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Fuentes MÁ, Kennedy AR, Mulvey RE, Parkinson JA, Rantanen T, Robertson SD, Snieckus V. Adding a Structural Context to the Deprotometalation and Trans-Metal Trapping Chemistry of Phenyl-Substituted Benzotriazole. Chemistry 2015; 21:14812-22. [DOI: 10.1002/chem.201502534] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Indexed: 11/06/2022]
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McKenna JM, Parkinson JA. HOBS methods for enhancing resolution and sensitivity in small DNA oligonucleotide NMR studies. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2015; 53:249-255. [PMID: 25353689 DOI: 10.1002/mrc.4182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 09/30/2014] [Accepted: 10/13/2014] [Indexed: 06/04/2023]
Abstract
(1) H NMR spectra from biopolymers give chemical shifts classified according to proton type and often suffer from signal degeneracy. Data from nucleic acids are particularly prone to this failing. Recent developments in proton broadband decoupling techniques with the promise of enhanced resolution at full sensitivity have allowed us to investigate the application of homonuclear band-selective (HOBS) decoupling to the study of small synthetic DNA molecules and to compare these with results from classical and pure shift techniques. Improved signal resolution at full sensitivity in both HOBS-1D (1) H and HOBS-2D [(1) H, (1) H] NOESY NMR data is reported for three example small DNA molecules. Comparisons of (1) H T1 and integrals of signals from HOBS-1D (1) H and HOBS-2D [(1) H, (1) H] NOESY NMR data with those of standard data collection methods are also reported. The results show that homonuclear HOBS-NOESY data are useful for data assignment purposes and have some merit for quantification purposes. In general, we show that resolution and sensitivity enhancement of (1) H NMR data for small DNA samples may be achieved without recourse to higher magnetic field strength at full sensitivity in a band-selected manner.
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Hernandez Santiago AA, Buchelnikov AS, Rubinson MA, Yesylevskyy SO, Parkinson JA, Evstigneev MP. Shape-independent model (SHIM) approach for studying aggregation by NMR diffusometry. J Chem Phys 2015; 142:104202. [DOI: 10.1063/1.4913974] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Brown JA, Cochrane AR, Irvine S, Kerr WJ, Mondal B, Parkinson JA, Paterson LC, Reid M, Tuttle T, Andersson S, Nilsson GN. Inside Cover: The Synthesis of Highly Active Iridium(I) Complexes and their Application in Catalytic Hydrogen Isotope Exchange (Adv. Synth. Catal. 17/2014). Adv Synth Catal 2014. [DOI: 10.1002/adsc.201401054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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Brown JA, Cochrane AR, Irvine S, Kerr WJ, Mondal B, Parkinson JA, Paterson LC, Reid M, Tuttle T, Andersson S, Nilsson GN. The Synthesis of Highly Active Iridium(I) Complexes and their Application in Catalytic Hydrogen Isotope Exchange. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400730] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
We investigated whether appearance motive for sun exposure, which strongly predicts exposure behaviour, would predict reactions to safe sun messages. In a survey with an embedded experiment, 245 individuals completed measures of motives, read a safe sun message framed by incentive (appearance/health), tone (directive/nondirective) and valence (gain/loss), then completed measures of reactions. For participants high in appearance motive, an appearance-nondirective message was most persuasive. Regardless of individual's appearance motive, appearance messages produced lower reactance if phrased using nondirective language. To maximise persuasion and minimise reactance in individuals most motivated to sun expose, safe sun messages should focus on appearance using nondirective language.
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Alniss HY, Salvia MV, Sadikov M, Golovchenko I, Anthony NG, Khalaf AI, MacKay SP, Suckling CJ, Parkinson JA. Recognition of the DNA minor groove by thiazotropsin analogues. Chembiochem 2014; 15:1978-90. [PMID: 25045155 DOI: 10.1002/cbic.201402202] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Indexed: 01/14/2023]
Abstract
Solution-phase self-association characteristics and DNA molecular-recognition properties are reported for three close analogues of minor-groove-binding ligands from the thiazotropsin class of lexitropsin molecules; they incorporate isopropyl thiazole as a lipophilic building block. Thiazotropsin B (AcImPy(iPr) ThDp) shows similar self-assembly characteristics to thiazotropsin A (FoPyPy(iPr) ThDp), although it is engineered, by incorporation of imidazole in place of N-methyl pyrrole, to swap its DNA recognition target from 5'-ACTAGT-3' to 5'-ACGCGT-3'. Replacement of the formamide head group in thiazotropsin A by nicotinamide in AIK-18/51 results in a measureable difference in solution-phase self-assembly character and substantially enhanced DNA association characteristics. The structures and associated thermodynamic parameters of self-assembled ligand aggregates and their complexes with their respective DNA targets are considered in the context of cluster targeting of DNA by minor-groove complexes.
