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Structure-guided neutralizing antibodies developed using EpiVolve technology

Award Information
Agency: Department of Health and Human Services
Branch: National Institutes of Health
Contract: 1R44AI177126-01
Agency Tracking Number: R44AI177126
Amount: $296,100.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: NIAID
Solicitation Number: PA22-176
Timeline
Solicitation Year: 2022
Award Year: 2023
Award Start Date (Proposal Award Date): 2023-05-05
Award End Date (Contract End Date): 2024-04-30
Small Business Information
25 Business Park Drive
Branford, CT 06405
United States
DUNS: 117787837
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: Yes
Principal Investigator
 XIAOFENG LI
 (203) 859-4472
 xli@abbratech.com
Business Contact
 MICHAEL WEINER
Phone: (203) 606-5394
Email: mweiner@abbratech.com
Research Institution
N/A
Abstract

Abstract
Current strategies for developing neutralizing Abs are not effective and typically involve screening IgGs from
recovered patients. Pandemic viruses evolve for mutations that can shield their epitopes from host immune
surveillance system, so a lot of important epitopes will be missed. Even after neutralizing Abs isolated are
from human sample, they still need further characterization using epitope binning and determination of
specificities to avoid off target effect. A systematic method for exploring the entire protein surface of a virus
that can identify all potential sites on the virus which can affect its life cycle would have significant impact and
is needed. We propose a structure-guided systematic Ab development pipeline to discover Abs that
can fight infectious diseases. We propose using our novel site-directed Ab development technology,
‘EpiVolve’ (short for Epitope Evolution). EpiVolve will be used to develop site-specific Abs to solvent-exposed
residues and the adjacent ‘context’ sequences. These Abs will be used for fighting infectious disease. The
advantages of EpiVolve are a) overcoming immune tolerance and targeting virus’ human proteome-mimicking
epitopes, b) precisely targeting any antigenic epitopes regardless of its immunogenicity, c) taking advantage
of B cell expansion and somatic hypermutation to generate IgG clonotypes against one targeted residue,
which allows an ability to generate both pan-variants Abs and polymorphism-specific Abs, and d) an ability
for generating a neutralizing Ab discovery pipeline. We will model this on SARS-cov-2 virus in Phase I and
Influenza A in Phase II. EpiVolve developed site-specific antibodies will target solvent-exposed residues on
the protein surface. Structure-guided Ag design will empower the EpiVolve technology in this systematic
analysis. For this proposal, we will present the current preliminary data on the pilot EpiVolve study on SARS-
cov-2 Receptor Binding Domain (RBD), focused mainly on the host cell receptor ACE2 binding interface. For
Phase I studies, we propose to complete the pilot study and extend the study to the whole protein surface of
the RBD domain. Characterizing each Ab by its binding affinity and ability to neutralize SARS-cov-2 virus will
be included in Phase I studies. For Phase II, we propose to apply the learnings from this Phase I study on
another virus model of great importance, the Influenza A virus. Specifically targeting the solvent-accessible
residues of the conserved Stem/Stalk region of the Hemagglutinin (HA) protein

* Information listed above is at the time of submission. *

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