ArticleProceedings of the National Academy of Sciences of the United States of America2023
Mechanism of RanGTP priming H2A-H2B release from Kap114 in an atypical RanGTP•Kap114•H2A-H2B complex.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed, 14 citations in OpenAlex.
- Bound for the nucleus: defining the molecular principles of cargo selection by importin 9.bioRxiv : the preprint server for biology · 2026Article
- Importin-9 recognizes the winged-helix fold of ETS transcription factors to mediate nuclear import.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Exploration of the proxiOME of large subunit ribosomal proteins reveals Acl1 and Bcl1 as cooperating dedicated chaperones of Rpl1.Nucleic acids research · 2026Article
- Histone Nuclear Import and Beyond: Multifunctional Roles of Importins.BioEssays : news and reviews in molecular, cellular and developmental biology · 2026Review
- Importins recognize the winged-helix fold of ETS transcription factors to mediate nuclear import.bioRxiv : the preprint server for biology · 2026Article
- Structure, function and assembly of nuclear pore complexes.Nature reviews. Molecular cell biology · 2026Review
- A revised model of nuclear actin import: Importin 9 competes with cofilin, profilin, and RanGTP for actin binding.bioRxiv : the preprint server for biology · 2025Article
- Importin-9 and a TPR domain protein MpH drive periodic patterning of ciliary arrays in Tetrahymena.The Journal of cell biology · 2025Article
- Nap1 and Kap114 co-chaperone H2A-H2B and facilitate targeted histone release in the nucleus.The Journal of cell biology · 2025Article
- Molecular basis of RanGTP-activated release of Histones H2A-H2B from Importin-9.Structure (London, England : 1993) · 2023Article
- A new Karyopherin-β2 binding PY-NLS epitope of HNRNPH2 linked to neurodevelopmental disorders.Structure (London, England : 1993) · 2023Article
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
Abstract
Previously, we showed that the nuclear import receptor Importin-9 wraps around the H2A-H2B core to chaperone and transport it from the cytoplasm to the nucleus. However, unlike most nuclear import systems where RanGTP dissociates cargoes from their importins, RanGTP binds stably to the Importin-9•H2A-H2B complex, and formation of the ternary RanGTP•Importin-9•H2A-H2B complex facilitates H2A-H2B release to the assembling nucleosome. It was unclear how RanGTP and the cargo H2A-H2B can bind simultaneously to an importin, and how interactions of the three components position H2A-H2B for release. Here, we show cryo-EM structures of Importin-9•RanGTP and of its yeast homolog Kap114, including Kap114•RanGTP, Kap114•H2A-H2B, and RanGTP•Kap114•H2A-H2B, to explain how the conserved Kap114 binds H2A-H2B and RanGTP simultaneously and how the GTPase primes histone transfer to the nucleosome. In the ternary complex, RanGTP binds to the N-terminal repeats of Kap114 in the same manner as in the Kap114/Importin-9•RanGTP complex, and H2A-H2B binds via its acidic patch to the Kap114 C-terminal repeats much like in the Kap114/Importin-9•H2A-H2B complex. Ran binds to a different conformation of Kap114 in the ternary RanGTP•Kap114•H2A-H2B complex. Here, Kap114 no longer contacts the H2A-H2B surface proximal to the H2A docking domain that drives nucleosome assembly, positioning it for transfer to the assembling nucleosome or to dedicated H2A-H2B chaperones in the nucleus.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.