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Protein design to broadly reprogram engineered T cell function

Boyken, S. E.; Merillat, S.; Langan, R. A.; Moffett, H. F.; Coventry, B.; Haeseleer, F.; Haworth, K. G.; Goreshnik, I.; DeSautelle, J.; Chukinas, J.; Hammerson, B.; Davenport, T. M.; Nguyen, D.; Amin, R.; Yuan, S.; Foight, G. W.; Weitzner, B. D.; Foster, A. E.; Baker, D.; Lajoie, M. J.

2026-08-17 synthetic biology
10.64898/2026.08.13.742806 bioRxiv
Show abstract

The efficacy of engineered T cell therapies in solid tumors remains limited by T cell dysfunction, driven by complex processes that cannot be easily manipulated via genetic knockouts or overexpression of individual genes. Protein design can create new biological functions that can rewire these consequential cell fate decisions. Here, we introduce OUTLAST Regulators, designed proteins that reprogram critical T cell signaling pathways to enhance functional persistence. These proteins are capable of regulating diverse groups of proteins such as the NR4A family of pro-exhaustion transcription factors, E3 ligases Cbl-b and c-Cbl, and SOCS family proteins. Our designs markedly improve CAR-T and TCR-T performance in vitro and in vivo in stringent solid tumor preclinical models. OUTLAST Regulators are implemented as compact genetic modules compatible with standard viral vectors and cell therapy manufacturing processes, creating a powerful platform for programming new functions into enhanced cell and gene therapies.

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