Netrin-3 And Netrin-4-Like Proteins Are Secreted From Tetrahymena Thermophila, 2019 Cedarville University
Netrin-3 And Netrin-4-Like Proteins Are Secreted From Tetrahymena Thermophila, Leah C. Anderton, Nicholas Bradley, Sorrel Paris, Aaron T. Vangeest, Reese Watkins, Kassie E. Young, Heather G. Kuruvilla
The Research and Scholarship Symposium
Netrins are signaling proteins, acting as chemorepellants or chemoattractants, and their role is especially important in early growth in organisms. In studies involving Tetrahymena thermophila, netrin proteins often act as chemorepellants, so research centered around verifying if this was also true for Netrin-4 protein. Since Netrin-1 and Netrin-3 have been shown to influence neurological and developmental growth in organisms, the implications for discovering the cellular effects of Netrin-4 are significant for human health and research. Through behavioral assays, we were able to confirm that Netrin4 does act as a chemorepellant. In addition, our ELISA and Western blots also helped substantiate ...
Characterization Of A Netrin-4 Like Protein In Tetrahymena Thermophila, 2019 Cedarville University
Characterization Of A Netrin-4 Like Protein In Tetrahymena Thermophila, Leah Anderton, Nicholas Bradley, Bryce Childers, Levi Fox, Kirstyn Kelley, Lauren Lightbody, Allison Mcclean, Estelle Viaud-Murat, Lydia Watson, Heather G. Kuruvilla
The Research and Scholarship Symposium
The netrin family of proteins has homeostatic roles in vertebrate development and angiogenesis, and pathophysiological roles in the progression and metastasis of cancer. We have previously characterized a netrin-1-like protein in Tetrahymena thermophila, and have shown that vertebrate netrin-1, netrin-3, and netrin-4 all serve as chemorepellents in this organism. We are currently using Western blotting and immunofluorescence to further characterize the netrin-like proteins in Tetrahymena. Western blotting with our anti-netrin-4 antibody shows a band that is clearly visible in whole cell extract, but shows little reactivity with secreted protein, indicating that most of our netrin-4-like protein remains within the cell ...
Synthesis Of An Ideal Inhibitor For The Lpxc Enzyme, 2019 Andrews University
Synthesis Of An Ideal Inhibitor For The Lpxc Enzyme, Taejun Lee
Due to the growing need of antibiotics in modern day medicine, this study attempts to apply a method of medicinal chemistry that would create a novel inhibitor for a lesser known target of gram negative bacteria, the LpxC enzyme. This study proposes that a synthetic plan which consists of combining components of different molecules would create a more effective inhibitor. These components include a binding group for the active site of the enzyme, a hydrophobic chain which has been shown to interact with an allosteric site on the LpxC enzyme, and the isoxazoline ring which interacts with the zinc ion ...
Transfer Rna Genes Affect Chromosome Structure And Function Via Local Effects, 2019 University of California, Santa Cruz
Transfer Rna Genes Affect Chromosome Structure And Function Via Local Effects, Omar Hamdani, Tsung-Han S. Hsieh, Oliver J. Rando, Rohinton T. Kamakaka
Open Access Articles
The genome is packaged and organized in an ordered, non-random manner and specific chromatin segments contact nuclear substructures to mediate this organization. Transfer RNA genes (tDNAs) are binding sites for transcription factors and architectural proteins and are thought to play an important role in the organization of the genome. In this study, we investigate the role of tDNAs in genomic organization and chromosome function by editing a chromosome so that it lacks any tDNAs. Surprisingly our analyses of this tDNA-less chromosome show that loss of tDNAs does not grossly affect chromatin architecture or chromosome tethering and mobility. However, loss of ...
Characterizing Aft1/2-Grx3/4 Interaction And The Role Of Bol2 During Iron Regulation In Saccharomyces Cerevisiae, 2019 University of South Carolina - Columbia
Characterizing Aft1/2-Grx3/4 Interaction And The Role Of Bol2 During Iron Regulation In Saccharomyces Cerevisiae, William Rivers
Iron dysregulation has been linked to a variety of human diseases, such as anemia, Friedreich’s ataxia, X-linked sideroblastic anemia, sideroblastic-like microcytic anemia, and myopathy. Thus, it is vitally important to understand the mechanisms for regulating intracellular iron. Here, we use fluorescence microscopy techniques in live cells to study interactions of the yeast proteins Grx3/4, Aft1/2, and Bol2, which have been shown to be involved in turning off iron import when the cell has adequate iron. Modified versions of genes encoding these proteins have been incorporated into several yeast backgrounds to use fluorescence to monitor interactions under varying ...
