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Open data
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Basic information
| Entry | ![]() | |||||||||
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| Title | Structure of the Bombyx mori apo-bmCCAN | |||||||||
Map data | Composite apo-bmCCAN map, sharpened | |||||||||
Sample |
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Keywords | CCAN / complex / protein-DNA / segregation / DNA BINDING PROTEIN | |||||||||
| Function / homology | Function and homology informationinner kinetochore / CENP-A containing chromatin assembly / mitotic sister chromatid segregation / chromosome, centromeric region / nucleus Similarity search - Function | |||||||||
| Biological species | ![]() ![]() | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.0 Å | |||||||||
Authors | Yatskevich S / Ciferri C | |||||||||
| Funding support | 1 items
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Citation | Journal: Sci Adv / Year: 2026Title: Architecture and function of holocentric CENP-A-independent inner kinetochores. Authors: Christine Yu / Sundar Ram Sankaranarayanan / Gaetan Cornilleau / Anna C Howes / Caleigh M Azumaya / Eric S Day / Inna Zilberleyb / Bobby Brillantes / Tommy K Cheung / Leonie Dec / Damarys ...Authors: Christine Yu / Sundar Ram Sankaranarayanan / Gaetan Cornilleau / Anna C Howes / Caleigh M Azumaya / Eric S Day / Inna Zilberleyb / Bobby Brillantes / Tommy K Cheung / Leonie Dec / Damarys Loew / Phong Tran / Christopher M Rose / Ines Anna Drinnenberg / Claudio Ciferri / Stanislau Yatskevich / ![]() Abstract: Kinetochores are essential macromolecular complexes anchoring chromosomes to the mitotic spindle, ensuring faithful cell division. Despite their critical role, the structural organization of ...Kinetochores are essential macromolecular complexes anchoring chromosomes to the mitotic spindle, ensuring faithful cell division. Despite their critical role, the structural organization of kinetochores across diverse species remains poorly understood. We present the inner kinetochore constitutive centromere-associated network (CCAN) structure of the silkmoth , an insect that lacks the canonical centromere-specifying histone variant CENP-A and exhibits chromosome-wide centromeric activity (holocentric). The CCAN incorporates four previously uncharacterized centromeric subunit proteins that are structurally related to the Dam1/DASH complex but function in scaffolding the inner kinetochore rather than in microtubule binding. Similar to the yeast and human systems, the CCAN also entraps DNA within its central closed chamber. However, unlike these systems, the CCAN can also assemble in vitro into a self-contained head-to-head dimer via atypical histone-fold protein dimerization. On the basis of our findings, we propose that the holocentric organization may emerge from the modular arrangement of discrete kinetochore units. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_70568.map.gz | 231.9 MB | EMDB map data format | |
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| Header (meta data) | emd-70568-v30.xml emd-70568.xml | 40.9 KB 40.9 KB | Display Display | EMDB header |
| Images | emd_70568.png | 63.4 KB | ||
| Filedesc metadata | emd-70568.cif.gz | 9.7 KB | ||
| Others | emd_70568_additional_1.map.gz emd_70568_additional_2.map.gz emd_70568_additional_3.map.gz emd_70568_additional_4.map.gz | 230.2 MB 121.2 MB 229.9 MB 120.8 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-70568 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-70568 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9oklMC ![]() 9okbC ![]() 9okdC ![]() 9okeC ![]() 9okkC ![]() 77478 C: citing same article ( M: atomic model generated by this map |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Map
| File | Download / File: emd_70568.map.gz / Format: CCP4 / Size: 263.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Composite apo-bmCCAN map, sharpened | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. generated in cubic-lattice coordinate | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.838 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Additional map: Consensus apo-bmCCAN map, sharpened
| File | emd_70568_additional_1.map | ||||||||||||
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| Annotation | Consensus apo-bmCCAN map, sharpened | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Additional map: Consensus apo-bmCCAN map, unsharpened
| File | emd_70568_additional_2.map | ||||||||||||
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| Annotation | Consensus apo-bmCCAN map, unsharpened | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Additional map: Focused refinement of the bmCENP-HIK:T head groups, sharpened
| File | emd_70568_additional_3.map | ||||||||||||
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| Annotation | Focused refinement of the bmCENP-HIK:T head groups, sharpened | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Additional map: Focused refinement of the bmCENP-HIK:T head groups, unsharpened
| File | emd_70568_additional_4.map | ||||||||||||
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| Annotation | Focused refinement of the bmCENP-HIK:T head groups, unsharpened | ||||||||||||
| Projections & Slices |
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| Density Histograms |
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Sample components
+Entire : Bombyx mori CCAN dimer bound to DNA
+Supramolecule #1: Bombyx mori CCAN dimer bound to DNA
+Macromolecule #1: CS-1
+Macromolecule #2: CS-2
+Macromolecule #3: SFRICE_007223
+Macromolecule #4: CS-4
+Macromolecule #5: bm-CENPH
+Macromolecule #6: Centromere protein I
+Macromolecule #7: bmCENP-K
+Macromolecule #8: Centromere protein L
+Macromolecule #9: Centromere protein M
+Macromolecule #10: bmCENP-N
+Macromolecule #11: Centromere protein O
+Macromolecule #12: bmCENP-P
+Macromolecule #13: bmCENP-T
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Concentration | 1 mg/mL |
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| Buffer | pH: 7.5 |
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Processing
FIELD EMISSION GUN
