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Full-Text Articles in Biochemistry
Amyloid Fibril Formation And Polymorphism : A Critical Role Of Sulfur-Containing Amino Acid Residues, Tatiana Quiñones-Ruiz
Amyloid Fibril Formation And Polymorphism : A Critical Role Of Sulfur-Containing Amino Acid Residues, Tatiana Quiñones-Ruiz
Legacy Theses & Dissertations (2009 - 2024)
Protein aggregation that results in the formation of amyloid fibrils has been linked to many neurodegenerative disorders, including Alzheimer’s disease and Parkinson’s disease. The sulfur atoms in methionine (Met) and cysteine (Cys) residues of proteins can be readily oxidized, significantly affecting their properties. Oxidation of sulfur-containing amino acids has recently been shown to affect protein fibrillation. This work presents novel findings on Cys and Met redox reactions that are related to the formation of amyloid fibrils and on the polymorphism of a model fibrillogenic protein, hen egg white lysozyme (HEWL). Biophysical techniques including Raman spectroscopy, atomic force microscopy, electron paramagnetic …
New Tools To Study Amyloid Fibrils And Intrinsically Disordered Proteins In Vitro And In Vivo, Jacqueline D. Washington
New Tools To Study Amyloid Fibrils And Intrinsically Disordered Proteins In Vitro And In Vivo, Jacqueline D. Washington
Legacy Theses & Dissertations (2009 - 2024)
Amyloid fibrils are β-sheet-rich protein aggregates commonly found in the organs and tissues of patients with various amyloid-associated diseases. The structure of insulin fibrils was characterized by deep ultraviolet resonance Raman and Nuclear Magnetic Resonance spectroscopy combined with hydrogen-deuterium exchange. Our new approach of combining NMR and Raman spectroscopy with molecular dynamic simulations for characterizing amyloid fibrils provided exclusive knowledge about fibril structure at amino acid residue resolution.
Advanced Statistical Methods For Biochemical And Forensic Applications Of Raman Spectroscopy, Vitali Sikirzhytski
Advanced Statistical Methods For Biochemical And Forensic Applications Of Raman Spectroscopy, Vitali Sikirzhytski
Legacy Theses & Dissertations (2009 - 2024)
This work is dedicated to the development and application of advanced statistical methods for biochemical and forensic applications of Raman spectroscopy. We developed a new concept of multidimensional Raman signatures for forensic identification of body fluid traces, which was successfully applied to the study of dried blood, semen, saliva, sweat and vaginal fluid stains. Several alternative advanced chemometric techniques were also successfully tested for the problems of pure body fluids discrimination and mixture analysis. Studies of body fluid mixtures with low blood and semen concentrations indicated that the detection limit of a minor contributor was as low as a few …