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Structural insights into a highly flexible zinc finger module unravel INSM1 function in transcription regulation

Author

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  • Heng Zhou

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Xiaoling He

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics)

  • Yue Xiong

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Yixuan Gong

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Yuanyuan Zhang

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Shuangli Li

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics)

  • Rui Hu

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Ying Li

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Xu Zhang

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Xin Zhou

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Jiang Zhu

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Yunhuang Yang

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

  • Maili Liu

    (Chinese Academy of Sciences – Wuhan National Laboratory for Optoelectronics
    University of Chinese Academy of Sciences)

Abstract

Orderly development of neuroendocrine and nervous system of mammals requires INSM1, a key regulator for cell differentiation. Ectopic expression of INSM1 is closely correlated with human neuroendocrine tumorigenesis, which makes INSM1 a reliable diagnostic biomarker and potential therapeutic target. To date, INSM1 is known as a transcription repressor binding to GGGG-contained DNA element and TEAD1 using its five zinc fingers (ZFs), while the binding mechanism remains unknown. Here, we reveal highly variable conformations of the whole structure of the five ZFs, among which ZF1 adopts an unusual CCHC-fold. ZF1 binds to the TEAD domain of TEAD1 through hydrophobic interactions, and forms a ternary complex with TEAD1 and TEAD1-targeted DNA. Based on this, INSM1 cooperates with TEAD1 to repress the transcription of TEAD1-targeted genes. ZF2 and ZF3 of INSM1 can bind to DNA but have no specificity to the GGGG-contained element due to long flexible interdomain linker. Instead, INSM1 collaborates with CTCF to target genome loci having the GGGG-contained element and regulate the expression of adjacent genes. This study defines a functional mode of INSM1 by cooperating with diverse DNA-binding proteins for targeting specific genome loci in transcription regulation, and provides structural information for designing INSM1-related therapeutic drugs and diagnostic probes.

Suggested Citation

  • Heng Zhou & Xiaoling He & Yue Xiong & Yixuan Gong & Yuanyuan Zhang & Shuangli Li & Rui Hu & Ying Li & Xu Zhang & Xin Zhou & Jiang Zhu & Yunhuang Yang & Maili Liu, 2025. "Structural insights into a highly flexible zinc finger module unravel INSM1 function in transcription regulation," Nature Communications, Nature, vol. 16(1), pages 1-18, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57478-2
    DOI: 10.1038/s41467-025-57478-2
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