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TitleDevelopment of a PRAME pMHC targeted T cell engager for solid tumor therapy.
Journal, issue, pagesMAbs, Vol. 17, Issue 1, Page 2563773, Year 2025
Publish dateSep 24, 2025
AuthorsKatarzyna Skrzypczynska / Kristin Schimert / Heather Stephenson / In Kyoung Mah / David Mortenson / Kelli Boyd / Timothy Hardman / Nikolai Novikov / Elbert Seto / Sabrina Lu / Randy Yen / Brian Lee / Min Wang / Don Kang / Ying Huang / Xinchao Yu / Magdeleine Hung / Sheng Ding / Nathan Thomsen / Nicole Schirle Oakdale /
PubMed AbstractBispecific T cell engager (TCE) therapies have demonstrated transformative clinical success in the treatment of hematological cancers, but the lack of antigens that are sufficiently selective for ...Bispecific T cell engager (TCE) therapies have demonstrated transformative clinical success in the treatment of hematological cancers, but the lack of antigens that are sufficiently selective for malignant cells has hampered the success of TCEs in the solid-tumor space. To overcome the on-target, off-tumor toxicities that result from the expression of even low levels of tumor-associated antigens in healthy tissues, we sought to identify a TCE target with highly tumor-restricted expression patterns. Here, we characterize cancer-testes antigen Preferentially Expressed Antigen in Melanoma (PRAME) as a highly selective tumor antigen and identify a proteasomal degradation peptide PRAME (PRAME) presented in the context of major histocompatibility complex I (MHCI) as an attractive TCE target. We designed a TCR-mimic (TCRm) antibody screening cascade that prioritizes screening anti-PRAME pMHC binders in off-target T cell dependent cellular cytotoxicity assays in a potent TCE format, rather than relying solely on traditional pMHC binding assays, to determine specificity. Using this screening cascade, we discovered antibodies that selectively bind PRAME pMHC without over-recognition of off-target peptides or MHCI via a TCR-like binding geometry. We further solved the first structure of an anti-PRAME pMHC TCRm antibody in complex with PRAME/HLA-A *02:01 using cryo electron microscopy to confirm the TCRm antibody binds in a TCR-like binding geometry and specifically recognizes the PRAME peptide. By formatting these novel TCRm antibodies into potent TCEs, we demonstrate PRAME pMHC-specific killing of tumor cells, representing a new class of anti-PRAME pMHC biologics.
External linksMAbs / PubMed:40994043 / PubMed Central
MethodsEM (single particle)
Resolution2.72 Å
Structure data

71704

9pkv

EMDB-71704, PDB-9pkv:
HU-38 Fab with PRAME pMHC
Method: EM (single particle) / Resolution: 2.72 Å

Chemicals

ChemComp-HOH:
WATER

Source
  • homo sapiens (human)
  • lama glama (llama)
  • mus musculus (house mouse)
KeywordsPEPTIDE BINDING PROTEIN/IMMUNE SYSTEM / PRAME / pMHC / PEPTIDE BINDING PROTEIN / PEPTIDE BINDING PROTEIN-IMMUNE SYSTEM complex

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