keyword
MENU ▼
Read by QxMD icon Read
search

Single molecule localization

keyword
https://www.readbyqxmd.com/read/28338873/molecular-dissection-of-the-actin-binding-ability-of-the-fission-yeast-%C3%AE-actinin-ain1-in-vitro-and-in-vivo
#1
Rikuri Morita, Masak Takaine, Osamu Numata, Kentaro Nakano
A contractile ring (CR) is involved in cytokinesis in animal and yeast cells. Although several types of actin-bundling proteins associate with F-actin in the CR, their individual roles in the CR have not yet been elucidated in detail. Ain1 is the sole α-actinin homologue in the fission yeast Schizosaccharomyces pombe and specifically localizes to the CR with a high turnover rate. S. pombe cells lacking the ain1+ gene show defects in cytokinesis under stress conditions. We herein investigated the biochemical activity and cellular localization mechanisms of Ain1...
February 28, 2017: Journal of Biochemistry
https://www.readbyqxmd.com/read/28332047/mechanisms-of-resistance-to-target-therapies-in-non-small-cell-lung-cancer
#2
Francesco Facchinetti, Claudia Proto, Roberta Minari, Marina Garassino, Marcello Tiseo
Targeted therapies are revolutionizing the treatment of advanced non-small cell lung cancer (NSCLC). The discovery of key oncogenic events mainly in lung adenocarcinoma, like EGFR mutations or ALK rearrangements, has changed the treatment landscape while improving the prognosis of lung cancer patients. Inevitably, virtually all patients initially treated with targeted therapies develop resistance because of the emergence of an insensitive cellular population, selected by pharmacologic pressure. Diverse mechanisms of resistance, in particular to EGFR, ALK and ROS1 tyrosine-kinase inhibitors (TKIs), have now been discovered and may be classified in three different groups: (1) alterations in the target (such as EGFR T790M and ALK or ROS1 mutations); (2) activation of alternative pathways (i...
March 23, 2017: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/28328539/polarization-sensitive-localization-based-super-resolution-microscopy-with-a-birefringent-wedge
#3
József Sinkó, Tamás Gajdos, Elvira Czvik, Gábor Szabó, Miklós Erdélyi
A practical method has been presented for polarization sensitive localization based super-resolution microscopy using a birefringent dual wedge. The measurement of the polarization degree at the single molecule level can reveal the chemical and physical properties of the local environment of the fluorescent dye molecule and can hence provide information about the sub-diffraction sized structure of biological samples. Polarization sensitive STORM imaging of the F-Actins proved correlation between the orientation of fluorescent dipoles and the axis of the fibril...
March 22, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28324608/two-color-total-internal-reflection-fluorescence-microscopy-of-exocytosis-in-endocrine-cells
#4
Adam J Trexler, Justin W Taraska
We describe a comprehensive method for imaging and analysis of local protein dynamics at single sites of exocytosis in living cultured endocrine cells. This method is well suited to quantitatively map the complex dynamics of individual molecules at single sites of vesicle fusion in live cells.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28324606/sample-preparation-and-choice-of-fluorophores-for-single-and-dual-color-photo-activated-localization-microscopy-palm-with-bacterial-cells
#5
Juri N Bach, Giacomo Giacomelli, Marc Bramkamp
Photo-activated localization microscopy (PALM) is one of the light microscopy techniques providing highest resolution. Single photo-activatable or photo-switchable fluorescent molecules are stochastically excited. The point spread function of this event is recorded and the exact fluorophore position is calculated. This chapter describes how bacterial samples can be prepared for PALM to achieve routinely a resolution of ≤30 nm using fluorophores such as mNeonGreen, Dendra2, and PAmCherry. It is also explained how to perform multicolor PALM and combine it with total internal reflection (TIRF) microscopy to increase resolution...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28323251/plasmon-emitter-interaction-using-integrated-ring-grating-nanoantenna-structures
#6
Nancy Rahbany, Wei Geng, Renaud Bachelot, Christophe Couteau
Overcoming the diffraction limit to achieve high optical resolution is one of the main challenges in the fields of plasmonics, nanooptics and nanophotonics. In this work, we introduce novel plasmonic structures consisting of nanoantennas (nanoprisms, single bowtie nanoantennas and double bowtie nanoantennas) integrated in the center of ring diffraction gratings. Propagating surface plasmon polaritons (SPPs) are generated by the ring grating and coupled with localized surface plasmons (LSPs) at the nanoantennas exciting emitters placed in their gap...
March 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28320972/sensing-relative-signal-in-the-tgf-%C3%AE-smad-pathway
#7
Christopher L Frick, Clare Yarka, Harry Nunns, Lea Goentoro
How signaling pathways function reliably despite cellular variation remains a question in many systems. In the transforming growth factor-β (Tgf-β) pathway, exposure to ligand stimulates nuclear localization of Smad proteins, which then regulate target gene expression. Examining Smad3 dynamics in live reporter cells, we found evidence for fold-change detection. Although the level of nuclear Smad3 varied across cells, the fold change in the level of nuclear Smad3 was a more precise outcome of ligand stimulation...
