hydrogen deuterium exchange coupled to mass spectrometry h dx ms
Tài liệu Báo cáo khoa học: Accessibility changes within diphtheria toxin T domain when in the functional molten globule state, as determined using hydrogen⁄deuterium exchange measurements pdf
... protected against H ⁄ D exchange, highlighting the regions of the protein with either higher stability and ⁄ or lower accessibility to the solvent The regions exhibiting the lowest exchange (below ... consequence, the dependence of Log(kexch) (the logarithm of the exchange rate) as a function of the pH is a chevron plot with a minimum of around pH for oligopeptides Between pH and pH 7, the H ⁄ D exchange ... H ⁄ D exchange during the experiments with the various states of the T domain Because the intrinsic rates of H ⁄ D exchange are highly sensitive to pH, it is necessary to take into account the...
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TECHNIQUES FOR THE ANALYSIS OF ORGANIC CHEMECALS BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (ICP-MS) pptx
... flammable or explosive gases in the laboratory The oxygen is added either in the spray chamber or using a T-connector before the torch When oxygen is added to the plasma, the plasma environment becomes ... based ICP -MS instruments cannot, however, match the detection capability of the ShieldTorch System in high purity matrices This application note deals only with the use of cool plasmas for the analysis ... Table For quadrupole ICP -MS (ICP-QMS) the established and most effective method of reducing polyatomic interferences in high purity matrices is the use of the ShieldTorch System and cool plasma...
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Báo cáo khoa học: Quenched hydrogen ⁄deuterium exchange NMR characterization of amyloid-b peptide aggregates formed in the presence of Cu2+ or Zn2+ ppt
... converted to monomers through the addition of a chelating agent, suggesting that their mode of assembly is different from that of the fibrillar forms Quenched H ⁄ D exchange NMR on Ab assemblies The ... of quenched H ⁄ D exchange in combination with NMR spectroscopy is a highly useful technique with which to efficiently pinpoint the solvent accessibility of individual amide protons within peptide ... strengthen the hydrophobic interactions within the core of the fibrillar fold via a shift in the protofilament assembly that positions the C-terminal residues of Ab(1–42) in a more hydrophobic environment...
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Giới thiệu về phổ khối Introduction to mass spectrometry
... The main purpose of the ion reflector is to lengthen the ion flight path (to improve mass resolution), without making the instrument physically larger Physically, the ion reflector looks much ... pressure higher than the pressure required by the mass spec analyzer In this case, a "vacuum interface" stage is required to transfer the ions from the relatively high pressure of the source, to the ... to which they were initially accelerated by the pulse The lighter (and/or more highly charged) ions are traveling faster, and "pull ahead" of the heavier ions which are moving more slowly (This...
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Báo cáo y học: "Evaluating the potential of a novel oral lesion exudate collection method coupled with mass spectrometry-based proteomics for oral cancer biomarker discovery" docx
... from the three brush biopsy samples were then compared to the proteins identified from the three exudate samples (Figure 3) The results show that these two sample types are highly similar, with 96% ... (exudates, brush biopsy and whole saliva) were analyzed using online capillary liquid chromatography coupled with tandem mass spectrometry (MS/ MS) using an LTQ-Orbitrap XL mass spectrometer (Thermo Scientific, ... similar inflammatory epithelial lesions [17-19], there are numerous proteins which we would expect to show increased abundance within these inflammatory lesions compared to healthy tissues We analyzed...
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Water quality application of inductively coupled plasma mass spectrometry (ICP MS) part 2 determination of 62 elements
... determine the correction factors for the corresponding equations High demands are made concerning the purity of the basic reagents due to the high mass concentrations The user should ensure that the ... normally carried out through ISO technical committees Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International ... g/ml 6.4 Hydrochloric acid, c(HCl) = 0,2 mol/l 6.5 Sulfuric acid, ρ (H2 SO4) = 1,84 g/ml 6.6 Hydrogen peroxide, w (H2 O2) = 30 % NOTE Note that hydrogen peroxide is often stabilized with phosphoric...
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facilitation of protein three-dimensional structure determination using enhanced peptide amide deuterium exchange mass spectrometry (dxms)
... chains (–OH, -SH, NH2, COOH) that exchange too rapidly to be measurable by isotope exchange methods Protons bound directly to carbon have high covalent character such that hydrogen exchange is ... 16 Thus, the propensity of hydrogen to exchange provides information on the conformational properties of a folded protein 1.5 AMIDE HYDROGEN/ DEUTERIUM EXCHANGE STUDIES Isotopic exchange of hydrogen ... Linderstrom-Lang K Exchange of hydrogen atoms in insulin with deuterium atoms in aqueous solutions Biochim Biophys Acta 1954;14:574-575 18 Linderstrom-Lang K The pH-dependence of the deuterium exchange of...
