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Articles 1 - 7 of 7
Full-Text Articles in Life Sciences
Minimalistic Peptide-Based Supramolecular Systems Relevant To The Chemical Origin Of Life, Daniela Kroiss
Minimalistic Peptide-Based Supramolecular Systems Relevant To The Chemical Origin Of Life, Daniela Kroiss
Dissertations, Theses, and Capstone Projects
All forms of life are based on biopolymers, which are made up of a selection of simple building blocks, such as amino acids, nucleotides, fatty acids and sugars. Their individual properties govern their interactions, giving rise to complex supramolecular structures with highly specialized functionality, including ligand recognition, catalysis and compartmentalization. In this thesis, we aim to answer the question whether short peptides could have acted as precursors of modern proteins during prebiotic evolution. Using a combination of experimental and computational techniques, we screened a large molecular search space for peptide sequences that are capable of forming supramolecular complexes with adenosine …
Amphiphilic Peptides For Efficient Sirna Delivery, Saghar Mozaffari, Emira Bousoik, Farideh Amirrad, Robert Lamboy, Melissa Coyle, Ryley Hall, Abdulaziz Alasmari, Parvin Mahdipoor, Keykavous Parang, Hamidreza Montazeri Aliabadi
Amphiphilic Peptides For Efficient Sirna Delivery, Saghar Mozaffari, Emira Bousoik, Farideh Amirrad, Robert Lamboy, Melissa Coyle, Ryley Hall, Abdulaziz Alasmari, Parvin Mahdipoor, Keykavous Parang, Hamidreza Montazeri Aliabadi
Pharmacy Faculty Articles and Research
A number of amphiphilic cyclic peptides—[FR]4, [WR]5, and [WK]5—containing hydrophobic and positively-charged amino acids were synthesized by Fmoc/tBu solid-phase peptide methods and evaluated for their efficiency in intracellular delivery of siRNA to triple-negative breast cancer cell lines, MDA-MB-231 and MDA-MB-468, in the presence and absence of 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE). Among the peptides, [WR]5, which contains alternate tryptophan (W) and arginine (R) residues, was found to be the most efficient in the delivery of siRNA by improving the delivery by more than 3-fold when compared to other synthesized cyclic peptides that were not efficient. The data also showed that co-formulation of [WR]5 …
Computational Modelling Of Peptides Containing Non-Standard Amino Acids, David W. Kastner
Computational Modelling Of Peptides Containing Non-Standard Amino Acids, David W. Kastner
Undergraduate Honors Theses
Peptides represent a class of abundant and potent pharmaceutic compounds. Despite their appeal, the design, synthesis, and engineering of biologically relevant peptides remain a challenge. Chapter 1 introduces the various computational methods that will be used. Chapter 2 focuses on the incorporation of a special class of amino acids called bulky dehydroamino acids into the turn of β-hairpins to proteolytically stabilize peptides. Our results suggest that dehydroamino acids confer proteolytic stability by favoring a more folded state. Chapter 3 describes the structural calculations of a rare anticancer peptide called Yaku’amide using a combined molecular mechanics/quantum mechanics hybrid method. The …
Bisthioether Stapled Peptides Targeting Polycomb Repressive Complex 2 Gene Repression, Gan Zhang
Bisthioether Stapled Peptides Targeting Polycomb Repressive Complex 2 Gene Repression, Gan Zhang
Dissertations, Theses, and Capstone Projects
Interactions between proteins play a key role in nearly all cellular process, and therefore, disruption of such interactions may lead to many different types of cellular dysfunctions. Hence, pathologic protein-protein interactions (PPIs) constitute highly attractive drug targets and hold great potential for developing novel therapeutic agents for the treatment of incurable human diseases. Unfortunately, the identification of PPI inhibitors is an extremely challenging task, since traditionally used small molecule ligands are mostly unable to cover and anchor on the extensive flat surfaces that define those binary protein complexes. In contrast, large biomolecules such as proteins or peptides are ideal fits …
A Tandem Mass Spectrometry Sequence Database Search Method For Identification Of O-Fucosylated Proteins By Mass Spectrometry., Kristian E Swearingen, Jimmy K Eng, David Shteynberg, Vladimir Vigdorovich, Timothy A Springer, Luis Mendoza, D Noah Sather, Eric W Deutsch, Stefan H I Kappe, Robert L Moritz
A Tandem Mass Spectrometry Sequence Database Search Method For Identification Of O-Fucosylated Proteins By Mass Spectrometry., Kristian E Swearingen, Jimmy K Eng, David Shteynberg, Vladimir Vigdorovich, Timothy A Springer, Luis Mendoza, D Noah Sather, Eric W Deutsch, Stefan H I Kappe, Robert L Moritz
Articles, Abstracts, and Reports
Thrombospondin type 1 repeats (TSRs), small adhesive protein domains with a wide range of functions, are usually modified with O-linked fucose, which may be extended to O-fucose-β1,3-glucose. Collision-induced dissociation (CID) spectra of O-fucosylated peptides cannot be sequenced by standard tandem mass spectrometry (MS/MS) sequence database search engines because O-linked glycans are highly labile in the gas phase and are effectively absent from the CID peptide fragment spectra, resulting in a large mass error. Electron transfer dissociation (ETD) preserves O-linked glycans on peptide fragments, but only a subset of tryptic peptides with low m/ z can be reliably sequenced from ETD …
A Rational Approach For Creating Peptides Mimicking Antibody Binding, Sameer Sachdeva, Hyun Joo, Jerry Tsai, Bhaskara Jasti, Xiaoling Li
A Rational Approach For Creating Peptides Mimicking Antibody Binding, Sameer Sachdeva, Hyun Joo, Jerry Tsai, Bhaskara Jasti, Xiaoling Li
School of Pharmacy Faculty Articles
This study reports a novel method to design peptides that mimic antibody binding. Using the Knob-Socket model for protein-protein interaction, the interaction surface between Cetuximab and EGFR was mapped. EGFR binding peptides were designed based on geometry and the probability of the mapped knob-sockets pairs. Designed peptides were synthesized and then characterized for binding specificity, affinity, cytotoxicity of drug-peptide conjugate and inhibition of phosphorylation. In cell culture studies, designed peptides specifically bind and internalize to EGFR overexpressing cells with three to four-fold higher uptake compared to control cells that do not overexpress EGFR. The designed peptide, Pep11, bound to EGFR …
Effects Of Commercial Feed Additives On The Gut Microbiota Of Food Animals, Prakash Poudel
Effects Of Commercial Feed Additives On The Gut Microbiota Of Food Animals, Prakash Poudel
Electronic Theses and Dissertations
Weaning is a stressful event of newborn animals which can lead to dysbiosis in the GIT causing invasion of pathogens, retarded growth, high incidence of diarrhea, and increased neonatal mortality. Since antibiotics use in livestock production have been regulated, various feed additives have been designed as antibiotic alternatives to use in newborn animal during weaning. This thesis investigated the dynamics of bacterial composition of GIT in weaned animals fed commercial feed additives by analysis of high throughput sequencing data generated from PCR-amplified DNA targeting V1-V3 region of 16S rRNA gene. Experiment 1 investigated the rumen environment of neonatal calves fed …