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Articles 61 - 90 of 103
Full-Text Articles in Biochemistry
Novel Nmr Based Technologies To Study Macromolecular Structures, Subhabrata Majumder
Novel Nmr Based Technologies To Study Macromolecular Structures, Subhabrata Majumder
Legacy Theses & Dissertations (2009 - 2024)
Nuclear Magnetic Resonance Spectroscopy (NMR) is one of the principle tools in structural biology to probe macromolecular structures and interactions. The atomic resolution afforded by this technique has been widely used to probe protein-protein, and protein-ligand interactions in-vitro. However, the natural milieu of the proteins is the living cell and the cellular cytoplasm is extremely heterogeneous. The NMR studies of folded protein in-cell, till now, have been limited by non-specific interactions of the cytosol. This thesis outlays a general methodology to study protein structure/interactions inside the living cells using NMR. In a closely related objective, it also describes the use …
Monitoring Ligand-Induced Nucleic Acid Conformational Changes Using Ion Mobility Spectrometry-Mass Spectrometry, Bill Kenneth Redick
Monitoring Ligand-Induced Nucleic Acid Conformational Changes Using Ion Mobility Spectrometry-Mass Spectrometry, Bill Kenneth Redick
Legacy Theses & Dissertations (2009 - 2024)
Three-dimensional structures of biopolymers frequently dictate the biological role those molecules play. As such, investigation into structure of nucleic acids can provide important information pertaining to how those nucleic acids work. Many nucleic acid species, especially single-stranded RNA, fold into unique structures that allow them to function properly. Metals, and other cationic species, are often bound to the nucleic acid to make folding into the proper structure more favorable by neutralizing the negative charge on the nucleic acid imparted by the phosphate group. This investigation explores tertiary structure of nucleic acids that have been folded in the presence of ligands …
Ph Regulation And The Assessment Of Renal Injury Biomarkers In A Warm Perfusion Renal Allograft Preservation System, Aaron Meyer
Ph Regulation And The Assessment Of Renal Injury Biomarkers In A Warm Perfusion Renal Allograft Preservation System, Aaron Meyer
Legacy Theses & Dissertations (2009 - 2024)
A shortage of viable kidneys available for transplantation exists today, as the number of individuals waiting for a kidney transplant continues to grow while the number of kidneys available each year for transplantation has remained stagnant. The development of technology that will allow for transplantation of organs that currently may be considered too damaged for transplant will provide access to a large number of donors who have experienced traumatic injury deaths resulting in loss of cardiac function. These potential donors account for the majority of all traumatic injury deaths in intensive care units, however their organs have experienced a degree …
Mechanisms Of Dna Synthesis And Fidelity By Y-Family Translesion And C-Family Replicative Polymerases, Purba Mukherjee
Mechanisms Of Dna Synthesis And Fidelity By Y-Family Translesion And C-Family Replicative Polymerases, Purba Mukherjee
Legacy Theses & Dissertations (2009 - 2024)
Since the discovery of the DNA polymerase by Arthur Kornberg nearly 60 years ago, there have been great advances in understanding the involvement of polymerases in replication and repair. Years of genetic, biochemical and structural studies have lead to the classification of DNA-dependent DNA polymerases into six families: A, B, C, D, X and Y. In this work, I have focussed on two different families, C and Y. Hence this work is divided into two parts. Part one discusses the studies on Y-family polymerases. All Y-family polymerases are involved in replicating past DNA lesions. The ability to tolerate unnatural nucleotides …
Modeling The Early, Aging-Related Changes In Human Recombinant Gammas-Crystallin In Vitro, Christiana Oluwaseun Salami
Modeling The Early, Aging-Related Changes In Human Recombinant Gammas-Crystallin In Vitro, Christiana Oluwaseun Salami
Legacy Theses & Dissertations (2009 - 2024)
Cataract is the leading cause of blindness in the world. Cataractous lenses scatter a significant part of the light entering the eye. Cataract can be of several types: Age-related cataract, secondary cataract, traumatic cataract, congenital cataract, and radiation cataract. Age-related cataract is the most common type of cataract. Several factors contribute to age-onset cataract; among them are the Post-Translational Modifications (PTMs) to the major lens proteins or crystallins, which constitute about 80-90% of the protein content of the lens. Predominant PTMs of the crystallins are oxidation, deamidation, phosphorylation, glycation, and disulfide crosslinking, which tend to increase as the lens ages.