The Mechanism Of The Enzymatic Synthesis Of 2,4-Hydroxymethfufural Phosphate, 2019 University of North Georgia
The Mechanism Of The Enzymatic Synthesis Of 2,4-Hydroxymethfufural Phosphate, Caroline Brown
This project stems from the desire to explore and eventually harness the enzymatic mechanism of 4-(hydroxymethyl)-2-furan-carboxaldehyde-phosphate synthase (MfnB). The enzyme of interest, MfnB, is found most prominently in methanogens and some bacteria and can catalyze five or more separate chemical transformations in a single active site. This singular enzyme takes two molecules of glyceraldehyde-3-phosphate and creates a furan-containing compound, 4- (hydroxymethyl)-2-furan-carboxaldehyde-phosphate (4-HMF-P). Furan-containing compounds have been highlighted for their high potential in the production of biofuels and biomaterial compounds; thus, research efforts seek to create a more efficient synthesis process for furan compounds. The broad industrial applications ...
Determining The Key Residues For Capsule Production In The Gbs Cpsa Protein, 2019 University of Maine
Determining The Key Residues For Capsule Production In The Gbs Cpsa Protein, Anna Struba
Streptococcus agalactiae (GBS) is a common bacterium found commensally in the vaginal mucosa of healthy adults. GBS also causes severe infection in neonates, often leading to meningitis, which can cause lifelong health consequences including impaired hearing and seizures. Infection of newborns mainly arises from a colonized mother, either before birth through ascending infection or during labor. Ascending infection, where the bacteria travel to the fetus from the vaginal mucosa, is especially concerning as it can lead to loss of pregnancy or premature birth. The most common method of neonatal GBS disease prevention is antibiotic prophylaxis during delivery, though this method ...
Characterization Of Psychromonas Aquimarina, A New Model Organism For Climate Change, 2019 Harrisburg University of Science and Technology
Characterization Of Psychromonas Aquimarina, A New Model Organism For Climate Change, Carrie Carpenter
Experiential Learning Projects
The current increase of average global temperature puts 25 to 35 percent of plant and animal species at an increased risk of extinction (Climate Change, 2018). Changing any environmental factor, such as increasing growth temperature, can significantly impact any organisms’ ability to survive. Because of the diversity of organisms on the planet, it is not feasible to study how each individually might adapt, but rather it is more efficient to study select organisms. This research focuses on a psychrophilic bacterium, Psychromonas aquimarina, which can survive in colder regions where most bacteria would not. This bacterium was chosen because climate change ...
Study Of The Effects Of Silver Ions And Silver Nanoparticles On Embryonic Development, 2019 Old Dominion University
Study Of The Effects Of Silver Ions And Silver Nanoparticles On Embryonic Development, Martha Sharisha Johnson
Biomedical Sciences Theses & Dissertations
This dissertation focuses on the study of the toxicity of metal nanoparticles (NPs) and their ions on the development of zebrafish embryos, aiming to understand unique biological effects of NPs and ions, and design new in vivo assays to characterize the toxicity of these metal NPs and metal ions. Currently, the underlying molecular mechanisms of biological effects of nanomaterials are partially understood. Some studies assume that the toxic effects of NPs can be attributed to the release of their ions. We investigate the effects of silver NPs (Ag NPs) and silver ions (Ag+ ions) on the embryonic development of zebrafish ...
Ultrafine Carbon Nanoparticles Activate Inflammasome Signaling And Cell Death In Murine Macrophages, 2019 Pepperdine University
Ultrafine Carbon Nanoparticles Activate Inflammasome Signaling And Cell Death In Murine Macrophages, Alexander Soloniuk, Hadley Lamascus, Jay Brewster, John Mann
Seaver College Research And Scholarly Achievement Symposium
Carbon black (CB) is the primary nanoparticulate component of air pollution from fossil fuel combustion. This work examines the cellular impact of ultrafine carbon (carbon black, CB) nanoparticles, that range in size down to 30 nm, upon murine macrophages. The size analysis of the carbon black nanoparticles was performed using atomic force microscopy (AFM) and transmission electron microscopy (TEM) techniques. RAW246.7 macrophage cells were exposed to CB doses ranging from 50 – 200 ug/ml in complete media. Analysis of cell survival over time revealed elevated rates of significant nuclear degradation and cell lifting after 48 hours of exposure, and ...
