R01AI161570

Broad-Spectrum Therapeutics Against SARS-CoV-2 3CL Protease - Project Summary/Abstract

COVID-19 was first identified in December 2019 in Wuhan, Hubei Province, China, resulting in the ongoing 2019-2020 pandemic. COVID-19 is caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). Common symptoms of the disease include fever, dry cough, shortness of breath, diarrhea, and loss of smell. Complications may include pneumonia, viral sepsis, and acute respiratory distress syndrome.

As of today, other than Remdesivir, there is no approved small molecule drug for the treatment of COVID-19 and the discovery of an effective vaccine remains uncertain. Our long-term goal is to develop antiviral drugs for the treatment of COVID-19 and human coronavirus infections in general.

Our central hypothesis is that inhibition of SARS-CoV-2 polyprotein cleavage results in the prevention and early treatment of COVID-19 before it progresses to its more severe form. We will identify nanomolar inhibitors of the CoV 3C-like protease (3CLpro) suitable to be developed as antiviral agents for the treatment of COVID-19 and other coronavirus infections.

The proposal targets the 3CLpro, a key enzyme for SARS-CoV-2 polyprotein cleavage and viral replication. Our overall premise is that small molecule inhibitors targeting this essential viral enzyme will inhibit replication, and therefore have the potential to be of both preventive and therapeutic value.

Thus, our primary objective is to design and develop structure-based small-molecule inhibitors targeting coronavirus 3CLpro using our established and proven drug discovery expertise. Guided by strong preliminary data, the inhibition of polyprotein cleavage hypothesis will be tested by pursuing three specific aims:

Aim 1) To inhibit SARS-CoV-2 polyprotein cleavage by developing covalent peptidic inhibitors of 3CLpro (NSP5).

Aim 2) To inhibit SARS-CoV-2 polyprotein cleavage by developing noncovalent nonpeptidic inhibitors of 3CLpro (NSP5).

Aim 3) To determine the efficacy of covalent and noncovalent SARS-CoV-2 3CLpro inhibitors in a golden hamster model.

Under the first aim, lead compound 3150 and its analogs will be tested in viral and enzyme assays for inhibitory activity of SARS-CoV-2 3CLpro. An aqueous soluble form of 3150 will be evaluated in the animal model. Structure-based drug design approaches will be employed to optimize 3150 for binding to the crystal structure of SARS-CoV-2 3CLpro.

Under Aim 2, structure-based virtual screening and hybrid ligand screening approaches along with medicinal chemistry will be used to prepare and evaluate noncovalent nonpeptidic inhibitors of 3CLpro.

Under the third aim, top-ranked SARS-CoV-2 3CLpro covalent and noncovalent inhibitors will be tested for pharmacokinetics and efficacy in a golden hamster COVID-19 model.

The ultimate goal of the proposed studies is to advance an anti-COVID-19 drug candidate to the stage of filing an Investigational New Drug (IND) application.

Overall, the results of this project will have a significant positive impact because they lay the groundwork for the clinical development of COVID-19 antiviral therapy and the potential to combine a potent and selective protease inhibitor with a nucleoside analog (e.g., Remdesivir) and, if needed, anti-inflammatory drugs (e.g., Dexamethasone or Baricitinib).

