Journal of Beijing Normal University, Volume. 61, Issue 3, 324(2025)

Regulatory mechanism of transcriptional repression of proteasomal ubiquitin receptor Rpn13

JIN Zhenhui1,2, FAN Libin1, JIANG Tianxia2, and QIU Xiaobo2、*
Author Affiliations
  • 1College of Life Sciences, Anhui Medical University, Hefei, Anhui, China
  • 2Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, and College of Life Sciences, Beijing Normal University, Beijing, China
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    Mammalian Rpn13, a 26S proteasome ubiquitin receptor subunit, binds to ubiquitin substrate at the N terminal but deubiquitin enzyme UCH37 at the C terminal. Rpn13 is known to mediate degradation of most proteins via ubiquitin-proteasome, to regulate autophagy, neuron function, and germ cell development. Proteasome inhibitors are used for tumor prevention and treatment, targeting Rpn13 can overcome resistance against proteasome inhibitors. Transcriptional repression mechanism of its gene expression is unclear. Interactive analysis of gene expression profile revealed that Rpn13 gene was highly expressed in many cancer types, especially in colon cancer, lymphoma, pancreatic, rectal, gastric and thoracic cancers. The activity of the regulatory region −454~−58 bp of Rpn13 promoter was found to be high in double luciferase report assay. Binding sites of multiple transcription factors, including CTCFL (CCCTC binding factor-like), CTCF (CCCTC binding factor), NRF1 (Nuclear respiratory factor 1) and FOXO3 (Forkhead box O3), were predicted on the promoter sequence of Rpn13. We constructed expression plasmids of these transcription factors and found that they all inhibited Rpn13 promoter. By further mutating corresponding transcription factor binding sites of Rpn13 promoter, CTCFL was found to bind −63~−52 bp sequence of the Rpn13 promoter. These studies not only analyzed Rpn13 gene expression in cancer tissues, but also revealed possible transcription inhibition mechanism of Rpn13, providing useful clues for exploring mechanism of Rpn13 in tumor occurrence and development.

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    JIN Zhenhui, FAN Libin, JIANG Tianxia, QIU Xiaobo. Regulatory mechanism of transcriptional repression of proteasomal ubiquitin receptor Rpn13[J]. Journal of Beijing Normal University, 2025, 61(3): 324

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    Paper Information

    Received: Mar. 28, 2024

    Accepted: Aug. 21, 2025

    Published Online: Aug. 21, 2025

    The Author Email: QIU Xiaobo (xqiu@bnu.edu.cn)

    DOI:10.12202/j.0476-0301.2024053

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