Proceedings of the National Academy of Sciences of the United States of America
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Nitric oxide synthase generates nitric oxide locally to regulate compartmentalized protein S-nitrosylation and protein trafficking
Nitric oxide (NO) is a highly diffusible and short-lived physiological messenger. Despite its diffusible nature, NO modifies thiol groups of specific cysteine residues in target proteins and alters protein function via S-nitrosylation. Although intracellular S-nitrosylation is a specific posttranslational modification, the defined localization of an NO source (nitric oxide synthase, NOS) with protein S-nitrosylation has never been directly demonstrated. Endothelial NOS (eNOS) is localized mainly on the Golgi apparatus and in plasma membrane caveolae. Here, we show by using eNOS targeted to either the Golgi or the nucleus that S-nitrosylation is concentrated at the primary site of eNOS localization. Furthermore, localization of eNOS on the Golgi enhances overall Golgi protein S-nitrosylation, the specific S-nitrosylation of
N
-ethylmaleimide-sensitive factor and reduces the speed of protein transport from the endoplasmic reticulum to the plasma membrane in a reversible manner. These data indicate that local NOS action generates organelle-specific protein S-nitrosylation reactions that can regulate intracellular transport processes.
Proceedings of the National Academy of Sciences of the United States of America - Tập 103 Số 52 - Trang 19777-19782 - 2006
HIV transcriptional activation by the accessory protein, VPR, is mediated by the p300 co-activator
The accessory protein, Vpr, is a virion-associated protein that is required for HIV-1 replication in macrophages and regulates viral gene expression in T cells. Vpr causes arrest of cell cycle progression at G
2
/M, presumably through its effect on cyclin B1⋅Cdc2 activity. Here, we show that the ability of Vpr to activate HIV transcription correlates with its ability to induce G
2
/M growth arrest, and this effect is mediated by the p300 transcriptional co-activator, which promotes cooperative interactions between the Rel A subunit of NF-κB and cyclin B1⋅Cdc2. Vpr cooperates with p300, which regulates NF-κB and the basal transcriptional machinery, to increase HIV gene expression. Similar effects are seen in the absence of Vpr with a kinase-deficient Cdc2, and overexpression of p300 increases levels of HIV Vpr
+
replication. Taken together, these data suggest that p300, through its interactions with NF-κB, basal transcriptional components, and Cdks, is modulated by Vpr and regulates HIV replication. The regulation of p300 by Vpr provides a mechanism to enhance viral replication in proliferating cells after growth arrest by increasing viral transcription.
Proceedings of the National Academy of Sciences of the United States of America - Tập 95 Số 9 - Trang 5281-5286 - 1998
DNA packaging and ejection forces in bacteriophageWe calculate the forces required to package (or, equivalently, acting to eject) DNA into (from) a bacteriophage capsid, as a function of the loaded (ejected) length, under conditions for which the DNA is either self-repelling or self-attracting. Through computer simulation and analytical theory, we find the loading force to increase more than 10-fold (to tens of piconewtons) during the final third of the loading process; correspondingly, the internal pressure drops 10-fold to a few atmospheres (matching the osmotic pressure in the cell) upon ejection of just a small fraction of the phage genome. We also determine an evolution of the arrangement of packaged DNA from toroidal to spool-like structures.
Proceedings of the National Academy of Sciences of the United States of America - Tập 98 Số 24 - Trang 13671-13674 - 2001
Global sea level linked to global temperatureWe propose a simple relationship linking global sea-level variations on time scales of decades to centuries to global mean temperature. This relationship is tested on synthetic data from a global climate model for the past millennium and the next century. When applied to observed data of sea level and temperature for 1880–2000, and taking into account known anthropogenic hydrologic contributions to sea level, the correlation is >0.99, explaining 98% of the variance. For future global temperature scenarios of the Intergovernmental Panel on Climate Change's Fourth Assessment Report, the relationship projects a sea-level rise ranging from 75 to 190 cm for the period 1990–2100.
Proceedings of the National Academy of Sciences of the United States of America - Tập 106 Số 51 - Trang 21527-21532 - 2009
Global patterns of 16S rRNA diversity at a depth of millions of sequences per sampleThe ongoing revolution in high-throughput sequencing continues to democratize the ability of small groups of investigators to map the microbial component of the biosphere. In particular, the coevolution of new sequencing platforms and new software tools allows data acquisition and analysis on an unprecedented scale. Here we report the next stage in this coevolutionary arms race, using the Illumina GAIIx platform to sequence a diverse array of 25 environmental samples and three known “mock communities” at a depth averaging 3.1 million reads per sample. We demonstrate excellent consistency in taxonomic recovery and recapture diversity patterns that were previously reported on the basis of metaanalysis of many studies from the literature (notably, the saline/nonsaline split in environmental samples and the split between host-associated and free-living communities). We also demonstrate that 2,000 Illumina single-end reads are sufficient to recapture the same relationships among samples that we observe with the full dataset. The results thus open up the possibility of conducting large-scale studies analyzing thousands of samples simultaneously to survey microbial communities at an unprecedented spatial and temporal resolution.