March 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28317958/the-collective-behavior-of-spring-like-motifs-tethered-to-a-dna-origami-nanostructure
#8
E-C Schöneweiß, B Saccà
Dynamic DNA nanotechnology relies on the integration of small switchable motifs at suitable positions of DNA nanostructures, thus enabling the manipulation of matter with nanometer spatial accuracy in a trigger-dependent fashion. Typical examples of such motifs are hairpins, whose elongation into duplexes can be used to perform long-range, translational movements. In this work, we used temperature-dependent FRET spectroscopy to determine the thermal stabilities of distinct sets of hairpins integrated into the central seam of a DNA origami structure...
March 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28314790/selinexor-kpt-330-induces-tumor-suppression-through-nuclear-sequestration-of-ikappab-and-down-regulation-of-survivin
#9
Jayasree S Nair, Elgilda Musi, Gary K Schwartz
PURPOSE: Selinexor, a small molecule that inhibits nuclear export protein XPO1 has demonstrated efficacy in solid tumors and hematologic malignancies with the evidence of clinical activity in sarcoma as a single agent. Treatment options available are very few and hence the need to identify novel targets and strategic therapies is of utmost importance. EXPERIMENTAL DESIGN: The mechanistic effects of selinexor in sarcomas as a monotherapy and in combination with proteasome inhibitor, carfilzomib, across a panel of cell lines in vitro and few in xenograft mouse models were investigated...
March 17, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28304078/moving-messages-in-the-developing-brain-emerging-roles-for-mrna-transport-and-local-translation-in-neural-stem-cells
#10
REVIEW
Louis-Jan Pilaz, Debra L Silver
The mammalian cerebral cortex is a complex brain structure integral to our higher cognition. During embryonic cortical development, radial glial progenitors (RGCs) produce neurons and serve as physical structures for migrating neurons. Recent discoveries highlight new roles for RNA localization and local translation in RGCs, both at the cell body and at distal structures called basal endfeet. By implementing technologies from the field of RNA research to brain development, investigators can manipulate RNA binding proteins as well as visualize single molecule RNAs, live movement of mRNAs and their binding proteins, and translation...
March 17, 2017: FEBS Letters
https://www.readbyqxmd.com/read/28303166/single-molecule-studies-of-high-mobility-group-b-architectural-dna-bending-proteins
#11
REVIEW
Divakaran Murugesapillai, Micah J McCauley, L James Maher, Mark C Williams
Protein-DNA interactions can be characterized and quantified using single molecule methods such as optical tweezers, magnetic tweezers, atomic force microscopy, and fluorescence imaging. In this review, we discuss studies that characterize the binding of high-mobility group B (HMGB) architectural proteins to single DNA molecules. We show how these studies are able to extract quantitative information regarding equilibrium binding as well as non-equilibrium binding kinetics. HMGB proteins play critical but poorly understood roles in cellular function...
February 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28302763/phase-2-study-of-99m-tc-trofolastat-spect-ct-to-identify-and-localize-prostate-cancer-in-intermediate-and-high-risk-patients-undergoing-radical-prostatectomy-and-extended-pelvic-lymph-node-dissection
#12
Karolien E Goffin, Steven Joniau, Peter Tenke, Kevin Slawin, Eric A Klein, Nancy Stambler, Thomas Strack, John Babich, Thomas Armor, Vivien Wong
Rationale:(99m)Tc-trofolastat ((99m)Tc-MIP-1404), a small-molecule inhibitor of prostate-specific membrane antigen (PSMA), shows high potential to detect prostate cancer (PCa) non-invasively using single-photon-emission-computed-tomography (SPECT). We therefore wanted to assess the performance of (99m)Tc-trofolastat SPECT/CT in a phase 2 multi-center, multi-reader prospective study in patients with intermediate- and high-grade PCa, prior to radical prostatectomy and extended pelvic lymph node dissection, with histopathology as gold standard...
March 16, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28297980/role-of-structure-in-the-%C3%AE-and-%C3%AE-dynamics-of-a-simple-glass-forming-liquid
#13
D Fragiadakis, C M Roland
The elusive connection between dynamics and local structure in supercooled liquids is an important piece of the puzzle in the unsolved problem of the glass transition. The Johari-Goldstein β relaxation, ubiquitous in glass-forming liquids, exhibits mean properties that are strongly correlated to the long-time α dynamics. However, the former comprises simpler, more localized motion, and thus has perhaps a more straightforward connection to structure. Molecular dynamics simulations were carried out on a two-dimensional, rigid diatomic molecule (the simplest structure exhibiting a distinct β process) to assess the role of the local liquid structure on both the Johari-Goldstein β and the α relaxation...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28291761/proper-modelling-of-ligand-binding-requires-an-ensemble-of-bound-and-unbound-states
#14
Nicholas M Pearce, Tobias Krojer, Frank von Delft
Although noncovalent binding by small molecules cannot be assumed a priori to be stoichiometric in the crystal lattice, occupancy refinement of ligands is often avoided by convention. Occupancies tend to be set to unity, requiring the occupancy error to be modelled by the B factors, and residual weak density around the ligand is necessarily attributed to `disorder'. Where occupancy refinement is performed, the complementary, superposed unbound state is rarely modelled. Here, it is shown that superior accuracy is achieved by modelling the ligand as partially occupied and superposed on a ligand-free `ground-state' model...
