Cambridge Healthtech Instituteの第18回年次
GPCR-Based Drug Discovery
Registration and Morning Coffee7:00 am
Welcome Remarks7:55 am
GPCR STRUCTURE-BASED AND BEYOND APPROACHES: AI, CRYO-EM, AND MORE
FEATURED PRESENTATION: Structural Characterization of an Orphan GPCR Reveals a Novel Mechanism of Inverse Agonism
Seungil Han, PhD, Research Fellow, Head of cryo-EM Lab, Structural Biology & Molecular Sciences, Pfizer Inc.
We report the first activated-state structure of an orphan receptor in complex with its heterotrimeric G protein, determined by cryo-EM. This information provides insights into the structural basis of its constitutive activity. We have also successfully stabilized the receptor in its inactive state and we report its structural co-elucidation with a newly discovered potent and selective small-molecule inverse agonist.
Computer-Driven Discovery of GPCR Ligands with New Chemotypes and Functional Selectivity
Vsevolod "Seva" Katritch, PhD, Associate Professor, Quantitative and Computational Biology and Chemistry, University of Southern California
In the last few years, GPCR drug discovery has been transformed by the rapidly growing availability of 3D structures, better understanding of the atomistic mechanisms of signaling, and the development of giga-scale virtual spaces of drug-like compounds. This talk will describe two complementary computer-driven approaches to structure-based drug discovery of new GPCRs ligand chemotypes and new functionally-selective derivatives of known scaffolds.
Supercharging GPCR Drug Discovery with AI/ML
Ajay S. Yekkirala, PhD, Co-Founder and Head of Biology, Superluminal Medicine
I present application of our fully-integrated proprietary R&D platform that enabled us, in 4 months, to move from structure prediction to in silico screening of a 10B molecule library, ending with biologically validated biased agonists for a POC GPCR. Our platform combines extensive pharmacological assay capabilities with ML (discussed by Victor Guallar in AI track) to determine protein conformations, gigadock ultra-large libraries in hours, and an ADMET-filter to assess druggability.
Networking Coffee Break9:35 am
Driving GPCR Drug Discovery with GPCR Native Complexes
Jeffrey T. Finer, MD, PhD, CEO & Co-Founder, Septerna
Septerna’s Native Complex Platform reconstitutes purified GPCRs, G proteins, and ligands into modular assemblies which retain their native structure, function, and dynamics. The GPCR Native Complexes are being utilized to unlock previously difficult-to-drug GPCRs through rapid iterative structure-based drug design and new paradigms for drug screening (including DNA-encoded library screens) for the discovery of a spectrum of therapeutic candidates with disease-relevant mechanisms-of-action including agonists, antagonists, and allosteric modulators.
Development of Generic G Protein Peptidomimetics Able to Stabilize Active State G Protein-Coupled Receptors
Steven Ballet, PhD, Professor, Research Group of Organic Chemistry, Bioengineering Sciences & Chemistry, Vrije University Brussels
GPCRs represent an important group of membrane proteins that play a central role in modern medicine. Unfortunately, conformational promiscuity hampers full therapeutic exploitation of GPCRs, since the largest population of the receptor will adopt a basal conformation, which subsequently challenges screens for agonist drug discovery programs. Herein, we describe a set of peptidomimetics able to mimic the ability of G proteins in stabilizing the active state of Gs- and Gq-mediated receptors. We were able to identify agonism pre-imprinted fragments for the examined GPCRs, and as such, they behave as a generic tool, enabling an engagement in agonist earmarked discovery programs.
Application of 19F-qNMR in Trapping GPCR Intermediate-States for Biased Drug Evaluation
Libin Ye, PhD, Assistant Professor, Molecular Biosciences, University of South Florida
With the guide of 19F NMR, we demonstrate the feasibility of enriching the populations of discrete states via a series of conformational-biased mutants. These mutants adopt distinct distributions among five states from inactive, intermediate, to the fully active states that lie along the activation pathway of adenosine A2AR receptor. Our study further indicates that the mutants present bias distinction on downstream signaling partners, implying their applications in biased drug development.
Sponsored Presentation (Opportunity Available)11:35 am
Transition to Lunch12:05 pm
Luncheon Presentation (Sponsorship Opportunity Available) or Enjoy Lunch on Your Own12:10 pm
Session Break12:40 pm
Oral CCR4 Antagonist RPT193 for Treatment of Allergic Disorders
Mikhail Zibinsky, PhD, Director, Chemistry, RAPT Therapeutics
Antagonism of CCR4 is currently being investigated by RAPT as potential treatment for allergic disorders mediated by Th2 driven inflammation. RPT193 can effectively inhibit CCR4-mediated Th2 chemotaxis and has successfully completed Phase I clinical trials where it has demonstrated good exposure and receptor occupancy after oral dosing and has shown evidence of efficacy in a Phase 1B trial in atopic dermatitis patients. The drug is currently in Phase II clinical studies for atopic dermatitis and asthma.