Optical Stability Of 1,1′-Binaphthyl Derivatives, 2019 Utah State University
Optical Stability Of 1,1′-Binaphthyl Derivatives, Nikolay V. Tkachenko, Steve Scheiner
Chemistry and Biochemistry Faculty Publications
The racemization process of various 1,1′-binaphthyl derivatives is studied by quantum calculations. The preferred racemization pathway passes through a transition state belonging to the Ci symmetry group. The energy barrier for this process is independent of solvation, the electron-withdrawing/releasing power of substituents, or their ability to engage in H-bonds within the molecule. The primary factor is instead the substituent size. The barrier is thus reduced when the −OH groups of 1,1′-bi-2-naphthol are replaced by H. There is a drop in the barrier also when the substituents are moved from the 2,2′ positions to ...
Mass Spectrometry-Based Proteomics Analysis Of Bioactive Proteins In Emd That Modulate Adhesion Of Gingival Fibroblast To Improve Bio-Integration Of Dental Implants, 2019 The University of Western Ontario
Mass Spectrometry-Based Proteomics Analysis Of Bioactive Proteins In Emd That Modulate Adhesion Of Gingival Fibroblast To Improve Bio-Integration Of Dental Implants, David Zuanazzi Machado Jr
Electronic Thesis and Dissertation Repository
Titanium implants are used in dental practice to replace damaged or lost teeth. The implant needs to integrate with the surrounding gingiva to protect it against bacterial invasion that leads to implant loss. The biointegration is dependent on the implant surface that interacts with proteins from biological fluids to modulate tissues response. Tailoring the surface with specific proteins from the enamel matrix derivative (EMD) would be beneficial to improve the implant-gingiva interface since EMD can affect various cells including gingival fibroblasts. A surface-affinity approach using three different titanium surfaces and saliva was utilized as a model in combination with tandem ...
Promoter Library Designed For Fine-Tuned Gene Expression In Pichia Pastoris, 2019 Graz University of Technology
Promoter Library Designed For Fine-Tuned Gene Expression In Pichia Pastoris, Franz S. Hartner, Claudia Ruth, David Langenegger, Sabrina N. Johnson, Petr Hyka, Geoff P. Lin-Cereghino, Joan Lin-Cereghino, Karin Kovar, James Cregg, Anton Glieder
Although frequently used as protein production host, there is only a limited set of promoters available to drive the expression of recombinant proteins in Pichia pastoris. Fine-tuning of gene expression is often needed to maximize product yield and quality. However, for efficient knowledge-based engineering, a better understanding of promoter function is indispensable. Consequently, we created a promoter library by deletion and duplication of putative transcription factor-binding sites within the AOX1 promoter (PAOX1) sequence. This first library initially spanned an activity range between ∼6% and >160% of the wild-type promoter activity. After characterization of the promoter library employing a green ...
Condensed Protocol For Competent Cell Preparation And Transformation Of The Methylotrophic Yeast Pichia Pastoris, 2019 University of the Pacific
Condensed Protocol For Competent Cell Preparation And Transformation Of The Methylotrophic Yeast Pichia Pastoris, Joan Lin-Cereghino, William Wong, See Xiong, William Giang, Linda Luong, Jane Vu, Sabrina Johnson, Geoff P. Lin-Cereghino
No abstract provided.
Endosome To Golgi Retrieval Of The Vacuolar Protein Sorting Receptor, Vps10p, Requires The Function Of The Vps29, Vps30, And Vps35 Gene Products, 2019 University of California, San Diego
Endosome To Golgi Retrieval Of The Vacuolar Protein Sorting Receptor, Vps10p, Requires The Function Of The Vps29, Vps30, And Vps35 Gene Products, Matthew N. J. Seaman, Eric G. Marcusson, Joan Lin-Cereghino, Scott D. Emr
Mutations in the S. cerevisiae VPS29 and VPS30 genes lead to a selective protein sorting defect in which the vacuolar protein carboxypeptidase Y (CPY) is missorted and secreted from the cell, while other soluble vacuolar hydrolases like proteinase A (PrA) are delivered to the vacuole. This phenotype is similar to that seen in cells with mutations in the previously characterized VPS10 and VPS35 genes. Vps10p is a late Golgi transmembrane protein that acts as the sorting receptor for soluble vacuolar hydrolases like CPY and PrA, while Vps35p is a peripheral membrane protein which cofractionates with membranes enriched in Vps10p. The ...