Emory University

TO ASSIST PUBLIC AND PRIVATE NONPROFIT INSTITUTIONS AND INDIVIDUALS TO ESTABLISH, EXPAND AND IMPROVE BIOMEDICAL RESEARCH AND RESEARCH TRAINING IN INFECTIOUS DISEASES AND RELATED AREAS, TO CONDUCT DEVELOPMENTAL RESEARCH, TO PRODUCE AND TEST RESEARCH MATERIALS. TO ASSIST PUBLIC, PRIVATE AND COMMERCIAL INSTITUTIONS TO CONDUCT DEVELOPMENTAL RESEARCH, TO PRODUCE AND TEST RESEARCH MATERIALS, TO PROVIDE RESEARCH SERVICES AS REQUIRED BY THE AGENCY FOR PROGRAMS IN INFECTIOUS DISEASES, AND CONTROLLING DISEASE CAUSED BY INFECTIOUS OR PARASITIC AGENTS, ALLERGIC AND IMMUNOLOGIC DISEASES AND RELATED AREAS. PROJECTS RANGE FROM STUDIES OF MICROBIAL PHYSIOLOGY AND ANTIGENIC STRUCTURE TO COLLABORATIVE TRIALS OF EXPERIMENTAL DRUGS AND VACCINES, MECHANISMS OF RESISTANCE TO ANTIBIOTICS AS WELL AS RESEARCH DEALING WITH EPIDEMIOLOGICAL OBSERVATIONS IN HOSPITALIZED PATIENTS OR COMMUNITY POPULATIONS AND PROGRESS IN ALLERGIC AND IMMUNOLOGIC DISEASES. BECAUSE OF THIS DUAL FOCUS, THE PROGRAM ENCOMPASSES BOTH BASIC RESEARCH AND CLINICAL RESEARCH. SMALL BUSINESS INNOVATION RESEARCH (SBIR) PROGRAM EXPANDS AND IMPROVES PRIVATE SECTOR PARTICIPATION IN BIOMEDICAL RESEARCH. THE SBIR PROGRAM INTENDS TO INCREASE AND FACILITATE PRIVATE SECTOR COMMERCIALIZATION OF INNOVATIONS DERIVED FROM FEDERAL RESEARCH AND DEVELOPMENT, TO INCREASE SMALL BUSINESS PARTICIPATION IN FEDERAL RESEARCH AND DEVELOPMENT, AND TO FOSTER AND ENCOURAGE PARTICIPATION OF SOCIALLY AND ECONOMICALLY DISADVANTAGED SMALL BUSINESS CONCERNS AND WOMEN-OWNED SMALL BUSINESS CONCERNS IN TECHNOLOGICAL INNOVATION. THE SMALL BUSINESS TECHNOLOGY TRANSFER (STTR) PROGRAM STIMULATES AND FOSTERS SCIENTIFIC AND TECHNOLOGICAL INNOVATION THROUGH COOPERATIVE RESEARCH AND DEVELOPMENT CARRIED OUT BETWEEN SMALL BUSINESS CONCERNS AND RESEARCH INSTITUTIONS, TO FOSTER TECHNOLOGY TRANSFER BETWEEN SMALL BUSINESS CONCERNS AND RESEARCH INSTITUTIONS, TO INCREASE PRIVATE SECTOR COMMERCIALIZATION OF INNOVATIONS DERIVED FROM FEDERAL RESEARCH AND DEVELOPMENT, AND TO FOSTER AND ENCOURAGE PARTICIPATION OF SOCIALLY AND ECONOMICALLY DISADVANTAGED SMALL BUSINESS CONCERNS AND WOMEN-OWNED SMALL BUSINESS CONCERNS IN TECHNOLOGICAL INNOVATION. RESEARCH CAREER DEVELOPMENT AWARDS SUPPORT THE DEVELOPMENT OF SCIENTISTS DURING THE FORMATIVE STAGES OF THEIR CAREERS. INDIVIDUAL NATIONAL RESEARCH SERVICE AWARDS (NRSAS) ARE MADE DIRECTLY TO APPROVE APPLICANTS FOR RESEARCH TRAINING IN SPECIFIED BIOMEDICAL SHORTAGE AREAS. IN ADDITION, INSTITUTIONAL NATIONAL RESEARCH SERVICE AWARDS ARE MADE TO ENABLE INSTITUTIONS TO SELECT AND MAKE AWARDS TO INDIVIDUALS TO RECEIVE TRAINING UNDER THE AEGIS OF THEIR INSTITUTIONAL PROGRAM.

93.855 - Allergy and Infectious Diseases Research

National Institute of Allergy and Infectious Diseases (NIAID) [HHS - NIH]

Atlanta, Georgia 303221119 United States

Single Zip Code

Emergency Awards: Rapid Investigation of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) and Coronavirus Disease 2019 (COVID-19) (R01 Clinical Trial Not Allowed) (PAR-20-178)

COVID-19 $1,298,994 (42%) percent of this Project Grant was funded by COVID-19 emergency acts including the 2020 Coronavirus Preparedness and Response Supplemental Appropriations Act and the American Rescue Plan Act of 2021.
Amendment Since initial award the total obligations have increased 353% from $681,379 to $3,089,385.