Discovery of Novel 5-HT2A Receptor Agonists Utilizing AI-Assisted Design for the Potential Treatment of Major Depressive Disorder
Glenn F. Short, PhD, Senior Vice President, Early Development, ATAI Life Sciences AG
Psilocybin activates the 5-HT2A receptor to induce psychedelic subjective effects in humans and has shown antidepressant efficacy after a single administration. This presentation will highlight the use of an artificial intelligence (AI)-assisted/structure-based drug design approach to generate novel 5-HT2A agonists that mimic the polypharmacology of psilocin, the active metabolite of psilocybin, and promote both pharmacological and behavioral effects in animals consistent with antidepressant-like activity.
Sponsored Presentation (Opportunity Available)2:20 pm
In-Person Group Discussions2:50 pm
Grand Opening Refreshment Break in the Exhibit Hall with Poster Viewing3:35 pm
Targeting of Ectopically Expressed Olfactory Receptor OR51E1: Implications for the Druggability of the OR Family of GPCRs
Vladlen Z. Slepak, PhD, Professor, Molecular & Cellular Pharmacology, University of Miami
Olfactory receptors (ORs) were initially discovered in the nasal epithelium but have since been found in various other tissues. However, due to unique technical challenges in expressing functionally active ORs in vitro, they have remained understudied and underutilized. Considering that ORs make up 50% of the human GPCR-ome, they present an enticing drug target. In the course of our studies, we established an effective cell-based high-throughput screening (HTS) system and several orthogonal assays. This enabled us to identify new agonists and antagonists for OR51E1, an evolutionarily conserved OR associated with prostate cancer and the regulation of blood pressure.
Presentation to be Announced5:15 pm
Welcome Reception in the Exhibit Hall with Poster Viewing5:45 pm
Close of Day6:45 pm
Registration and Morning Coffee7:30 am
GPCR COMPLEXES AND COMPLEXITIES
GPCR Ubiquitination and Implications for Drug Discovery
Christine L. Lavoie, PhD, Professor, Pharmacology & Physiology, University of Sherbrooke
Although gas structure has been known for years, we found a novel motif in gas that allows its interaction with ubiquitin, a key signal for receptor sorting to the degradation pathway. We also recently identified specific ubiquitination sites on gas that regulate its activity. This presentation will cover our recent data that bring to light a novel ubiquitin-based regulation of gas impacting GPCR signaling and trafficking for the fine-tuning of the cellular response.
Sponsored Presentation (Opportunity Available)8:30 am
Visualizing GPCR Dynamics for Structural Insights: Single-Molecule Fluorescence
Rajan Lamichhane, PhD, Assistant Professor, Biochemistry & Cellular and Molecular Biology, University of Tennessee at Knoxville
The structural plasticity and dynamics of GPCRs are crucial for their activation and signal transduction. Understanding these dynamic conformational changes is important for developing drugs that target GPCRs with high specificity and low side effects. While the structures of some GPCR conformers have been characterized, the dynamics of these conformations are mostly unknown. Single-molecule fluorescence (SMF) helps to reveal the conformational dynamics of individual molecules in real time during GPCR activation.
GPCR Regulation by Membrane Potential
Yair Ben-Chaim, PhD, Senior Lecturer & Head, Natural Sciences, Open University of Israel
Traditionally, G protein coupled receptors (GPCRs) were not considered to be regulated by the membrane potential. However, several studies from the last two decades demonstrated that several GPCRs were. I will present the evidence for such voltage dependence, the mechanism that underlies it, and the drug discovery implications of this novel allosteric modulation.
Coffee Break in the Exhibit Hall with Poster Viewing10:00 am
PLENARY KEYNOTE PROGRAM
Plenary Keynote Introduction (Sponsorship Opportunity Available)10:45 am
PLENARY: The New Science of Therapeutics
Jay E. Bradner, MD, Physician Scientist, Former President, Novartis Institutes for BioMedical Research, Inc.
I will share reflections on how new paradigms in the science of therapeutics are creating opportunities to approach historic challenges in medicine. Specifically, I will share approaches to targeting transcription factors and discuss how modularity is a paradigm for next-generation low-molecular weight and biological therapeutics. Finally, I will offer reflections on drug development and the fitness, opportunities, and challenges of the biomedical ecosystem.
PLENARY: Accelerating Drug Discovery Using Machine Learning and Cell Painting Images
Microscopy images can reveal whether a cell is diseased, is responding to a drug treatment, or whether a pathway has been disrupted by a genetic mutation. In a strategy called image-based profiling, often using the Cell Painting assay, we extract hundreds of features of cells from images. Just like transcriptional profiling, the similarities and differences in the patterns of extracted features reveal connections among diseases, drugs, and genes.
Close of GPCR-Based Drug Discovery Conference12:25 pm