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Gaca KZ, Parkinson JA, Lue L, Sefcik J. Equilibrium Speciation in Moderately Concentrated Formaldehyde–Methanol–Water Solutions Investigated Using 13C and 1H Nuclear Magnetic Resonance Spectroscopy. Ind Eng Chem Res 2014. [DOI: 10.1021/ie403252x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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34
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Rawling MJ, Rowley JH, Campbell M, Kennedy AR, Parkinson JA, Tomkinson NCO. Mechanistic insights into the malonoyl peroxide syn-dihydroxylation of alkenes. Chem Sci 2014. [DOI: 10.1039/c3sc53256a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
A detailed mechanistic understanding of the malonoyl peroxide mediated dihydroxylation of alkenes is presented.
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Laurenson JAB, Parkinson JA, Percy JM, Rinaudo G, Roig R. Multigramme synthesis and asymmetric dihydroxylation of a 4-fluorobut-2E-enoate. Beilstein J Org Chem 2013; 9:2660-8. [PMID: 24367430 PMCID: PMC3869297 DOI: 10.3762/bjoc.9.301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 11/08/2013] [Indexed: 11/29/2022] Open
Abstract
Esters of crotonic acid were brominated on a multigramme scale using a free radical procedure. A phase transfer catalysed fluorination transformed these species to the 4-fluorobut-2E-enoates reproducibly and at scale (48-53%, ca. 300 mmol). Asymmetric dihydroxylation reactions were then used to transform the butenoate, ultimately into all four diastereoisomers of a versatile fluorinated C4 building block at high enantiomeric-enrichment. The (DHQ)2AQN and (DHQD)2AQN ligands described by Sharpless were the most effective. The development and optimisation of a new and facile method for the determination of ee is also described; (19)F{(1)H} spectra recorded in d-chloroform/diisopropyl tartrate showed distinct baseline separated signals for different enantiomers.
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Bogacki R, Gill DM, Kerr WJ, Lamont S, Parkinson JA, Paterson LC. Flexible access to conformationally-locked bicyclic morpholines. Chem Commun (Camb) 2013; 49:8931-3. [PMID: 23963244 DOI: 10.1039/c3cc45627g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A preparatively accessible route to a series of conformationally-locked bicyclic morpholines has been developed. This flexible approach allows for diversification in order for a small array of lead-like scaffolds to be synthesised from readily available key building blocks.
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Zou J, Parkinson JA, Sadler PJ. Gold(III)-Induced Oxidation of Amino Acids and Malonic Acid: Reaction Pathways Studied by NMR Spectroscopy with Isotope Labelling. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200200078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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38
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Gaca KZ, Parkinson JA, Sefcik J. Molecular Speciation and Mesoscale Clustering in Formaldehyde–Methanol–Water Solutions in the Presence of Sodium Carbonate. J Phys Chem B 2013; 117:10548-55. [DOI: 10.1021/jp405731g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Prylutskyy YI, Buchelnikov AS, Voronin DP, Kostjukov VV, Ritter U, Parkinson JA, Evstigneev MP. C60 fullerene aggregation in aqueous solution. Phys Chem Chem Phys 2013; 15:9351-60. [PMID: 23660696 DOI: 10.1039/c3cp50187f] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In the present work we develop a novel approach for quantification of the energetics of C60 fullerene aggregation in aqueous media in terms of equilibrium aggregation constant KF. In particular, it is shown that the experimental determination of the magnitude of KF is possible only within the framework of the 'up-scaled aggregation model', considering the C60 fullerene water solution as a solution of fullerene clusters. Using dynamic light scattering (DLS) data we report the value, K(F) = 56,000 M(-1), which is in good agreement with existing theoretical estimates and the results of energetic analyses. It is suggested that the proposed 'up-scaled model' may be used in any instances of non-specific aggregation resulting in formation of large spherical particles. The measurement of the translational diffusion coefficient and the dimensions of the light scattering particles using a DLS approach with respect to C60 fullerene aggregates is found to contain significant systematic errors originating from the interaction effect that is well-known for micellar solutions. As a result, corrections to the equations associated with DLS data are proposed.
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Salvia MV, Addison F, Alniss HY, Buurma NJ, Khalaf AI, Mackay SP, Anthony NG, Suckling CJ, Evstigneev MP, Santiago AH, Waigh RD, Parkinson JA. Thiazotropsin aggregation and its relationship to molecular recognition in the DNA minor groove. Biophys Chem 2013; 179:1-11. [PMID: 23714424 DOI: 10.1016/j.bpc.2013.04.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 04/19/2013] [Accepted: 04/19/2013] [Indexed: 11/29/2022]
Abstract
Aggregated states have been alluded to for many DNA minor groove binders but details of the molecule-on-molecule relationship have either been under-reported or ignored. Here we report our findings from ITC and NMR measurements carried out with AIK-18/51, a compound representative of the thiazotropsin class of DNA minor groove binders. The free aqueous form of AIK-18/51 is compared with that found in its complex with cognate DNA duplex d(CGACTAGTCG)2. Molecular self-association of AIK-18/51 is consistent with anti-parallel, face-to-face dimer formation, the building block on which the molecule aggregates. This underlying structure is closely allied to the form found in the ligand's DNA complex. NMR chemical shift and diffusion measurements yield a self-association constant Kass=(61±19)×10(3)M(-1) for AIK-18/51 that fits with a stepwise self-assembly model and is consistent with ITC data. The deconstructed energetics of this assembly process are reported with respect to a design strategy for ligand/DNA recognition.
