We are a clinical-stage biopharmaceutical company that is focused on discovering, developing and commercializing novel therapeutics to improve the lives of patients suffering from life-threatening disease, starting with our lead candidate,
PBI-0451,
which is in clinical development and intended to treat and prevent coronaviral (CoV) infections.
COVID-19
is caused by infection with the severe acute respiratory syndrome coronavirus 2, or
and has emerged as the most significant pandemic threat for the world in many decades. We have built a discovery platform designed to target reactive nucleophiles, such as those in cysteine proteases. By leveraging our understanding of structure-based drug design, reversible covalent chemistry and viral biology, we have discovered and are developing novel product candidates with low nanomolar potency against
and broad activity against all known pathogenic human coronaviruses. Our lead product candidate,
PBI-0451,
inhibits the main coronaviral cysteine protease, or M
pro
, a viral protein essential for replication of all known coronaviruses, including SARS-Cov-2. In preclinical studies,
PBI-0451
has demonstrated activity against all coronaviral proteases tested, as well as inhibition of replication of multiple coronaviruses, including
Moreover, in
pre-clinical
studies,
PBI-0451
demonstrated the potential for oral bioavailability across multiple
pre-clinical
species, and more recently, oral bioavailability in healthy volunteers in our
on-going
Phase 1 clinical trial. We believe the anti-viral potency seen against
in preclinical in vitro studies and demonstrated oral bioavailability in humans supports its potential to be an oral direct acting antiviral, or DAA, for use against
infections. We plan to further develop
PBI-0451
for both oral treatment and prophylaxis of
infection. Given the highly conserved nature of the M
pro
target, which is shared among all known coronaviruses, including emerging variants of concern, we believe
PBI-0451
will likely retain its potency and activity against current and emerging
variants.