Strategies to Increase Robustness in the Optimization and CMC Production of Peptide Therapeutics with Parallel Peptide Synthesis

Recorded Webcast from TIDES 2018 Digital Week

With the advancement of personalized medicine and newer disease targets, peptide therapeutic development has greatly expanded. Its potential to achieve increased receptor specificity and decreased toxicity satisfies efficacy and safety regulatory requirements. Technology advances in automated SPPS enable screening and CMC production of peptides with greater structural complexity allows for the design of more physiologically stable products with increased target specificity and membrane permeability. Structural modification strategies for peptide lead optimization can include cyclization, stapling, and PEGylation, which can be difficult to synthesize and purify, requiring more efficient synthesis protocols and automation to ensure reproducible and efficient manufacturability. 

Here we describe the process development and parallel optimization of SPPS relating to different biologically relevant peptides. Solid-support screening, reagent screening and temperature screening are demonstrated using an automated peptide synthesizer as part of the optimization process for difficult peptides such as Aib-Enkephalin (90% optimized crude purity vs 21% crude purity) and JR 10-mer (67% optimized crude purity vs 21% crude purity). In addition, the synthesis optimization in parallel of GLP-1 related peptides and dual GLP-1/glucagon receptor agonists will be shown, testing multiple resins and coupling reagents in search of optimal crude purities that may translate into ease of purification during the manufacturing process. Finally, the fully automated synthesis, from linear, on-resin cyclization, and resin cleavage, of NYAD-1 stapled peptide will be shared.

James Cain, Global Product Manager, Gyros Protein Technologies

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Strategies for efficient, high throughput optimization of biopolymers and mimetic compounds

Peptide, peptidomimetic and oligonucleotide therapeutics are increasingly at the forefront of drug development programs for personalized medicine, cancer therapeutics, and genetic diseases among others. This has driven the search for faster and more efficient solid phase synthesis (SPS) protocols, making method development crucial in the discovery process towards scale-up. Automated synthesizers are part of the SPS toolbox that allows simultaneous optimization and high-throughput synthesis via parallel synthesis.

In this webinar, we describe the process development and parallel optimization of SPS of different biologically relevant compounds. Solid-support screening and reagent screening are demonstrated using automated peptide synthesis as part of the optimization process for peptide nucleic acids (PNA), peptoids, and cyclic peptides. For example, parallel synthesis condition scanning for the synthesis of SK-8mer PNA analog, H-Lys-AGTGGATC-Lys-NH2, led to an increase of 27% crude purity resulting in high purity product (73% crude pure) for biological analysis. Coupling reagents, resins and reaction time combinations for increased crude purity results will be discussed for biopolymers and mimetic compounds.

James Cain, Global Product Manager, Gyros Protein Technologies
Cyf Ramos-Colón, Senior Scientist, Peptide Applications, Gyros Protein Technologies

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Cell Penetration Profiling using the Chloroalkane Penetration Assay for Peptides, Proteins and Nucleic Acids

Biotechnology promises the ability to control biology and disease with laser-like precision, but biomolecules typically have poor cell penetration and unpredictable subcellular localization. Hundreds of peptides, proteins and nucleic acids are being developed as diagnostics and therapies. For many of these, intracellular delivery remains the primary obstacle. Currently, there are no quantitative, high-throughput tools to measure how much of a biomolecule enters a cell and where it distributes within the cell. Importantly, most widely-used methods for measuring cell penetration cannot rule out effects of material at the cell surface or trapped in endosomes.
We have devised a chloroalkane penetration assay (CAPA) that exclusively measures penetration to the cytoplasm. CAPA uses a cell line with stably expressed HaloTag in the cytoplasm, and measures the extent of covalent reaction between this enzyme and a small chloroalkane tag appended to the molecule of interest.

Joshua Kritzer
Associate Professor
Department of Chemistry
Tufts University

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Chemical, Computational, and Instrumental Tools for Challenging Peptide Syntheses

The Kay lab at the University of Utah is focused on D-peptide inhibitor development, which requires the chemical synthesis of mirror-image protein targets. Mirror-image proteins are not found in nature and are promising therapeutic agents due to their resistance to degradation by natural proteases. This webinar will describe the use of chemical, instrumental, and computational tools to overcome challenges associated with the chemical synthesis of large proteins via Fmoc solid-phase peptide synthesis and native chemical ligation. Specific examples will include the use of a reversible solubilizing tag (“helping hand”), pseudoproline dipeptides, UV monitoring, and an automated ligator program (“Aligator”) to predict the most efficient synthesis schemes.

Michael S Kay MD/PhD
Biochemistry, University of Utah

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