1910 Publishes PEGASUS™, a Multimodal AI Model that Engineers Novel Drug-Like Macrocyclic Peptides

• PEGASUS is an industry-first in peptide design: It achieves AI-driven generative design of the first permeable macrocyclic peptide with more than two polar or ionizable fragments.
• Surrogate assays are a breakthrough for AI model training. 1910 developed a high throughput surrogate wet lab assay that replaces the industry standard low-throughput biological assay for training PEGASUS.
• PEGASUS was published as a Featured Article in the Journal of Medicinal Chemistry based on its exceptional novelty and significant scientific merit, and was hailed as a breakthrough innovation in peptide design by practitioners who are typically skeptical of AI.

BOSTON–(BUSINESS WIRE)–1910, the only AI-native biotech pioneering small and large molecule therapeutics discovery, today announced the publication of PEGASUS, a multimodal AI model that achieves state-of-the-art accuracy in predicting and designing cell-permeable macrocyclic peptides.

As featured in the Journal of Medicinal Chemistry, PEGASUS generated the first reported macrocyclic peptides containing more than two polar or charged fragments that demonstrate in vitro cell permeability, addressing a longstanding barrier in peptide drug design. The publication, titled “PEGASUS: Unlocking Polarity in Cell-Permeable Cyclic Peptides Using AI Models Built on Massively Parallel Biological Assays,” is available here.

Macrocyclic peptides are a promising therapeutic class with the potential for oral bioavailability and intracellular activity, yet efforts to design them have been constrained by the intrinsic difficulty of achieving cell permeability. And although AI could help overcome this barrier, progress has been limited by a lack of permeability existing datasets are scarce, sparse, and biased toward hydrophobic peptides, limiting the ability of AI models to generalize beyond a narrow chemical space.

PEGASUS overcomes these challenges by integrating three data modalities:

• Wet-lab proxy biological data generated through 1910’s high-throughput Permeability Proxy Assay (1910 PPA), which fractionated 2.7 billion macrocyclic peptides by hydrophobicity;
• Computational simulation data from solvent-dependent quantum mechanical models; and
• Geometric and biological embeddings that learn structural features relevant to permeability.

These combined datasets enable PEGASUS to learn permeability-relevant features across the full landscape of macrocyclic peptide chemistry, including regions with high polarity and charge that have historically been inaccessible to rational design. Access to this space is critical: limiting designs to low-polarity, hydrophobic peptides both increases the risk of off-target binding and in vivo toxicity, and shrinks the number of allowable peptide sequences by 96.7%, excluding peptide structures that more closely resemble existing FDA-approved therapeutics.

“In drug discovery, AI has always been constrained by the lack of large, high-quality biological datasets,” said Jen Asher, Ph.D., Founder and CEO of 1910. “PEGASUS closes that gap. By generating billions of experimental data points and integrating them with physics-based simulations, we built a model that expands the therapeutic possibilities for macrocyclic peptides.”

In retrospective validation, the PEGASUS predictive framework improved hit rates by 13.1% when used as a pre-synthesis filter, outperforming existing deep learning approaches. The integrated generative component (CycPepVAE) produced 33 macrocyclic peptides that resemble FDA-approved therapeutics in polarity and charge; among those synthesized and tested, four achieved permeability consistent with in vivo oral bioavailability – a first for peptides in this chemical regime.

“Cell permeability is essential for oral drug delivery, yet there remains limited chemical overlap between macrocyclic peptides that are routinely designed to be permeable and those that have achieved clinical success,” said Cole Baker, AI Research Scientist II at 1910 and lead author of the publication. “Our work helps bridge this gap to enable the design of orally bioavailable macrocyclic peptide therapeutics.”

Developed within 1910’s ITO platform, PEGASUS functions both as a high-accuracy predictor of permeability for large, polar macrocyclic peptides and as a generative system that designs drug-like peptide candidates with improved solubility, polarity, and charge characteristics.

The publication establishes PEGASUS as the most comprehensive AI system for macrocyclic peptide permeability to date and provides a blueprint for using multimodal data integration to advance new therapeutic modalities.

About 1910

1910 is the only AI-native biotech pioneering small and large molecule therapeutics discovery by integrating massive multimodal data, frontier AI models, and high-throughput lab automation into an infrastructure for AI-enabled drug discovery.

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