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Insights into protein kinase a activation using cAMP analogs and amide h 2h exchange mass spectrometry
... the three kinds of hydrogens in proteins, hydrogens covalently bound to carbon atoms, side chain hydrogens and backbone amide hydrogens, only the backbone amide hydrogens exchange at a rate that ... exchanging with the hydrogen atoms of the surrounding solvent molecules If deuterium oxide is used as a solvent then the isotope of hydrogen, deuterium gets incorporated into the protein and as deuterium ... Exchange Amide hydrogen/ deuterium exchange followed by mass spectrometry is a method used to analyze the structure and dynamics of proteins Some hydrogen atoms in proteins are capable of exchanging...
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Báo cáo khoa học: Determination of thioxylo-oligosaccharide binding to family 11 xylanases using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and X-ray crystallography pot
... 2-O B3 3-O Glu178 OE2 HOH440 HOH438 HOH441 Tyr78 OH Tyr172 OH Tyr172 OH HOH1 HOH450 HOH357 HOH450 Glu178 OE1 HOH192 HOH436 Tyr78 OH Tyr172 OH Tyr172 OH HOH6 HOH145 HOH372 3.08 2.60 2.55 2.52 ... Protein main chain atoms Protein side chain atoms All protein atoms Inhibitor atoms Water atoms Other atoms All atoms PDB code Methyl 4,4II,4III,4IVtetrathio-a-D-xylopentaoside P21212 a ẳ 108.24, ... with S-Xyl5-Me The observed part of the inhibitor (three xylopyranose rings) is shown at the active site Carbon atoms of the inhibitor are coloured in purple, oxygen atoms in red, and sulfur atoms...
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Báo cáo khoa học: A region within the C-terminal domain of Ure2p is shown to interact with the molecular chaperone Ssa1p by the use of cross-linkers and mass spectrometry doc
... until MS analysis High mass MALDI-TOF MS High -mass MALDI-TOF mass spectra of the intact protein complexes were obtained using a MALDI-TOF mass spectrometer (Voyager DE STR; Applied Biosystems, ... involved in the interaction with Ssa1p is shown in (D) Lysine 339 is shown in orange; the region of Ure2p whereby exposure to the solvent was shown to change upon assembly into fibrils by HXMS [33] ... Ure2p into fibrils [33] Thus, the binding of Ssa1p in the vicinity of this stretch interferes with Ure2p assembly into fibrils either because of a change in the conformation of this stretch or the crowding...
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Báo cáo Y học: A new conceptual framework for enzyme catalysis Hydrogen tunneling coupled to enzyme dynamics in flavoprotein and quinoprotein enzymes docx
... dehydrogenase (AADH), and also the flavoenzymes trimethylamine dehydrogenase (TMADH) and heterotetrameric sarcosine 3098 M J Sutcliffe and N S Scrutton (Eur J Biochem 269) dehydrogenase (TSOX) High ... solvent, and these were suggested to indicate tunneling Note, however, that the effect of D2O on the reaction dynamics is potentially complicated owing to the exchange of protons throughout the protein ... First, the structure of the iminoquinone was produced by adding methylamine to the TTQ in the crystal structure of Methylophilus methylotrophus MADH (Fig 2B) The partial charges of the iminoquinone...
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Báo cáo Y học: Environmentally coupled hydrogen tunneling Linking catalysis to dynamics potx
... quanta than the C -H stretch (% 2200 cm)1 vs 3000 cm)1) The factors that contribute to the Franck–Condon overlap are the frequency of the reacting bond (xH or xD), the mass (mH or mD) of the transferred ... environmentally coupled hydrogen tunneling In both the thermophilic ADH from Bacillus stearothermophilus (ht-ADH) and soybean lipoxygenase (SLO), VT-KIEs revealed inflated Arrhenius prefactor ratios (AH/AD ... in many other hydrogen atom transfer reactions Many H transfer reactions are characterized by very large inherent chemical barriers, such that movement through, rather than over, the barrier...
