Non-canonical subunit functions in multiprotein complexes: insights from the Mediator complex

Abstract

The Mediator complex is a central regulator of RNA polymerase II transcription, integrating signals from transcription factors and coordinating pre-initiation complex assembly. Beyond this canonical role, numerous studies have implicated Mediator complex in diverse cellular processes, including RNA processing, DNA repair, and translational control. These observations raise a fundamental question: do such functions reflect an expansion of Mediator activity as a complex, or the emergence of specialized functions at the level of individual subunits? In this review, we examine the ability of Mediator subunits to function independently of their canonical context and discuss the mechanistic principles that enable subunit specialization within multiprotein assemblies.

Firrm functions as a multiprotein interaction platform that coordinates Mcm8-9-Hrob recruitment and Fignl1-mediated Rad51 unloading
D. Nishiguchi, Y. Takahashi, N. Tani +6
bioRxiv19 Oct 2026PreprintAll rights reservedFull textMolecular biology & gene regulationbioRxiv
Molecular architecture of TE-seeded chromosome-naive initiation networks of protein-protein interactions delineates the Human Protein Map of the assembly of multiprotein complexes
Gennadi Glinsky
arXiv1 Oct 2026PreprintCC BY 4.0Full textBiophysicsarXiv
Reconstitution of +1 nucleosome transcription reveals coordinated functions of SAGA, Mediator, and TFIIH
S. Nagai, D.-H. Chen, R. U. H. Mattoo +2
bioRxiv24 Sep 2026PreprintCC BY-NCFull textMolecular biology & gene regulationbioRxiv
DNA Damage Recognition by Bacterial and Human Adenine-DNA Glycosylases: Insights from Non-Canonical Substrates
Ulan Sarsenbayeva, Didier Gasparutto, Nicolas Geacintov +9
Biomolecules20 Aug 2026Peer-reviewedCC BY 4.0Full textMolecular biology & gene regulationHAL
DNA mimic helical foldamers with up to 100 units: synthesis and recognition of a multiprotein complex
Manuel Loos, Franziska Därr, Céline Douat +5
Nucleic Acids Research4 Nov 2026Peer-reviewedCC BY-NC 4.0Full textMolecular biology & gene regulationPMC

Cite

BibTeX RIS

BibTeX

@article{verger2026noncanonical,
  title = {{Non-canonical subunit functions in multiprotein complexes: insights from the Mediator complex}},
  author = {Alexis Verger and Didier Monté and Vincent Villeret},
  journal = {Biochemical Society Transactions},
  year = {2026},
  month = jun,
  doi = {10.1042/bst20260729},
  url = {https://hal.science/hal-05796436v1},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - Non-canonical subunit functions in multiprotein complexes: insights from the Mediator complex
AU  - Alexis Verger
AU  - Didier Monté
AU  - Vincent Villeret
PY  - 2026
DA  - 2026/06/22
JO  - Biochemical Society Transactions
DO  - 10.1042/bst20260729
UR  - https://hal.science/hal-05796436v1
AB  - The Mediator complex is a central regulator of RNA polymerase II transcription, integrating signals from transcription factors and coordinating pre-initiation complex assembly. Beyond this canonical role, numerous studies have implicated Mediator complex in diverse cellular processes, including RNA processing, DNA repair, and translational control. These observations raise a fundamental question: do such functions reflect an expansion of Mediator activity as a complex, or the emergence of specialized functions at the level of individual subunits? In this review, we examine the ability of Mediator subunits to function independently of their canonical context and discuss the mechanistic principles that enable subunit specialization within multiprotein assemblies.
SN  - 0300-5127
SN  - 1470-8752
ER  -

Abstract

Related

Cite