Mechanisms Of Age-Related Inflammation And Cancer : The Synergistic Effect Of Oxidants And Calcium, Donald A. Mccarthy
Mechanisms Of Age-Related Inflammation And Cancer : The Synergistic Effect Of Oxidants And Calcium, Donald A. Mccarthy
Legacy Theses & Dissertations (2009 - 2024)
The accumulation of senescent cells during the process of aging has been implicated as causal in numerous age-related pathologies. Senescent cells adopt a secretory phenotype consisting of many factors including matrix remodeling enzymes, growth factors, cytokines, and chemokines. Their secretory nature is the primary reason that they are associated with disease, but it remains unclear why they become so inflammatory. Using primary human fibroblasts cultured to senescence, we mechanistically determined why senescent cells are such potent inducers of inflammation. Our findings indicate that the early production of the cytokine Interleukin 1-α (IL-1α) is central to this transition. We found that …
Probing Secondary And Tertiary Rna Folding Using Force And Temperature, William Stephenson
Probing Secondary And Tertiary Rna Folding Using Force And Temperature, William Stephenson
Legacy Theses & Dissertations (2009 - 2024)
RNA folding is the process whereby a single stranded RNA molecule assumes its three-dimensional functional conformation. Along with the protein folding problem, the RNA folding problem remains as one of the great unsolved problems in biophysics. Generally RNA folding occurs in a hierarchical manner whereby the sequence of an RNA (primary structure) determines which regions will form helical segments (secondary structure) before further rearrangement and base pairing of secondary structure motifs (tertiary structure). Due to the intimate connection between structure and function within molecular biology, increased familiarity with the thermodynamic and kinetic factors that govern RNA folding will permit the …
Mechanistic Studies Of C- And Y-Family Dna Polymerases, Indrajit Lahiri
Mechanistic Studies Of C- And Y-Family Dna Polymerases, Indrajit Lahiri
Legacy Theses & Dissertations (2009 - 2024)
DISSERTATION ABSTRACT
Raman Spectroscopy Of Blood Serum And Cerebrospinal Fluid And Multivariate Data Analysis For Alzheimer's Disease Diagnostics, Elena Ryzhikova
Raman Spectroscopy Of Blood Serum And Cerebrospinal Fluid And Multivariate Data Analysis For Alzheimer's Disease Diagnostics, Elena Ryzhikova
Legacy Theses & Dissertations (2009 - 2024)
The efficient and accurate diagnosis at the early stages of dementia is a key moment for effective treatment and productive research to find a new ways to combat the disease. It is especially true for Alzheimer's disease (AD) for which there is no effective cure, but several treatments are known to allow slowing down the degenerative processes. Alzheimer's disease (AD) displays only non-specific clinical symptoms of mental decline for decades after the initiation and is very challenging to differentiate even at the later stages when it becomes very aggressive. Despite the great need, current diagnostic tests are unable to diagnose …
A Structural And Functional Comparison Of Human Immunodeficiency Virus Type 1 Nucleocapsid Protein (Ncp7) And Other Retroviral Nucleocapsid Proteins, Christopher Richard Cavender
A Structural And Functional Comparison Of Human Immunodeficiency Virus Type 1 Nucleocapsid Protein (Ncp7) And Other Retroviral Nucleocapsid Proteins, Christopher Richard Cavender
Legacy Theses & Dissertations (2009 - 2024)
Human immunodeficiency virus type 1 (HIV-1) is a retrovirus belonging to the lentivirus genus of the orthoretrovirinae family. HIV-1 is widely known for causing acquired immunodeficiency syndrome (AIDS) in humans and being responsible for 1.8 million deaths due to AIDS associated illnesses in 201016.
