8oz3

From Proteopedia

Crystal structure of scFv ATOR 1017 bound to human 4-1BB

Structural highlights

8oz3 is a 6 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 3.1Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TNR9_HUMAN Receptor for TNFSF9/4-1BBL. Possibly active during T cell activation.

Publication Abstract from PubMed

BACKGROUND: 4-1BB (CD137) is a co-stimulatory receptor highly expressed on tumor reactive effector T cells and NK cells, which upon stimulation prolongs persistence of tumor reactive effector T and NK cells within the tumor and induces long-lived memory T cells. 4-1BB agonistic antibodies have been shown to induce strong anti-tumor effects that synergize with immune checkpoint inhibitors. The first generation of 4-1BB agonists was, however, hampered by dose-limiting toxicities resulting in suboptimal dose levels or poor agonistic activity. METHODS: ATOR-1017 (evunzekibart), a second-generation Fc-gamma receptor conditional 4-1BB agonist in IgG4 format, was designed to overcome the limitations of the first generation of 4-1BB agonists, providing strong agonistic effect while minimizing systemic immune activation and risk of hepatoxicity. The epitope of ATOR-1017 was determined by X-ray crystallography, and the functional activity was assessed in vitro and in vivo as monotherapy or in combination with anti-PD1. RESULTS: ATOR-1017 binds to a unique epitope on 4-1BB enabling ATOR-1017 to activate T cells, including cells with an exhausted phenotype, and NK cells, in a cross-linking dependent, FcgammaR-conditional, manner. This translated into a tumor-directed and potent anti-tumor therapeutic effect in vivo, which was further enhanced with anti-PD-1 treatment. CONCLUSIONS: These preclinical data demonstrate a strong safety profile of ATOR-1017, together with its potent therapeutic effect as monotherapy and in combination with anti-PD1, supporting further clinical development of ATOR-1017.

ATOR-1017 (evunzekibart), an Fc-gamma receptor conditional 4-1BB agonist designed for optimal safety and efficacy, activates exhausted T cells in combination with anti-PD-1.,Enell Smith K, Fritzell S, Nilsson A, Barchan K, Rosen A, Schultz L, Varas L, Sall A, Rose N, Hakansson M, von Schantz L, Ellmark P Cancer Immunol Immunother. 2023 Dec;72(12):4145-4159. doi: , 10.1007/s00262-023-03548-7. Epub 2023 Oct 5. PMID:37796298^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Enell Smith K, Fritzell S, Nilsson A, Barchan K, Rosén A, Schultz L, Varas L, Säll A, Rose N, Håkansson M, von Schantz L, Ellmark P. ATOR-1017 (evunzekibart), an Fc-gamma receptor conditional 4-1BB agonist designed for optimal safety and efficacy, activates exhausted T cells in combination with anti-PD-1. Cancer Immunol Immunother. 2023 Dec;72(12):4145-4159. PMID:37796298 doi:10.1007/s00262-023-03548-7