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Báo cáo hóa học: " Mass spectrometry based on a coupled Cooperpair box and nanomechanical resonator system" pdf
... Josephson coupling of the CPB qubit The Hamiltonian of our coupled CPB-NR system reads: H = HCPB + HNR + Hint , HCPB = 1 π Φx (t) σx , h q σz − EJ0 cos ¯ 2 Φ0 (1) (2) HNR = h n a† a, ¯ (3) Hint ... through the CPB system without the influence of the NR (coupling off) in the absence of the control field (control off), which shows the standard resonance absorption profile However, when the ... the NR is much narrower than the peak in the center, since the damping rate of the NR is much smaller than the decay rate of the CPB qubit Therefore, such a coupled CPB-NR system is proposed here...
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báo cáo khoa học: "Applying mass spectrometry based proteomic technology to advance the understanding of multiple myeloma" ppt
... further insight into the signaling pathways in which these proteins are acting Arsenic trioxide Arsenic trioxide (ATO) has been shown to induce growth inhibition and apoptosis in MM cells and has ... and proteins showed strong complementarity in terms of the functional and biological systems with which they are associated, suggesting the systems affected by them or those which they affect may ... through the tube Ions of less mass will reach the detector faster than those that are heavier (C) Detector As an ion strikes the surface of the electron multiplier detector, it causes the emission...
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Báo cáo y học: "Quality evaluation of mycelial Antrodia camphorata using high-performance liquid chromatography (HPLC) coupled with diode array detector and mass spectrometry (DAD-MS)" pps
... using high-performance liquid chromatography coupled with diode array detector and mass spectrometry (HPLCDAD-ESI -MS) and to assess the quality of two commercial mycelial AC products Methods Plant ... methods have been established for AC As widely used in the quality control practices for other herbs, chromatographic fingerprinting is simple and useful Thus, this study aims to identify the ... likely to be ionized with cations such as H+ , K+, and Na + , thus facilitating the ESI -MS detection Figure shows Page of the chromatographic profile of the water extract of mycelial AC Comprehensive...
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Novel lipidomic approaches to analyse glycerophospholipids and sphingolipids in complex mixtures using mass spectrometry
... OH O O P-O R O OH O O PhosphatidylPhosphatidylserine glycerol OH HO O O OH O OH HO OH O P OH H C H O P OH HO O HO O O P OH H N+ O O O H3 C N+ HO HO P OH -O H H OH OS O H3 C -O HOO OH O OH InositolphosphorylHO ... linked to a glycoside moiety, which can be itself acylated A HO HO HO H Phosphatidic acid OH OH OH Phosphatidylinositol H H N+ H OH Phosphatidylethanolamine H3 C H3 C N+ H3 C OH +H N H -O OH C O HO ... Phosphatidic acid Glycerophosphocholine Glycerophosphoethanolamine Glycerophosphoglycerol Glycerophosphoinositol Glycerophosphoinositol phosphate Glycerophosphoinositol bisphosphate Glycerophosphoinositol...
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Development and application of mass spectrometry based proteomics technologies to decipher ku70 functions
... each molecule Mass spectrometry is an instrument designed to measure molecular weight accurately, and thus to characterize the molecule through its molecular weight The application of mass spectrometry ... 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide electrospray ionization histone acetyltransferase histone deacetylase histone deacetylase inhibitors high-performance liquid chromatography iodoacetamide ... containing chromatographic material polymerized into pipette tips (ZipTips, Millipore) have also been introduced and are widely used However, both of them have some shortcomings New methods which have...
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Mass Spectrometry A Textbook, 2nd Edition Jurgen H. Gross
... collections of schemes and photographs for use in this book The author wishes to express his thanks to those scientists, many of them from the University of Heidelberg, who generously allowed to use material ... Is Mass Spectrometry? Note: Some mass spectrometrists use the unit thomson [Th] (to honor J J Thomson) instead of the dimensionless quantity m/z Although the thomson is widely accepted (or tolerated), ... the chromatographic detector (GC -MS and LC -MS, Chaps 5.4, 5.5 and 14) its output must somehow represent the chromatogram that would have been obtained with other chromatographic detectors (FID,...
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Determination of EDTA in Water Samples by SPE-Gas Chromatography/Mass Spectrometry
... chromatography /mass spectrometry analysis Gas chromatography was carried out by using HP6890 series gas chromatography system (Hewlett Packard, Wilmington, DE, USA) with an HP6890 series auto ... Technology, Vol 8, No.4, 2010 chromatography (Nowack et al., 1996; Kemmei et al., 2009), ion chromatography /mass spectrometry (Bauer et al., 1999; Knepper et al., 2005), gas chromatography /mass ... method The next stage to add this new SPE-derivatization-GC /MS method to the Japanese Standard Methods for the Examintion of Water would be to perform an inter-laboratory validation study of the...
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