The Genetic Engineering Of Motor Proteins, Rachael M. Hartz
The Genetic Engineering Of Motor Proteins, Rachael M. Hartz
Legacy Theses & Dissertations (2009 - 2024)
Molecular motors are a remarkable feature within living organisms that are responsible for directional mechanical motion, which is driven by adenosine triphosphate (ATP) hydrolysis. Actin-binding molecular motors are of specific interest in the field of nanotechnology as filamentous actin is capable of carrying cargo, such as quantum dots, while it is translocated along a motor coated surface. The binding regions of motor proteins, which are known to interact with actin, such as Myosin, have been thoroughly examined and identified. Rapid genetic engineering of the ATP-hydrolyzing enzyme, adenosine kinase, to incorporate these binding regions is possible through the use of site- …
Protein Structures Under Physiological Conditions, Karl Michael Bertrand
Protein Structures Under Physiological Conditions, Karl Michael Bertrand
Legacy Theses & Dissertations (2009 - 2024)
My research focused on the evaluation of protein structures and protein dynamics inside eukaryotic cells under physiological conditions. The primary analyses of my research involved the use of in-cell Nuclear Magnetic Resonance spectroscopy using Heteronuclear Single Quantum Coherence experiments. This allowed me to visualize protein structures at an atomic resolution level, as well as, study the interactions of these proteins with small molecules.
Molecular Biochemical Study Of The Cataract-Associated Mutants In Human Gammad-Crystallin, Cindy Yeung
Molecular Biochemical Study Of The Cataract-Associated Mutants In Human Gammad-Crystallin, Cindy Yeung
Legacy Theses & Dissertations (2009 - 2024)
Cataract is a vision impairment disease that leads to light scattering and opacity of the eye lens. It is recognized as the most prevalent cause of blindness. Most cataracts occur due to aging, but those that occur in childhood or in young adults are typically of genetic origin. In the young (developing) eye, post–surgical complications such as glaucoma are common after cataract surgery. Hence there is a great need to develop non-surgical intervention strategies for the treatment of cataract. Here, two cataract-associated mutants of human γD-crystallin (HGD): i) Arg76 to Ser (R76S) and ii) a truncation mutation at Trp156 (W156X …
Structural Biology Of The Receptor For Advanced Glycation End Products (Rage), Jing Xue
Structural Biology Of The Receptor For Advanced Glycation End Products (Rage), Jing Xue
Legacy Theses & Dissertations (2009 - 2024)
The receptor for advanced glycated end products (RAGE), due to its location in the major histocompatibility complex class III (MHC III) region, suggests its involvement in immune responses. Because RAGE has been linked to complications of diabetes and chronic inflammation, the severity of Alzheimer's disease and cancer, it's significant to understanding the biological mechanism of signal transduction of RAGE.
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.