Measuring The Reproducibility And Quality Of Hi-C Data, 2019 University of Washington
Measuring The Reproducibility And Quality Of Hi-C Data, Galip Gurkan Yardimci, Hakan Ozadam, Bryan R. Lajoie, Ye Zhan, Job Dekker, William S. Noble
Open Access Articles
BACKGROUND: Hi-C is currently the most widely used assay to investigate the 3D organization of the genome and to study its role in gene regulation, DNA replication, and disease. However, Hi-C experiments are costly to perform and involve multiple complex experimental steps; thus, accurate methods for measuring the quality and reproducibility of Hi-C data are essential to determine whether the output should be used further in a study.
RESULTS: Using real and simulated data, we profile the performance of several recently proposed methods for assessing reproducibility of population Hi-C data, including HiCRep, GenomeDISCO, HiC-Spector, and QuASAR-Rep. By explicitly controlling noise ...
Optimization Of Ribosome Profiling Using Low-Input Brain Tissue From Fragile X Syndrome Model Mice, 2019 University of Massachusetts Medical School
Optimization Of Ribosome Profiling Using Low-Input Brain Tissue From Fragile X Syndrome Model Mice, Botao Liu, Gemma Molinaro, Huan Shu, Emily E. Stackpole, Kimberly M. Huber, Joel D. Richter
Open Access Articles
Dysregulated protein synthesis is a major underlying cause of many neurodevelopmental diseases including fragile X syndrome. In order to capture subtle but biologically significant differences in translation in these disorders, a robust technique is required. One powerful tool to study translational control is ribosome profiling, which is based on deep sequencing of mRNA fragments protected from ribonuclease (RNase) digestion by ribosomes. However, this approach has been mainly applied to rapidly dividing cells where translation is active and large amounts of starting material are readily available. The application of ribosome profiling to low-input brain tissue where translation is modest and gene ...
Unified Methods For Feature Selection In Large-Scale Genomic Studies With Censored Survival Outcomes, Lauren Spirko-Burns, Karthik Devarajan
COBRA Preprint Series
One of the major goals in large-scale genomic studies is to identify genes with a prognostic impact on time-to-event outcomes which provide insight into the disease's process. With rapid developments in high-throughput genomic technologies in the past two decades, the scientific community is able to monitor the expression levels of tens of thousands of genes and proteins resulting in enormous data sets where the number of genomic features is far greater than the number of subjects. Methods based on univariate Cox regression are often used to select genomic features related to survival outcome; however, the Cox model assumes proportional ...
An Automated Bayesian Pipeline For Rapid Analysis Of Single-Molecule Binding Data, 2019 University of Massachusetts Medical School
An Automated Bayesian Pipeline For Rapid Analysis Of Single-Molecule Binding Data, Carlas Smith, Karina Jouravleva, Maximiliaan Huisman, Samson M. Jolly, Phillip D. Zamore, David Grünwald
Single-molecule binding assays enable the study of how molecular machines assemble and function. Current algorithms can identify and locate individual molecules, but require tedious manual validation of each spot. Moreover, no solution for high-throughput analysis of single-molecule binding data exists. Here, we describe an automated pipeline to analyze single-molecule data over a wide range of experimental conditions. In addition, our method enables state estimation on multivariate Gaussian signals. We validate our approach using simulated data, and benchmark the pipeline by measuring the binding properties of the well-studied, DNA-guided DNA endonuclease, TtAgo, an Argonaute protein from the Eubacterium Thermus thermophilus. We ...
Genome-Wide Prediction Of Synthetic Rescue Mediators Of Resistance To Targeted And Immunotherapy, 2019 Harvard Medical School
Genome-Wide Prediction Of Synthetic Rescue Mediators Of Resistance To Targeted And Immunotherapy, Avinash Das Sahu, Olga Ponomarova, Eytan Ruppin
Open Access Articles
Most patients with advanced cancer eventually acquire resistance to targeted therapies, spurring extensive efforts to identify molecular events mediating therapy resistance. Many of these events involve synthetic rescue (SR) interactions, where the reduction in cancer cell viability caused by targeted gene inactivation is rescued by an adaptive alteration of another gene (the rescuer). Here, we perform a genome-wide in silico prediction of SR rescuer genes by analyzing tumor transcriptomics and survival data of 10,000 TCGA cancer patients. Predicted SR interactions are validated in new experimental screens. We show that SR interactions can successfully predict cancer patients' response and emerging ...