ORCID Profile
0000-0002-2623-6287
Current Organisation
University of Nottingham
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Publisher: Wiley
Date: 12-12-2002
Publisher: Wiley
Date: 14-03-2002
DOI: 10.1046/J.1432-1327.2002.02819.X
Abstract: Two DNA hairpin motifs (5'-GCGAAGC-3' and 5'-ACGA AGT-3'), both stabilized by a 5'-GAA loop, have been used to design novel intramolecular double hairpin structures (5'-GCGAAGCACGAAGT-3' and 5'-ACGAAGTGCG AAGC-3') in which coaxial stacking of the two hairpin components generates a double-stranded stem region effectively with a single-strand break in the middle of the sequence at either the TG or CA step between unconnected 3' and 5' terminal bases. We have investigated by NMR the conformation and dynamics of the DNA at the strand break site. We show that mutual stacking significantly enhances the stability of each hairpin. Further, the anthracycline antibiotic nogalamycin binds cleanly to the 5'-TG (5'-CA) site formed by the mutually stacked hairpins despite the break in the sugar-phosphate backbone on one strand. The complex resembles the structure of nogalamycin-DNA complexes with the drug bound at 5'-TG sites in intact duplex sequences, with pi-stacking interactions probably the single dominant stabilizing interaction.
Publisher: Wiley
Date: 19-10-2020
Publisher: Springer Science and Business Media LLC
Date: 10-03-2013
DOI: 10.1038/NCHEM.1596
Publisher: Wiley
Date: 02-2017
Abstract: The structurally unique polyazole antibiotic goadsporin contains six heteroaromatic oxazole and thiazole rings integrated into a linear array of amino acids that also contains two dehydroalanine residues. An efficient total synthesis of goadsporin is reported in which the key steps are the use of rhodium(II)-catalyzed reactions of diazocarbonyl compounds to generate the four oxazole rings, which demonstrates the power of rhodium carbene chemistry in organic chemical synthesis.
Publisher: Springer Science and Business Media LLC
Date: 26-01-2013
DOI: 10.1007/S12154-012-0090-1
Abstract: In this paper we report the molecular profiling, lipidome and proteome, of the plant organelle known as an oil body (OB). The OB is remarkable in that it is able to perform its biological role (storage of triglycerides) whilst resisting the physical stresses caused by changes during desiccation (dehydration) and germination (rehydration). The molecular profile that confers such extraordinary physical stability on OBs was determined using a combination of 31 P/ 1 H nuclear magnetic resonance (NMR), high-resolution mass spectrometry and nominal mass-tandem mass spectrometry for the lipidome, and gel-electrophoresis-chromatography-tandem mass spectrometry for the proteome. The integrity of the procedure for isolating OBs was supported by physical evidence from small-angle neutron-scattering experiments. Suppression of lipase activity was crucial in determining the lipidome. There is conclusive evidence that the latter is dominated by phosphatidylcholine (∼60 %) and phosphatidylinositol (∼20 %), with a variety of other head groups (∼20 %). The fatty acid profile of the surface monolayer comprised palmitic, linoleic and oleic acids (2:1:0.25, 1 H NMR) with only traces of other fatty acids (C24:0, C22:0, C18:0, C18:3, C16:2 by MS). The proteome is rich in oleosins (78 %) with the remainder being made up of caleosins and steroleosins. These data are sufficiently detailed to inform an update of the understood model of this organelle and can be used to inform the use of such components in a range of molecular biological, biotechnological and food industry applications. The techniques used in this study for profiling the lipidome throw a new light on the lipid profile of plant cellular compartments.
Publisher: Wiley
Date: 03-12-2021
Abstract: Post‐translational modifications (PTMs) enhance the repertoire of protein function and mediate or influence the activity of many cellular processes. The preparation of site‐specifically and homogeneously modified proteins, to apply as tools to understand the biological role of PTMs, is a challenging task. Herein, we describe a visible‐light‐mediated desulfurative C(sp 3 )–C(sp 3 ) bond forming reaction that enables the site‐selective installation of N ϵ ‐modified sidechains into peptides and proteins of interest. Rapid, operationally simple, and tolerant to ambient atmosphere, we demonstrate the installation of a range of lysine (Lys) PTMs into model peptide systems and showcase the potential of this technology by site‐selectively installing an N ϵ Ac sidechain into recombinantly expressed ubiquitin (Ub).
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B910505K
Abstract: We report CD, ESI-MS and molecular modelling studies of ligand binding interactions with DNA quadruplex structures derived from the human telomeric repeat sequence (h-Tel) and the proto-oncogenic c-kit promoter sequence. These sequences form anti-parallel (both 2 + 2 and 3 + 1) and parallel conformations, respectively, and demonstrate distinctively different degrees of structural plasticity in binding ligands. With h-Tel, we show that an extended heteroaromatic 1,4-triazole (TRZ), designed to exploit pi-stacking interactions and groove-specific contacts, shows some selectivity for parallel folds, however, the polycyclic fluorinated acridinium cation (RHPS4), which is a similarly potent telomerase inhibitor, shows selectivity for anti-parallel conformations implicating favourable interactions with lateral and diagonal loops. In contrast, the unique c-kit parallel-stranded quadruplex shows none of the structural plasticity of h-Tel with either ligand. We show by quantitative ESI-MS analysis that both sequences are able to bind a ligand on either end of the quadruplex. In the case of h-Tel the two sites have similar affinities, however, in the case of the c-kit quadruplex the affinities of the two sites are different and ligand-dependent. We demonstrate that two different small molecule architectures result in significant differences in selectivity for parallel and anti-parallel quadruplex structures that may guide quadruplex targeted drug-design.
Publisher: Wiley
Date: 03-12-2021
Abstract: Post‐translational modifications (PTMs) enhance the repertoire of protein function and mediate or influence the activity of many cellular processes. The preparation of site‐specifically and homogeneously modified proteins, to apply as tools to understand the biological role of PTMs, is a challenging task. Herein, we describe a visible‐light‐mediated desulfurative C(sp 3 )–C(sp 3 ) bond forming reaction that enables the site‐selective installation of N ϵ ‐modified sidechains into peptides and proteins of interest. Rapid, operationally simple, and tolerant to ambient atmosphere, we demonstrate the installation of a range of lysine (Lys) PTMs into model peptide systems and showcase the potential of this technology by site‐selectively installing an N ϵ Ac sidechain into recombinantly expressed ubiquitin (Ub).
Publisher: Royal Society of Chemistry (RSC)
Date: 2001
DOI: 10.1039/B009904J
Publisher: Wiley
Date: 25-04-2019
Publisher: Wiley
Date: 19-10-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0DT03972A
Abstract: Spectroscopic and computational investigation of the effects of para -substituted m -terphenyl lithium complexes reveals significant electronic differences at the metal centre.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6CC07243G
Abstract: Isocyanurates can be synthesised through the cyclotrimerisation of primary isocyanates catalysed by low-coordinate manganese( ii ) and iron( ii ) m -terphenyl complexes under mild conditions.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Huw Williams.