Y-Family Dna Polymerases : Mechanism Of Single-Base Deletion And Effect Of Pcna Interaction, Yifeng Wu
Y-Family Dna Polymerases : Mechanism Of Single-Base Deletion And Effect Of Pcna Interaction, Yifeng Wu
Legacy Theses & Dissertations (2009 - 2024)
Translesional synthesis (TLS) by specialized Y-family DNA polymerases is a DNA damage tolerance pathway to bypass DNA lesions that have not been repaired by other DNA repair mechanisms. Despite their valuable lesion bypass ability, the Y-family DNA polymerases display a much lower fidelity upon replicating undamaged DNA. Their activity therefore needs to be well regulated in the cell. In our first project, we examined how an archaeal Y-family DNA polymerase, Dpo4, makes single-base deletions during replication. Dpo4 belongs to the DinB subfamily which is known to make single-base deletions. Although previous studies suggested that it uses a dNTP-stabilized misalignment mechanism, …
The Sxrna Platform : Biophysical Characterization Of Trans-Acting Rna Switches For Gene Expression Control, Christine Bazinet
The Sxrna Platform : Biophysical Characterization Of Trans-Acting Rna Switches For Gene Expression Control, Christine Bazinet
Legacy Theses & Dissertations (2009 - 2024)
In the past decade, microRNAs (miRNAs) have become a hot topic in biochemical research. These very short ~ 22 nucleotide strands of RNA have been recognized as a functional RNA group and found to play a key role in mediating gene regulation along with RNA-binding proteins (RBPs). For example, by binding to the histone stem-loop (HSL) region of the target mRNA, normally in the 3'- untranslated region (UTR), gene expression can either be activated or deactivated for up or down regulation of the gene product. The majority of miRNAs have been found to down regulate gene expression upon binding to …
2'-O-Methyl Substitutions In The Yeast Telomerase Pseudoknot And Their Effects On Telomerase Activity, Katelyn Mae Jasper
2'-O-Methyl Substitutions In The Yeast Telomerase Pseudoknot And Their Effects On Telomerase Activity, Katelyn Mae Jasper
Legacy Theses & Dissertations (2009 - 2024)
Telomerase is a ribonucleoprotein (RNP) complex that synthesizes telomeric repeats at the ends of linear chromosomes to form the DNA–protein complexes known as telomeres. Telomeres protect the ends of chromosomes from degradation during replication due to the end-replication problem. When replication occurs, gaps are created at the beginning of the lagging and leading strands that result in the loss of a small amount of DNA at every replication cycle. By adding thousands of copies of telomeric repeats, the repeats are lost in the replication process and not precious genetic information. The telomerase RNA varies drastically among different species both in …
(S)-Trifluoroselenomethionine : A New Non-Natural Amino Acid With Enhanced Methioninase-Induced Cytotoxicity Toward Human Colon Cancer Cells, Stephene Nathele Lodge
(S)-Trifluoroselenomethionine : A New Non-Natural Amino Acid With Enhanced Methioninase-Induced Cytotoxicity Toward Human Colon Cancer Cells, Stephene Nathele Lodge
Legacy Theses & Dissertations (2009 - 2024)
Abstract
Ultraviolet Resonance Raman Spectroscopy For Characterization Of Rna Structure And Thermodynamics, Joseph Dustin Handen
Ultraviolet Resonance Raman Spectroscopy For Characterization Of Rna Structure And Thermodynamics, Joseph Dustin Handen
Legacy Theses & Dissertations (2009 - 2024)
Raman spectroscopy is a technique well suited for the study of biological molecules such as proteins, peptides, or RNAs. By utilizing an ultraviolet resonance Raman (UVRR) instrument, we are afforded a tremendous increase in sensitivity because of resonance enhancement. Additionally, this technique does not require any labeling. Moreover, this technique is better suited for studying biological systems than infrared absorption due to reduced interference from water. In this study, we apply techniques we have developed for the study of protein and peptide fibrillation to a model RNA homodimer. We demonstrate that UVRR spectroscopy is uniquely suited to monitoring the free …
Structural And Functional Characterization Of Dna Polymerase Ss Mutator Mutants, Sneha Rangarajan
Structural And Functional Characterization Of Dna Polymerase Ss Mutator Mutants, Sneha Rangarajan
Legacy Theses & Dissertations (2009 - 2024)
