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DSS1 is required for proper Integrator-PP2A function.

Congling Xu1, Qian-Xing Zhou2, Hai Zheng2

  • 1Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation, Clinical Research Center for Anesthesiology and Perioperative Medicine, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, China. conglingxu@tongji.edu.cn.

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|July 5, 2025
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Summary
This summary is machine-generated.

Human DSS1 protein is a key part of the Integrator-PP2A (INTAC) complex, crucial for regulating gene transcription and maintaining genome stability. Its interaction with INTAC is vital for proper function.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Protein Structure and Function

Background:

  • The Integrator-PP2A (INTAC) complex plays a critical role in managing RNA polymerase II activity, influencing transcription elongation and termination.
  • Dysregulation of INTAC function is linked to broader issues like transcription errors and genomic instability.

Purpose of the Study:

  • To identify and characterize the role of human DSS1 protein within the INTAC complex.
  • To elucidate the structural interactions between DSS1 and INTAC and their functional implications.

Main Methods:

  • Structural analysis of DSS1-INTAC complex formation.
  • Site-directed mutagenesis of DSS1 (Tryptophan 39) to assess interaction disruption.
  • Assays to evaluate the impact of DSS1 mutations on INTAC-dependent transcriptional regulation.

Main Results:

  • Human DSS1 is identified as an integral subunit of the INTAC complex.
  • Structural studies reveal close interactions between DSS1 and the INTAC backbone.
  • Mutation of DSS1 Tryptophan 39 disrupts INTAC binding, impairing transcriptional regulation and confirming INTAC as DSS1's primary chromatin-bound form.

Conclusions:

  • DSS1 is essential for the structural integrity and regulatory function of the INTAC complex.
  • The findings highlight a novel role for DSS1 in supporting gene transcription and genome stability through its interaction with INTAC.