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Alzweiri M, Watson DG, Parkinson JA. METABONOMICS AS A CLINICAL TOOL OF ANALYSIS: LC-MS APPROACHES. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2011.644054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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42
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Saßmannshausen J, Klett J, Kennedy AR, Parkinson JA, Armstrong D. Taming the shrew: [TMEDALi-Zn(C2H4)2L] as a model compound for anionic ethene polymerisation. NEW J CHEM 2013. [DOI: 10.1039/c2nj40874k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Parkinson JA, Scott FJ, Suckling CJ, Wilson G. Exceptionally strong intermolecular association in hydrophobic DNA minor groove binders and their potential therapeutic consequences. MEDCHEMCOMM 2013. [DOI: 10.1039/c3md00071k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Mills A, Hazafy D, Parkinson JA, Tuttle T, Hutchings MG. Comment on "Solvent effect on the electronic spectra of azine dyes under alkaline condition". J Phys Chem A 2012; 113:9575-6; author reply 9577. [PMID: 23057085 DOI: 10.1021/jp9030927] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Lawrence NS, Hinton EC, Parkinson JA, Lawrence AD. Nucleus accumbens response to food cues predicts subsequent snack consumption in women and increased body mass index in those with reduced self-control. Neuroimage 2012; 63:415-22. [PMID: 22776461 DOI: 10.1016/j.neuroimage.2012.06.070] [Citation(s) in RCA: 160] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 06/28/2012] [Accepted: 06/30/2012] [Indexed: 01/01/2023] Open
Abstract
Individuals have difficulty controlling their food consumption, which is due in part to the ubiquity of tempting food cues in the environment. Individual differences in the propensity to attribute incentive (motivational) salience to and act on these cues may explain why some individuals eat more than others. Using fMRI in healthy women, we found that food cue related activity in the nucleus accumbens, a key brain region for food motivation and reward, was related to subsequent snack food consumption. However, both nucleus accumbens activation and snack food consumption were unrelated to self-reported hunger, or explicit wanting and liking for the snack. In contrast, food cue reactivity in the ventromedial prefrontal cortex was associated with subjective hunger/appetite, but not with consumption. Whilst the food cue reactivity in the nucleus accumbens that predicted snack consumption was not directly related to body mass index (BMI), it was associated with increased BMI in individuals reporting low self-control. Our findings reveal a neural substrate underpinning automatic environmental influences on consumption in humans and demonstrate how self-control interacts with this response to predict BMI. Our data provide support for theoretical models that advocate a 'dual hit' of increased incentive salience attribution to food cues and poor self-control in determining vulnerability to overeating and overweight.
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Kostjukov VV, Santiago AAH, Rodriguez FR, Castilla SR, Parkinson JA, Evstigneev MP. Energetics of ligand binding to the DNA minor groove. Phys Chem Chem Phys 2012; 14:5588-600. [DOI: 10.1039/c2cp40182g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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47
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Jolly PI, Zhou S, Thomson DW, Garnier J, Parkinson JA, Tuttle T, Murphy JA. Imidazole-derived carbenes and their elusive tetraazafulvalene dimers. Chem Sci 2012. [DOI: 10.1039/c2sc20054f] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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48
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Armstrong DR, Kennedy AR, Mulvey RE, Parkinson JA, Robertson SD. Opening the black box of mixed-metal TMP metallating reagents: direct cadmation or lithium–cadmium transmetallation? Chem Sci 2012. [DOI: 10.1039/c2sc20392h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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49
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Alniss HY, Anthony NG, Khalaf AI, Mackay SP, Suckling CJ, Waigh RD, Wheate NJ, Parkinson JA. Rationalising sequence selection by ligand assemblies in the DNA minor groove: the case for thiazotropsin A. Chem Sci 2012. [DOI: 10.1039/c2sc00630h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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50
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Nelson DJ, Ashworth IW, Hillier IH, Kyne SH, Pandian S, Parkinson JA, Percy JM, Rinaudo G, Vincent MA. Why is RCM Favoured Over Dimerisation? Predicting and Estimating Thermodynamic Effective Molarities by Solution Experiments and Electronic Structure Calculations. Chemistry 2011; 17:13087-94. [DOI: 10.1002/chem.201101662] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 08/11/2011] [Indexed: 11/09/2022]
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