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1,663 Newest Publications in proceedings of the national academy of sciences current issue

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Conserved regulatory mechanism controls the development of cells with rooting functions in land plants [Plant Biology]

21-Jul-2015 | Thomas Ho Yuen Tam; Bruno Catarino; Liam Dolan, Proceedings of the National Academy of Sciences current issue, 2015

Land plants develop filamentous cells—root hairs, rhizoids, and caulonemata—at the interface with the soil. Members of the group XI basic helix–loop–helix (bHLH) transcription factors encoded by LOTUS JAPONICUS ROOTHAIRLESS1-LIKE (LRL) genes positively regulate the development of root hairs in ...

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Measuring selective constraint on fertility in human life histories [Population Biology]

21-Jul-2015 | James Holland Jones; Shripad Tuljapurkar, Proceedings of the National Academy of Sciences current issue, 2015

Human life histories combine late age at first reproduction, long reproductive span, relatively high fertility, and substantial postreproductive survival. However, even among the most fecund populations, human fertility falls far below its theoretical maximum. The extent of parental care required ...

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Suppression of conformational heterogeneity at a protein-protein interface [Biophysics and Computational Biology]

21-Jul-2015 | Lindsay N. Deis; Qinglin Wu; You Wang; Yang Qi; Kyle G. Daniels; Pei Zhou; Terrence G. Oas, Proceedings of the National Academy of Sciences current issue, 2015

Staphylococcal protein A (SpA) is an important virulence factor from Staphylococcus aureus responsible for the bacterium’s evasion of the host immune system. SpA includes five small three-helix–bundle domains that can each bind with high affinity to many host proteins such as antibodies. The ...

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Trp triad-dependent rapid photoreduction is not required for the function of Arabidopsis CRY1 [Plant Biology]

21-Jul-2015 | Jie Gao; Xu Wang; Meng Zhang; Mingdi Bian; Weixian Deng; Zecheng Zuo; Zhenming Yang; Dongping Zhong; Chentao Lin, Proceedings of the National Academy of Sciences current issue, 2015

Cryptochromes in different evolutionary lineages act as either photoreceptors or light-independent transcription repressors. The flavin cofactor of both types of cryptochromes can be photoreduced in vitro by electron transportation via three evolutionarily conserved tryptophan residues known as ...

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Biased Brownian motion as a mechanism to facilitate nanometer-scale exploration of the microtubule plus end by a kinesin-8 [Biophysics and Computational Biology]

21-Jul-2015 | Yongdae Shin; Yaqing Du; Scott E. Collier; Melanie D. Ohi; Matthew J. Lang; Ryoma Ohi, Proceedings of the National Academy of Sciences current issue, 2015

Kinesin-8s are plus-end–directed motors that negatively regulate microtubule (MT) length. Well-characterized members of this subfamily (Kip3, Kif18A) exhibit two important properties: (i) They are “ultraprocessive,” a feature enabled by a second MT-binding site that tethers the motors to a MT ...

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The EBF transcription factor Collier directly promotes Drosophila blood cell progenitor maintenance independently of the niche [Developmental Biology]

21-Jul-2015 | Billel Benmimoun; Cédric Polesello; Marc Haenlin; Lucas Waltzer, Proceedings of the National Academy of Sciences current issue, 2015

The maintenance of stem or progenitor cell fate relies on intrinsic factors as well as local cues from the cellular microenvironment and systemic signaling. In the lymph gland, an hematopoietic organ in Drosophila larva, a group of cells called the Posterior Signaling Centre (PSC), whose ...

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Cardiac myosin binding protein C regulates postnatal myocyte cytokinesis [Developmental Biology]

21-Jul-2015 | Jianming Jiang; Patrick G. Burgon; Hiroko Wakimoto; Kenji Onoue; Joshua M. Gorham; Caitlin C. O’Meara; Gregory Fomov ..., Proceedings of the National Academy of Sciences current issue, 2015

Homozygous cardiac myosin binding protein C-deficient (Mybpct/t) mice develop dramatic cardiac dilation shortly after birth; heart size increases almost twofold. We have investigated the mechanism of cardiac enlargement in these hearts. Throughout embryogenesis myocytes undergo cell division ...

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Structure of a herpesvirus nuclear egress complex subunit reveals an interaction groove that is essential for viral replication [Biophysics and Computational Biology]

21-Jul-2015 | Kendra E. Leigh; Mayuri Sharma; My Sam Mansueto; Andras Boeszoermenyi; David J. Filman; James M. Hogle; Gerhard Wagn ..., Proceedings of the National Academy of Sciences current issue, 2015

Herpesviruses require a nuclear egress complex (NEC) for efficient transit of nucleocapsids from the nucleus to the cytoplasm. The NEC orchestrates multiple steps during herpesvirus nuclear egress, including disruption of nuclear lamina and particle budding through the inner nuclear membrane. In ...

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Intrinsic unfoldase/foldase activity of the chaperonin GroEL directly demonstrated using multinuclear relaxation-based NMR [Biophysics and Computational Biology]

21-Jul-2015 | David S. Libich; Vitali Tugarinov; G. Marius Clore, Proceedings of the National Academy of Sciences current issue, 2015

The prototypical chaperonin GroEL assists protein folding through an ATP-dependent encapsulation mechanism. The details of how GroEL folds proteins remain elusive, particularly because encapsulation is not an absolute requirement for successful re/folding. Here we make use of a metastable model ...

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Jagged mediates differences in normal and tumor angiogenesis by affecting tip-stalk fate decision [Biophysics and Computational Biology]

21-Jul-2015 | Marcelo Boareto; Mohit Kumar Jolly; Eshel Ben-Jacob; José N. Onuchic, Proceedings of the National Academy of Sciences current issue, 2015

Angiogenesis is critical during development, wound repair, and cancer progression. During angiogenesis, some endothelial cells adopt a tip phenotype to lead the formation of new branching vessels; the trailing stalk cells proliferate to develop the vessel. Notch and VEGF signaling mediate the ...

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