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418 Newest Publications in proceedings of the national academy of sciences current issue

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Classification of charge density waves based on their nature [Physics]

24-Feb-2015 | Xuetao Zhu; Yanwei Cao; Jiandi Zhang; E. W. Plummer; Jiandong Guo, Proceedings of the National Academy of Sciences current issue, 2015

The concept of a charge density wave (CDW) permeates much of condensed matter physics and chemistry. CDWs have their origin rooted in the instability of a one-dimensional system described by Peierls. The extension of this concept to reduced dimensional systems has led to the concept of Fermi ...

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Propagation of aggregated p53: Cross-reaction and coaggregation vs. seeding [Chemistry]

24-Feb-2015 | GuoZhen Wang; Alan R. Fersht, Proceedings of the National Academy of Sciences current issue, 2015

Destabilized mutant p53s coaggregate with WT p53, p63, and p73 in cancer cell lines. We found that stoichiometric amounts of aggregation-prone mutants induced only small amounts of WT p53 to coaggregate, and preformed aggregates did not significantly seed the aggregation of bulk protein. ...

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Elucidation of synaptonemal complex organization by super-resolution imaging with isotropic resolution [Chemistry]

17-Feb-2015 | Katharina Schücker; Thorge Holm; Christian Franke; Markus Sauer; Ricardo Benavente, Proceedings of the National Academy of Sciences current issue, 2015

Synaptonemal complexes (SCs) are meiosis-specific multiprotein complexes that are essential for synapsis, recombination, and segregation of homologous chromosomes, but the molecular organization of SCs remains unclear. We used immunofluorescence labeling in combination with super-resolution ...

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Quantum dot/antibody conjugates for in vivo cytometric imaging in mice [Chemistry]

03-Feb-2015 | Hee-Sun Han; Elisabeth Niemeyer; Yuhui Huang; Walid S. Kamoun; John D. Martin; Jayeeta Bhaumik; Yunching Chen; Sylvi ..., Proceedings of the National Academy of Sciences current issue, 2015

Multiplexed, phenotypic, intravital cytometric imaging requires novel fluorophore conjugates that have an appropriate size for long circulation and diffusion and show virtually no nonspecific binding to cells/serum while binding to cells of interest with high specificity. In addition, these ...

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Kinetics of protein-ligand unbinding: Predicting pathways, rates, and rate-limiting steps [Chemistry]

03-Feb-2015 | Pratyush Tiwary; Vittorio Limongelli; Matteo Salvalaglio; Michele Parrinello, Proceedings of the National Academy of Sciences current issue, 2015

The ability to predict the mechanisms and the associated rate constants of protein–ligand unbinding is of great practical importance in drug design. In this work we demonstrate how a recently introduced metadynamics-based approach allows exploration of the unbinding pathways, estimation of the ...

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X-ray crystallographic and EPR spectroscopic analysis of HydG, a maturase in [FeFe]-hydrogenase H-cluster assembly [Chemistry]

03-Feb-2015 | Pedro Dinis; Daniel L. M. Suess; Stephen J. Fox; Jenny E. Harmer; Rebecca C. Driesener; Liliana De La Paz; James R. ..., Proceedings of the National Academy of Sciences current issue, 2015

Hydrogenases use complex metal cofactors to catalyze the reversible formation of hydrogen. In [FeFe]-hydrogenases, the H-cluster cofactor includes a diiron subcluster containing azadithiolate, three CO, and two CN− ligands. During the assembly of the H cluster, the radical S-adenosyl methionine ...

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Multiaddressable molecular rectangles with reversible host-guest interactions: Modulation of pH-controlled guest release and capture [Chemistry]

20-Jan-2015 | Alan Kwun-Wa Chan; Wai Han Lam; Yuya Tanaka; Keith Man-Chung Wong; Vivian Wing-Wah Yam, Proceedings of the National Academy of Sciences current issue, 2015

A series of multiaddressable platinum(II) molecular rectangles with different rigidities and cavity sizes has been synthesized by endcapping the U-shaped diplatinum(II) terpyridine moiety with various bis-alkynyl ligands. The studies of the host–guest association with various square planar ...

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High-energy chemistry of formamide: A unified mechanism of nucleobase formation [Chemistry]

20-Jan-2015 | Martin Ferus; David Nesvorný; Jiří Šponer; Petr Kubelík; Regina Michalčíková; Violetta Shestivská; Judit E. Šponer; ..., Proceedings of the National Academy of Sciences current issue, 2015

The coincidence of the Late Heavy Bombardment (LHB) period and the emergence of terrestrial life about 4 billion years ago suggest that extraterrestrial impacts could contribute to the synthesis of the building blocks of the first life-giving molecules. We simulated the high-energy synthesis of ...

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Correction for Ferus et al., High-energy chemistry of formamide: A unified mechanism of nucleobase formation [Correction]

20-Jan-2015 | Proceedings of the National Academy of Sciences current issue, 2015

CHEMISTRY Correction for “High-energy chemistry of formamide: A unified mechanism of nucleobase formation,” by Martin Ferus, David Nesvorný, Jiří Šponer, Petr Kubelík, Regina Michalčíková, Violetta Shestivská, Judit E. Šponer, and Svatopluk Civiš which appeared in issue 3, January 20, 2015, of ...

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Imaging local electric fields produced upon synchrotron X-ray exposure [Chemistry]

20-Jan-2015 | Christopher M. Dettmar; Justin A. Newman; Scott J. Toth; Michael Becker; Robert F. Fischetti; Garth J. Simpson, Proceedings of the National Academy of Sciences current issue, 2015

Electron–hole separation following hard X-ray absorption during diffraction analysis of soft materials under cryogenic conditions produces substantial local electric fields visualizable by second harmonic generation (SHG) microscopy. Monte Carlo simulations of X-ray photoelectron trajectories ...

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