March 1, 2017: Acta Crystallographica. Section D, Structural Biology
https://www.readbyqxmd.com/read/28290531/mapping-cell-surface-adhesion-by-rotation-tracking-and-adhesion-footprinting
#15
Isaac T S Li, Taekjip Ha, Yann R Chemla
Rolling adhesion, in which cells passively roll along surfaces under shear flow, is a critical process involved in inflammatory responses and cancer metastasis. Surface adhesion properties regulated by adhesion receptors and membrane tethers are critical in understanding cell rolling behavior. Locally, adhesion molecules are distributed at the tips of membrane tethers. However, how functional adhesion properties are globally distributed on the individual cell's surface is unknown. Here, we developed a label-free technique to determine the spatial distribution of adhesive properties on rolling cell surfaces...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28287710/single-molecule-localization-microscopy-in-eukaryotes
#16
Markus Sauer, Mike Heilemann
Super-resolution fluorescence imaging by photoactivation or photoswitching of single fluorophores and position determination (single-molecule localization microscopy, SMLM) provides microscopic images with subdiffraction spatial resolution. This technology has enabled new insights into how proteins are organized in a cellular context, with a spatial resolution approaching virtually the molecular level. A unique strength of SMLM is that it delivers molecule-resolved information, along with super-resolved images of cellular structures...
March 13, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28287526/structural-information-from-single-molecule-fret-experiments-using-the-fast-nano-positioning-system
#17
Thilo Dörfler, Tobias Eilert, Carlheinz Röcker, Julia Nagy, Jens Michaelis
Single-molecule Förster Resonance Energy Transfer (smFRET) can be used to obtain structural information on biomolecular complexes in real-time. Thereby, multiple smFRET measurements are used to localize an unknown dye position inside a protein complex by means of trilateration. In order to obtain quantitative information, the Nano-Positioning System (NPS) uses probabilistic data analysis to combine structural information from X-ray crystallography with single-molecule fluorescence data to calculate not only the most probable position but the complete three-dimensional probability distribution, termed posterior, which indicates the experimental uncertainty...
February 9, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28287133/activated-full-length-myosin-x-moves-processively-on-filopodia-with-large-steps-toward-diverse-two-dimensional-directions
#18
Osamu Sato, Hyun Suk Jung, Satoshi Komatsu, Yoshikazu Tsukasaki, Tomonobu M Watanabe, Kazuaki Homma, Mitsuo Ikebe
Myosin-X, (Myo 10), is an unconventional myosin that transports the specific cargos to filopodial tips, and is associated with the mechanism underlying filopodia formation and extension. To clarify the innate motor characteristic, we studied the single molecule movement of a full-length myosin-X construct with leucine zipper at the C-terminal end of the tail (M10(Full)LZ) and the tail-truncated myosin-X without artificial dimerization motif (BAP-M10(1-979)HMM). M10(Full)LZ localizes at the tip of filopodia like myosin-X full-length (M10(Full))...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28282100/controlling-electronic-access-to-the-spin-excitations-of-a-single-molecule-in-a-tunnel-junction
#19
Ben Warner, Fadi El Hallak, Henning Prüser, Afolabi Ajibade, Tobias G Gill, Andrew J Fisher, Mats Persson, Cyrus F Hirjibehedin
Spintronic phenomena underpin new device paradigms for data storage and sensing. Scaling these down to the single molecule level requires controlling the properties of current-carrying molecular orbitals to enable access to spin states through phenomena such as inelastic electron tunnelling. Here we show that the spintronic properties of a tunnel junction containing a single molecule can be controlled using the local environment as a pseudo-gate. For tunnelling through iron phthalocyanine (FePc) on an insulating copper nitride (Cu2N) monolayer above Cu(001), we find that spin transitions may be strongly excited depending on the binding site of the central Fe atom...
March 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28279921/computational-smart-polymer-design-based-on-elastin-protein-mutability
#20
Anna Tarakanova, Wenwen Huang, Anthony S Weiss, David L Kaplan, Markus J Buehler
Soluble elastin-like peptides (ELPs) can be engineered into a range of physical forms, from hydrogels and scaffolds to fibers and artificial tissues, finding numerous applications in medicine and engineering as "smart polymers". Elastin-like peptides are attractive candidates as a platform for novel biomaterial design because they exhibit a highly tunable response spectrum, with reversible phase transition capabilities. Here, we report the design of the first virtual library of elastin-like protein models using methods for enhanced sampling to study the effect of peptide chemistry, chain length, and salt concentration on the structural transitions of ELPs, exposing associated molecular mechanisms...
May 2017: Biomaterials
keyword
keyword
87447
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"