Download MendeleyStructural convergence endows nuclear transport receptor Kap114p with a transcriptional repressor function toward TATA-binding protein.
Liao, C.C., Wang, Y.S., Pi, W.C., Wang, C.H., Wu, Y.M., Chen, W.Y., Hsia, K.C.(2023) Nat Commun 14: 5518-5518
- PubMed: 37684250
- DOI: https://doi.org/10.1038/s41467-023-41206-9
- Primary Citation of Related Structures:
8H5B - PubMed Abstract:
The transcription factor TATA-box binding protein (TBP) modulates gene expression in nuclei. This process requires the involvement of nuclear transport receptors, collectively termed karyopherin-β (Kap-β) in yeast, and various regulatory factors. In previous studies we showed that Kap114p, a Kap-β that mediates nuclear import of yeast TBP (yTBP), modulates yTBP-dependent transcription. However, how Kap114p associates with yTBP to exert its multifaceted functions has remained elusive. Here, we employ single-particle cryo-electron microscopy to determine the structure of Kap114p in complex with the core domain of yTBP (yTBP C ). Remarkably, Kap114p wraps around the yTBP C N-terminal lobe, revealing a structure resembling transcriptional regulators in complex with TBP, suggesting convergent evolution of the two protein groups for a common function. We further demonstrate that Kap114p sequesters yTBP away from promoters, preventing a collapse of yTBP dynamics required for yeast responses to environmental stress. Hence, we demonstrate that nuclear transport receptors represent critical elements of the transcriptional regulatory network.
Organizational Affiliation:
Molecular and Cell Biology, Taiwan International Graduate Program, Academia Sinica and National Defense Medical Center, Taipei, 11490, Taiwan.