DNA Polymerase ß (polß) plays a crucial role in repairing damaged DNA in a process called Base Excision Repair (BER). BER is a major pathway of DNA repair, making this system absolutely vital for maintaining genomic integrity. Recent studies estimate 30% of human tumors to contain polß variants that led us to believe that there is a high degree of association between mutations in polß and cancer. In this pathway, after recognition and excision of the damaged base, the DNA is cleaved at an apurinic (AP) site by AP endonuclease leaving behind a 3' hydroxyl and 5' deoxyribose phosphate (dRP). …
Selection Of Chemically Modified Rna Aptamers Against The Glua2q Flop Ampa Receptor, Hyojung Seo
Selection Of Chemically Modified Rna Aptamers Against The Glua2q Flop Ampa Receptor, Hyojung Seo
Legacy Theses & Dissertations (2009 - 2024)
The á-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors play an important role in neurotransmission and synaptic plasticity in the central nervous system. Excessive activity of these receptors has been implicated in some neurodegenerative diseases, such as Parkinson's disease, ischemic stroke and amyotrophic lateral sclerosis (ALS). AMPA receptor inhibitors are therefore drug candidates for potential treatment of these neurological disorders and diseases. The objective of my MS thesis work is to develop a stable aptamer so that it can be tested and used in vivo where the aptamer must be exposed to ribonucleases. To do this, I prepared a library containing RNAs with 2'-Fluoro …
Sirtuin 6 : A Review Of Biological Affects And Potential Therapeutic Properties, Jade Beauharnois
Sirtuin 6 : A Review Of Biological Affects And Potential Therapeutic Properties, Jade Beauharnois
Legacy Theses & Dissertations (2009 - 2024)
ABSTRACT: Sirtuins, possessing either histone deacetylase or mono-ribosyltransferase activity, regulate important biological pathways in bacteria, archaea and eukaryotes. The term Sir2 comes from the yeast 'silent mating-type information regulation 2' gene, a gene directing cellular regulation in yeast. Sirtuins have been implicated in aging, regulation of transcription, apoptosis and stress resistance, in addition to energy efficiency and metabolism. In mammals, a variety of sirtuin family members are genetically encoded to include sirtuins 1-7 (SIRT1-SIRT7). SIRT6 is a human sirtuin of interest in a variety of research areas, influencing the genomic instability, metabolic defects and degenerative pathologies associated with aging. Until …
Structure And Function Of Non-Coding Regulatory Rna Domains, Nakesha L. Smith
Structure And Function Of Non-Coding Regulatory Rna Domains, Nakesha L. Smith
Legacy Theses & Dissertations (2009 - 2024)
Ribonucleic acid (RNA) has been found to be a very versatile molecule, exhibiting countless functions and can act as a catalyst in biochemical reactions. These functions have typically been attributed to the unique structures that it forms. Novel non-coding RNAs capable of regulating gene expression are still being discovered, and the scope of the RNA world is still being uncovered. The structure function relationship of two different types of non-coding RNA has been investigated: riboswitches and sxRNAs. UV-monitored thermal denaturation experiments, Nuclear Magnetic Resonance spectroscopy, native gel electrophoresis and an in vivo luciferase assay were used to investigate the structural …
Mechanism Of Inhibition Of The Glua2 Receptors By N-3 Derivatives Of 2,3-Benzodiazepines With C-4 Methyl Group, Congzhou Wang
Mechanism Of Inhibition Of The Glua2 Receptors By N-3 Derivatives Of 2,3-Benzodiazepines With C-4 Methyl Group, Congzhou Wang
Legacy Theses & Dissertations (2009 - 2024)
α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors are one of the three subtypes of ionotropic glutamate receptors. AMPA receptors mediate fast synaptic neurotransmission in the central nervous system (CNS). Over-activation of calcium permeable AMPA receptors causes intracellular calcium overload, which leads to neurodegeneration and cell death. As such, AMPA receptors have been implicated in a number of neurological disorders and diseases, such as epilepsy, amyotrophic lateral sclerosis (ALS), and Parkinson's disease. 2,3-Benzodiazepine derivatives (or GYKI compounds) are a group of structurally similar compounds synthesized as inhibitors of AMPA receptors, and they have been used as potential drug candidates for the treatment of various …
Interactions Of The Human Immunodeficiency Virus Type 1 Nucleocapsid Protein With Non-Hiv-Derived Nucleic Acids : Implications For The Viral Replication Cycle, Abhijit Padmakar Jadhav
