Abstract
The MYC oncogene is a frequently activated oncogene in human cancers, and its high expression is strongly correlated with a poor prognosis. The lack of conventional enzyme-binding sites in MYC poses significant challenges for the development of small-molecule-based therapies to treat MYC-deregulated cancer. In particular, only one transmembrane peptide that targets c-MYC has advanced to early clinical trials, thus highlighting the need of effective and direct approaches for targeting c-MYC in cancer treatment. In this study, we developed a conjugated nanobody (NB) that specifically targets MYC, termed a cell-permeable MYC-targeting nanobody (CPMycNB), via sortase-mediated protein ligation. CPMycNB effectively entered the nucleus and bound to c-MYC, thereby disrupting the c-MYC-MAX interaction. This disruption resulted in the downregulation of c-MYC-targeted genes, activation of apoptotic pathways, and inhibition of cell growth and proliferation in c-MYC-driven tumor cells. Using hydrogen-deuterium exchange mass spectrometry, we found that CPMycNB interacted with the leucine zipper domain of c-MYC. Furthermore, xenograft studies confirmed the therapeutic efficacy of CPMycNB, which significantly reduced tumor size and weight. Our findings highlight the potential of CPMycNB for the treatment of c-MYC-associated malignancies.

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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This study was supported by the National Key Research and Development Program of China (Grant No. 2021YFA1302601), the National Natural Science Foundation of China (Grant No. 82172556), the Beijing Natural Science Foundation (IS24040), and the National Natural Science Foundation of China (Grant No. T2293763). We greatly appreciate the Facility for Protein Chemistry and Proteomics at Tsinghua University for sample analysis.
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YX conceived and coordinated the entire project, designed the experiments, conducted data analysis, and authored the manuscript. HJ, TL, XT, and ZZ performed the experiments and analyzed the data. WD and YW contributed to data analysis and the interpretation of results. ZM and HD were responsible for additional data analysis and critically reviewed the manuscript.
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Xue, Y., Jiang, H., Li, T. et al. Inhibition of tumor growth using A conjugated nanobody that specifically targets c-MYC. Oncogene 44, 3213–3224 (2025). https://doi.org/10.1038/s41388-025-03486-x
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DOI: https://doi.org/10.1038/s41388-025-03486-x
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