7RX0 image
Deposition Date 2021-08-20
Release Date 2022-06-15
Last Version Date 2024-06-05
Entry Detail
PDB ID:
7RX0
Keywords:
Title:
Complex of AMPPNP-Kif7 and Gli2 Zinc-Finger domain bound to microtubules
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Sus scrofa (Taxon ID: 9823)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.89 Å
Aggregation State:
HELICAL ARRAY
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Tubulin alpha-1A chain
Gene (Uniprot):TUBA1A
Chain IDs:C (auth: A)
Chain Length:451
Number of Molecules:1
Biological Source:Sus scrofa
Polymer Type:polypeptide(L)
Molecule:Tubulin beta chain
Chain IDs:D (auth: B)
Chain Length:445
Number of Molecules:1
Biological Source:Sus scrofa
Polymer Type:polypeptide(L)
Molecule:Kinesin-like protein KIF7
Gene (Uniprot):KIF7
Chain IDs:A (auth: C)
Chain Length:544
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Zinc finger protein GLI2
Chain IDs:B (auth: G)
Chain Length:92
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Cytoskeletal regulation of a transcription factor by DNA mimicry via coiled-coil interactions.
Nat.Cell Biol. 24 1088 1098 (2022)
PMID: 35725768 DOI: 10.1038/s41556-022-00935-7

Abstact

A long-established strategy for transcription regulation is the tethering of transcription factors to cellular membranes. By contrast, the principal effectors of Hedgehog signalling, the GLI transcription factors, are regulated by microtubules in the primary cilium and the cytoplasm. How GLI is tethered to microtubules remains unclear. Here, we uncover DNA mimicry by the ciliary kinesin KIF7 as a mechanism for the recruitment of GLI to microtubules, wherein the coiled-coil dimerization domain of KIF7, characterized by its striking shape, size and charge similarity to DNA, forms a complex with the DNA-binding zinc fingers in GLI, thus revealing a mode of tethering a DNA-binding protein to the cytoskeleton. GLI increases KIF7 microtubule affinity and consequently modulates the localization of both proteins to microtubules and the cilium tip. Thus, the kinesin-microtubule system is not a passive GLI tether but a regulatable platform tuned by the kinesin-transcription factor interaction. We retooled this coiled-coil-based GLI-KIF7 interaction to inhibit the nuclear and cilium localization of GLI. This strategy can potentially be exploited to downregulate erroneously activated GLI in human cancers.

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Primary Citation of related structures