ontorpacept   Click here for help

GtoPdb Ligand ID: 12036

Synonyms: TTI-621 | TTI621
Comment: Ontorpacept (TTI-621) is a 345 amino acid fusion protein that consists of the N-terminal V domain of human SIRPα fused to the Fc region of human IgG1 that was designed as an immuno-oncology agent [1]. The SIRPα domain binds to CD47 on cancer cells (to block the CD47-SIRPα anti-phagocytic signal). Inclusion of the IgG1 Fc region enhances phagocytosis of malignant cells via interaction with Fcγ receptors.
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Selectivity at other protein targets
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Target Sp. Type Action Value Parameter Concentration range (M) Reference
CD47 Hs Fusion protein Binding 7.8 pEC50 - 1
pEC50 7.8 (EC50 1.4x10-8 M) [1]
Description: Binding affinity of biotinylated TTI-621 for SU16 human B cell lymphoma cells in vitro