Interactions Of The Human Immunodeficiency Virus Type 1 Nucleocapsid Protein With Non-Hiv-Derived Nucleic Acids : Implications For The Viral Replication Cycle, Abhijit Padmakar Jadhav
Legacy Theses & Dissertations (2009 - 2024)
During attempts to develop aptamers that bind to the nucleocapsid protein of HIV-1 (i.e. NCp7) with high affinity, a heretofore unreported property of the protein--the ability to mediate degradation of nucleic acids, was discovered. Using λ DNA as a model nucleic acid system, it was shown that NCp7-mediated degradation of nucleic acids is non-specific, depends on incubation time, the concentration of NCp7, and the presence of divalent and monovalent cations. It was further demonstrated that degradation can be abrogated if NCp7 is pre-incubated with NCp7-inhibitors. Lyophilization of NCp7 can induce irreversible changes in its secondary structure that result in loss …
Dna Repair Fidelity And Cancer : Structural And Kinetic Insights From Dna Polymerase Beta Mutator Variants, Chelsea Lynne Gridley
Dna Repair Fidelity And Cancer : Structural And Kinetic Insights From Dna Polymerase Beta Mutator Variants, Chelsea Lynne Gridley
Legacy Theses & Dissertations (2009 - 2024)
DNA polymerases are essential for genome replication and DNA repair in all living organisms. Precise DNA replication is critical for the preservation of genomic stability. Any insult, endogenous/exogenous, to cellular DNA requires properly functioning repair polymerases. In eukaryotes, DNA polymerase beta, a small enzyme (39 kDa), plays an important role in DNA repair during the base excision repair pathway. Pol beta catalyzes the incorporation of nucleotides in small stretches (1-6 nucleotides) of damaged double-stranded DNA. Should gap-filling synthesis by pol beta be compromised, mutations in genomic DNA accumulate, which are frequently linked to human diseases, including cancers. For this reason, …
Amyloid Fibril Polymorphism : Structure, Supramolecular Chiraliy And Spontaneous Interconversion, Dzmitry Kurouski
Amyloid Fibril Polymorphism : Structure, Supramolecular Chiraliy And Spontaneous Interconversion, Dzmitry Kurouski
Legacy Theses & Dissertations (2009 - 2024)
Specific protein aggregation has been linked to more than 25 severe human maladies including prion, Alzheimer's, and Parkinson's diseases. These important malfunctions are often referred to as 'conformational' disorders and result from the conversion of a normal isoform of a protein into a specific b-sheet rich polymeric amyloid form. This work elaborates a comprehensive characterization of amyloids and dedicated to the investigation of the fibril polymorphism using advanced microscopic tools, such as Atomic Force and Scanning Electron microcopies, together with several vibrational spectroscopy techniques, such as Raman, Infrared and Vibrational Circular Dichroism. A new type of protein folding-aggregation phenomenon, spontaneous …
Single Cell Analysis For The Characterization Of Cell Populations Using A Live Cell Array, Maureen Ann Walling
Single Cell Analysis For The Characterization Of Cell Populations Using A Live Cell Array, Maureen Ann Walling
Legacy Theses & Dissertations (2009 - 2024)
In the past decade, the shift from whole cell population analyses towards single cell measurement methods and techniques is based on experimental results that reveal significant levels of non-genetic heterogeneity in clonal cell populations. This heterogeneity manifests in multiple aspects of cell activity and is, in part, a result of stochastic noise in processes leading to gene expression, namely transcription and translation. The growing understanding of this occurrence has led to the development of methods to monitor and analyze heterogeneity for a more thorough description of cell populations and overall activity.
Structural Interactions And Dynamics Of Disease Related Proteins By Using Nmr Spectroscopy, Shadakshara Swamy Puttamadappa
Structural Interactions And Dynamics Of Disease Related Proteins By Using Nmr Spectroscopy, Shadakshara Swamy Puttamadappa
Legacy Theses & Dissertations (2009 - 2024)
Nuclear Magnetic Resonance (NMR) is a powerful spectroscopic technique to study the structure, molecular interactions, and dynamics of proteins. Modern NMR instrumentation, advancements in experimental techniques and revolutionary developments in recombinant DNA technology have made NMR a versatile and very convenient tool for biomolecule characterization.