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Articles 1 - 8 of 8
Full-Text Articles in Organic Chemicals
Protein Allostery Probed By Ligands Across Sites, Virgil A. Woods
Protein Allostery Probed By Ligands Across Sites, Virgil A. Woods
Dissertations, Theses, and Capstone Projects
Allostery is a pervasive regulatory principle throughout biology, yet the structural pathways by which distal inputs alter active‑site chemistry within protein structures remain incompletely defined and exploited. This dissertation uses protein tyrosine phosphatase 1B (PTP1B) as a tractable model to map those pathways with complementary experimental and computational tools. I integrate high‑resolution hydrogen-deuterium exchange mass spectrometry (HDX-MS), room-temperature crystallography, NMR, steady-state kinetics, crystallographic pseudo-ensembles, and machine-learning-guided ligand discovery. The working premise is that regulation reflects redistribution within a conformational ensemble rather than a binary switch. That orthogonal perturbations by small molecules, mutations, and protein partners can be used to both …
Nanoparticles For Applications In Specific Diagnostics And Precision Medicine, Naxhije Berisha
Nanoparticles For Applications In Specific Diagnostics And Precision Medicine, Naxhije Berisha
Dissertations, Theses, and Capstone Projects
Heterogeneity is common in the expression of cancer and treatment response. Precision medicine enables healthcare providers to tailor medical care to an individual's distinct genetic and environmental makeup. This customization has the potential to result in more efficient treatments while minimizing side effects. We believe that by studying the interface of nanotechnology and cancer medicine we can elucidate innovative solutions that address the challenges of disease heterogeneity. This includes advancements in drug delivery, formulations development, and diagnostic sensing. We highlight three studies that use nanotechnology for applications in precision medicine. In Chapter 2, we highlight design optimization of drug formulations …
Second Generation Phenyloxadiazolyl Methyl Sulfones For Thiol-Specific Bioconjugations, Guillaume Dewaele-Le Roi
Second Generation Phenyloxadiazolyl Methyl Sulfones For Thiol-Specific Bioconjugations, Guillaume Dewaele-Le Roi
Dissertations, Theses, and Capstone Projects
The role of antibody-based molecular agents for diagnosis and therapy of cancer has expanded significantly over the past decades. However, most of these constructs are synthesized using traditional bioconjugation methods based on the random ligations between the molecular cargo and lysine residues within the protein. These non-specific approaches can create poorly defined conjugates with suboptimal immunoreactivity and in vivo performance while Site-specific approaches to antibody bioconjugation based on ligations between maleimides and free cysteine residues have long stood as attractive alternatives. Yet the inherent instability of the thiol-maleimide linkage has fueled the search for new, more stable thiol-reactive prosthetic groups. …
Synthesis And Evaluation Of C-10 Nitrogenated Aporphine Alkaloids At Serotonin And Dopamine Receptors, Anupam Karki
Synthesis And Evaluation Of C-10 Nitrogenated Aporphine Alkaloids At Serotonin And Dopamine Receptors, Anupam Karki
Dissertations, Theses, and Capstone Projects
Aporphine alkaloids, belonging to the isoquinoline class of compounds, have been investigated as a potential source of ligands for Central Nervous System (CNS) receptors. Previous research indicates that the aporphine scaffold may be manipulated to synthesize selective ligands for serotonin and dopamine receptors. Novel aporphine alkaloids containing C10 nitrogen substitutions were synthesized, and their affinities were evaluated at serotonin (5-HT1A, 5-HT1B, 5-HT2A, 5-HT7A) receptors and dopamine (D1, D2, D3, D4, and D5) receptors. Two series of racemic aporphine compounds with C10 nitrogenous functionalities were synthesized and analyzed at the aforementioned receptors. The first series of aporphine alkaloids contain C10 nitro, …
Nature-Inspired Electrode Materials For Next Generation Sustainable Energy Storage, Mikhail Miroshnikov
Nature-Inspired Electrode Materials For Next Generation Sustainable Energy Storage, Mikhail Miroshnikov
Dissertations, Theses, and Capstone Projects
Despite revolutionizing the world of portable electronics, the contemporary lithium-ion battery (LIB) suffers from challenges associated with the cost, safety, and environmental impact of transition metal oxide-based intercalation cathodes. To alleviate these issues, naturally occurring organic molecules may serve as sustainable alternatives to traditional inorganic cathode materials. The electrochemical properties of organic compounds are derived from redox-active functional groups containing oxygen, nitrogen and sulfur. Additionally, these functional groups are capable of coordinating metal ions beyond lithium, allowing for compatibility with sodium-ion batteries (SIBs) and other earth abundant metal-based energy storage systems. However, despite competitive performance against commercialized cathode materials, much …
Heterocycle Synthesis From Quinols, Jing Wu
Heterocycle Synthesis From Quinols, Jing Wu
Dissertations, Theses, and Capstone Projects
Three cascade reactions that provide access to various heterocyclic skeletons from quinols were developed. Various substituted 1-hydroxyacridones, 4-hydroxycarbazoles and 4-hydroxy-indolin-3-ones were readily synthesized in moderate to excellent yields. The common sequential transformation involves carbamation/Michael addition/mixed Claisen condensation/decarboxylative aromatization which were realized in one-pot reactions in the synthesis of acridones and indolin-3-ones, or two-step reactions in the synthesis of carbazoles. A side reaction from oxidative dearomatization of phenols, affording iodo diaryl ethers in one step from commercial phenols, albeit in low yields, revealed an intricate mechanistic pathway. The synthesis of jaboticabin was realized in nine linear steps from commercial phloroglucinol and …
Catalyzed And Uncatalyzed Modifications Of Nucleosides, Synthesis Of Hippadine, And Deuterated 1,2,3-Triazoles, Hari K. Akula
Catalyzed And Uncatalyzed Modifications Of Nucleosides, Synthesis Of Hippadine, And Deuterated 1,2,3-Triazoles, Hari K. Akula
Dissertations, Theses, and Capstone Projects
The C4 amide carbonyl of O-t-butyldimethylsilyl-protected thymidine, 2’-deoxyuridine, and 3’-azidothymidine (AZT) was activated by reaction with (benzotriazol-1-yloxy)tris(dimethylamino) phosphonium hexafluorophosphate (BOP) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in THF as solvent. This led to the formation of corresponding O4-(benzotriazol-1-yl) derivatives, which are reactive intermediates. Substitution at the C4 position was then carried out by reactions with alkyl and aryl amines, and thiols. Typically, reactions were conducted as a two-step, one-pot transformation, and also as a one-step conversion. After examining the reactions, the formation of 1-(4-pyrimidinyl)-1H-benzotriazole-3-oxide derivatives from the pyrimidine nucleosides was identified. However, these too underwent conversion to …
New Dyes For Cancer Theranostics, Waqar Rizvi
New Dyes For Cancer Theranostics, Waqar Rizvi
Dissertations, Theses, and Capstone Projects
Porphyrinoids are robust heterocyclic dyes studied extensively for applications in medicine and as photonic materials because of their tunable photophysical properties, diverse means of modifying the periphery, and the ability to chelate most transition metals. Commercial applications include phthalocyanine dyes in optical discs, porphyrins in photodynamic therapy, and as oxygen sensors. Most applications of these dyes require exocyclic moieties to improve solubility, target disease, modulate photophysical properties, or direct self-organization into architectures with desired photonic properties. The synthesis of the porphyrinoid depends on the desired application, but the de novo synthesis often involves several steps, is time consuming, and results …