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Open data
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Basic information
Entry | Database: PDB / ID: 9b3i | ||||||||||||||||||
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Title | Cryo-EM structure of yeast (Nap1)2-H2A-H2B-Kap114-RanGTP | ||||||||||||||||||
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![]() | TRANSPORT PROTEIN / Histone / Chaperone / Import / Nucleosome Assembly | ||||||||||||||||||
Function / homology | GUANOSINE-5'-TRIPHOSPHATE / : / : / : / : / : ![]() | ||||||||||||||||||
Biological species | ![]() ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.88 Å | ||||||||||||||||||
![]() | Fung, H.Y.J. / Jiou, J. / Chook, Y.M. | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Nap1 and Kap114 co-chaperone H2A-H2B and facilitate targeted histone release in the nucleus. Authors: Ho Yee Joyce Fung / Jenny Jiou / Ashley B Niesman / Natalia E Bernardes / Yuh Min Chook / ![]() Abstract: Core histones, synthesized and processed in the cytoplasm, must be chaperoned as they are transported into the nucleus for nucleosome assembly. The importin Kap114 transports H2A-H2B into the yeast ...Core histones, synthesized and processed in the cytoplasm, must be chaperoned as they are transported into the nucleus for nucleosome assembly. The importin Kap114 transports H2A-H2B into the yeast nucleus, where RanGTP facilitates histone release. Kap114 and H2A-H2B also bind the histone chaperone Nap1, but how Nap1 and Kap114 cooperate in transport and nucleosome assembly remains unclear. Here, biochemical and structural analyses show that Kap114, H2A-H2B, and a Nap1 dimer (Nap12) associate in the absence and presence of RanGTP to form equimolar complexes. A previous study had shown that RanGTP reduces Kap114's ability to chaperone H2A-H2B, but a new cryo-EM structure of the Nap12•H2A-H2B•Kap114•RanGTP complex explains how both Kap114 and Nap12 interact with H2A-H2B, restoring its chaperoning within the assembly while effectively depositing it into nucleosomes. Together, our results suggest that Kap114 and Nap12 provide a sheltered path that facilitates the transfer of H2A-H2B from Kap114 to Nap12, ultimately directing its specific deposition into nucleosomes. | ||||||||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 350.4 KB | Display | ![]() |
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PDB format | ![]() | 272.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 921.8 KB | Display | ![]() |
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Full document | ![]() | 946 KB | Display | |
Data in XML | ![]() | 53.5 KB | Display | |
Data in CIF | ![]() | 81.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 44141MC ![]() 9b23C ![]() 9b31C ![]() 9b3fC C: citing same article ( M: map data used to model this data |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Protein , 5 types, 6 molecules ABCDEF
#1: Protein | Mass: 114833.539 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: KAP114, GI527_G0002177 / Production host: ![]() ![]() |
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#2: Protein | Mass: 13881.980 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: HTA2, GI527_G0000202 / Production host: ![]() ![]() |
#3: Protein | Mass: 14133.145 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: HTB2, GI527_G0000203 / Production host: ![]() ![]() |
#4: Protein | Mass: 21283.520 Da / Num. of mol.: 1 / Mutation: Q71L Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: GSP1, GI527_G0004106 / Production host: ![]() ![]() |
#5: Protein | Mass: 48035.375 Da / Num. of mol.: 2 / Mutation: C200A, C249A, C272A Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: NAP1, GI527_G0003692 / Production host: ![]() ![]() |
-Non-polymers , 2 types, 2 molecules 


#6: Chemical | ChemComp-MG / |
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#7: Chemical | ChemComp-GTP / |
-Details
Has ligand of interest | Y |
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Has protein modification | N |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Complex of Kap114 bound to Ran GTPase Gsp1, H2A-H2B and Nap1 Type: COMPLEX Details: Complex was formed and dialyzed overnight, then mildly crosslinked and separated by size-exclusion chromatography. Entity ID: #1-#5 / Source: RECOMBINANT | |||||||||||||||||||||||||
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Molecular weight | Experimental value: NO | |||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Buffer solution | pH: 7.4 | |||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 1.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: Crosslinked sample. | |||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1 | |||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 280 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 165000 X / Nominal defocus max: 2200 nm / Nominal defocus min: 900 nm |
Specimen holder | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 3.6 sec. / Electron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 9331 |
EM imaging optics | Energyfilter slit width: 20 eV |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1381753 / Details: Blob picker then followed by Topaz picking. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.88 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 133516 Details: Composite map was generated by first applying vop multiply to the particle subtraction mask and the consensus volume (covering Kap114 and RanGTP), then composited with locally refined region ...Details: Composite map was generated by first applying vop multiply to the particle subtraction mask and the consensus volume (covering Kap114 and RanGTP), then composited with locally refined region for the Nap1 and Histone region by vop maximum in Chimera X. Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: OTHER | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | 3D fitting-ID: 1 / Source name: PDB / Type: experimental model
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Refine LS restraints |
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