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TitleDSS1 is required for proper Integrator-PP2A function.
Journal, issue, pagesNat Commun, Vol. 16, Issue 1, Page 6206, Year 2025
Publish dateJul 5, 2025
AuthorsCongling Xu / Qian-Xing Zhou / Hai Zheng / Aixia Song / Wen-Ying Zhao / Ting-Ting Xu / Yan Xiong / Yi-Jie Zhang / Zixuan Huang / Yanhui Xu / Jingdong Cheng / Fei Xavier Chen /
PubMed AbstractIntegrator-PP2A (INTAC) is a highly modular complex orchestrating the transition of paused RNA polymerase II into productive elongation or promoter-proximal premature termination, with its loss ...Integrator-PP2A (INTAC) is a highly modular complex orchestrating the transition of paused RNA polymerase II into productive elongation or promoter-proximal premature termination, with its loss resulting in transcription dysregulation and genome instability. Here, we identify human DSS1-a flexible 70-residue protein found in multiple functionally diverse complexes including the 26S proteasome-as an integral subunit of the INTAC backbone. Structural analysis of DSS1-INTAC, both alone and in association with paused polymerase, demonstrates intimate interactions between DSS1 and the INTAC backbone. We identify tryptophan 39 of DSS1 as being critical for interacting with INTAC and find that its mutation disrupts DSS1's interaction with INTAC, while maintaining DSS1's interaction with the proteasome. This substitution not only impairs INTAC-dependent transcriptional regulation, but also reveals that INTAC is DSS1's major chromatin-bound form. Together, our findings reveal a role for DSS1 in supporting the structure and regulatory functions of INTAC.
External linksNat Commun / PubMed:40617815 / PubMed Central
MethodsEM (single particle)
Resolution4.1 - 4.6 Å
Structure data

39338

8yjb

EMDB-39338, PDB-8yjb:
Cryo-EM structure of the human DSS1-INTAC complex
Method: EM (single particle) / Resolution: 4.1 Å

PDB-9vd9:
Cryo-EM structure of the human DSS1-INTAC-PEC complex
Method: ELECTRON MICROSCOPY / Resolution: 4.6 Å

Chemicals

ChemComp-ZN:
Unknown entry

ChemComp-MN:
Unknown entry

ChemComp-MG:
Unknown entry

Source
  • homo sapiens (human)
  • sus scrofa (pig)
KeywordsTRANSCRIPTION / DSS1 / Integrator / INTAC

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