Proceedings of the National Academy of Sciences of the United States of America - - 2011
Emergent linguistic structure in artificial neural networks trained by self-supervisionThis paper explores the knowledge of linguistic structure learned by large artificial neural networks, trained via self-supervision, whereby the model simply tries to predict a masked word in a given context. Human language communication is via sequences of words, but language understanding requires constructing rich hierarchical structures that are never observed explicitly. The mechanisms for this have been a prime mystery of human language acquisition, while engineering work has mainly proceeded by supervised learning on treebanks of sentences hand labeled for this latent structure. However, we demonstrate that modern deep contextual language models learn major aspects of this structure, without any explicit supervision. We develop methods for identifying linguistic hierarchical structure emergent in artificial neural networks and demonstrate that components in these models focus on syntactic grammatical relationships and anaphoric coreference. Indeed, we show that a linear transformation of learned embeddings in these models captures parse tree distances to a surprising degree, allowing approximate reconstruction of the sentence tree structures normally assumed by linguists. These results help explain why these models have brought such large improvements across many language-understanding tasks.
Proceedings of the National Academy of Sciences of the United States of America - Tập 117 Số 48 - Trang 30046-30054 - 2020
Robustness, scalability, and integration of a wound-response gene expression signature in predicting breast cancer survivalBased on the hypothesis that features of the molecular program of normal wound healing might play an important role in cancer metastasis, we previously identified consistent features in the transcriptional response of normal fibroblasts to serum, and used this “wound-response signature” to reveal links between wound healing and cancer progression in a variety of common epithelial tumors. Here, in a consecutive series of 295 early breast cancer patients, we show that both overall survival and distant metastasis-free survival are markedly diminished in patients whose tumors expressed this wound-response signature compared to tumors that did not express this signature. A gene expression centroid of the wound-response signature provides a basis for prospectively assigning a prognostic score that can be scaled to suit different clinical purposes. The wound-response signature improves risk stratification independently of known clinico-pathologic risk factors and previously established prognostic signatures based on unsupervised hierarchical clustering (“molecular subtypes”) or supervised predictors of metastasis (“70-gene prognosis signature”).
Proceedings of the National Academy of Sciences of the United States of America - Tập 102 Số 10 - Trang 3738-3743 - 2005
Gender differences in age effect on brain atrophy measured by magnetic resonance imaging.A prospective sample of 69 healthy adults, age range 18-80 years, was studied with magnetic resonance imaging scans (T2 weighted, 5 mm thick) of the entire cranium. Volumes were obtained by a segmentation algorithm that uses proton density and T2 pixel values to correct field inhomogeneities ("shading"). Average (+/- SD) brain volume, excluding cerebellum, was 1090.91 ml (+/- 114.30; range, 822.19-1363.66), and cerebrospinal fluid (CSF) volume was 127.91 ml (+/- 57.62; range, 34.00-297.02). Brain volume was higher (by 5 ml) in the right hemisphere (P less than 0.0001). Men (n = 34) had 91 ml higher brain and 20 ml higher CSF volume than women (n = 35). Age was negatively correlated with brain volume [r(67) = -0.32, P less than 0.01] and positively correlated with CSF volume (r = 0.74, P less than 0.0001). The slope of the regression line with age for CSF was steeper for men than women (P = 0.03). This difference in slopes was significant for sulcal (P less than 0.0001), but not ventricular, CSF. The greatest amount of atrophy in elderly men was in the left hemisphere, whereas in women age effects were symmetric. The findings may point to neuroanatomic substrates of hemispheric specialization and gender differences in age-related changes in brain function. They suggest that women are less vulnerable to age-related changes in mental abilities, whereas men are particularly susceptible to aging effects on left hemispheric functions.
Proceedings of the National Academy of Sciences of the United States of America - Tập 88 Số 7 - Trang 2845-2849 - 1991
Solution structure of DFF40 and DFF45 N-terminal domain complex and mutual chaperone activity of DFF40 and DFF45Apoptotic DNA fragmentation is mediated by a
caspase-activated DNA fragmentation factor (DFF)40. Expression and
folding of DFF40 require the presence of DFF45, which also acts as a
nuclease inhibitor before DFF40 activation by execution caspases. The
N-terminal domains (NTDs) of both proteins are homologous, and their
interaction plays a key role in the proper functioning of this
two-component system. Here we report that the NTD of DFF45 alone is
unstructured in solution, and its folding is induced upon binding to
DFF40 NTD. Therefore, folding of both proteins regulates the formation
of the DFF40/DFF45 complex. The solution structure of the
heterodimeric complex between NTDs of DFF40 and DFF45 reported here
shows that the mutual chaperoning includes the formation of an
extensive network of intermolecular interactions that bury a
hydrophobic cluster inside the interface, surrounded by intermolecular
salt bridges.
Proceedings of the National Academy of Sciences of the United States of America - Tập 98 Số 11 - Trang 6051-6055 - 2001
Field- and clinically derived estimates of Wolbachia -mediated blocking of dengue virus transmission potential in Aedes aegypti mosquitoesSignificance
In laboratory experiments,
Wolbachia
(
w
Mel strain)-infected
Aedes aegypti
are refractory to disseminated arboviral infections. Yet previous characterizations of
w
Mel-mediated blocking have not considered several biologically and ecologically important factors likely to influence the virus–mosquito interaction. After direct feeding on 141 viremic dengue patients, we demonstrate
w
Mel lowers dengue virus (DENV) transmission potential and lengthens the extrinsic incubation period. Subsequently, using established field populations of wild-type and
w
Mel-infected
Ae. aegypti
, we compared field- versus laboratory-rearing conditions on mosquito susceptibility to disseminated DENV infection. The magnitude of
w
Mel-mediated virus blocking was even greater when mosquitoes developed under field conditions. These clinically and ecologically relevant findings support
Wolbachia
introgression into
Ae. aegypti
populations as a biocontrol method to reduce the transmission of DENV and other arboviruses.
Proceedings of the National Academy of Sciences of the United States of America - Tập 115 Số 2 - Trang 361-366 - 2018
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