptic...

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

authors： Etherton M,Földy C,Sharma M,Tabuchi K,Liu X,Shamloo M,Malenka RC,Südhof TC

更新日期：2011-08-16 00:00:00

abstract：:In the central nervous system, glycogen-derived bioenergetic resources in astrocytes help promote tissue survival in response to focal neuronal stress. However, our understanding of the extent to which these resources are mobilized and utilized during neurodegeneration, especially in nearby regions that are not active...

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

authors： Cooper ML,Pasini S,Lambert WS,D'Alessandro KB,Yao V,Risner ML,Calkins DJ

更新日期：2020-08-04 00:00:00

abstract：:The chimaeric protein repressor-galactosidase, in which fully active lac repressor is covalently linked to the active enzyme beta-galactosidase, was used as a system for probing the quaternary structure of lac repressor. Electron micrographs revealed repressor-galactosidase to be a tetrameric aggregate. When lac repre...

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

authors： Kania J,Brown DT

更新日期：1976-10-01 00:00:00

abstract：:The Tap protein mediates the sequence nonspecific nuclear export of cellular mRNAs as well as the sequence-specific export of retroviral mRNAs bearing the constitutive transport element (CTE). Previously, the structures of individual Tap subdomains, including ribonucleoprotein and leucine-rich repeat domains, have bee...

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

authors： Ho DN,Coburn GA,Kang Y,Cullen BR,Georgiadis MM

更新日期：2002-02-19 00:00:00

abstract：:The coupling of calcium transport to ATP hydrolysis in rabbit muscle sarcoplasmic reticulum vesicles was determined under steady-state conditions in the presence of 5 mM oxalate and using various concentrations of vesicles to modulate the concentration of free Ca2+ in the medium. This experimental approach takes advan...

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

authors： Gafni A,Boyer PD

更新日期：1985-01-01 00:00:00