|Entry||Database: EMDB / ID: EMD-10158|
|Title||Class 1B : CENP-A nucleosome|
|Sample||Class 1B : CENP-A nucleosome|
|Function / homology|
Function and homology information
inner kinetochore / kinetochore assembly / condensed chromosome, centromeric region / protein localization to chromosome, centromeric region / kinetochore => GO:0000776 / establishment of mitotic spindle orientation / negative regulation of megakaryocyte differentiation / Packaging Of Telomere Ends / depurination / positive regulation of histone exchange ...inner kinetochore / kinetochore assembly / condensed chromosome, centromeric region / protein localization to chromosome, centromeric region / kinetochore => GO:0000776 / establishment of mitotic spindle orientation / negative regulation of megakaryocyte differentiation / Packaging Of Telomere Ends / depurination / positive regulation of histone exchange / CENP-A containing chromatin assembly / chromosome, centromeric region / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / Deposition of new CENPA-containing nucleosomes at the centromere / negative regulation of DNA recombination at telomere / DNA replication-independent chromatin assembly / mitotic cytokinesis / pericentric heterochromatin / telomere capping / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / Inhibition of DNA recombination at telomere / Cleavage of the damaged pyrimidine / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Meiotic synapsis / Mitotic Prometaphase / EML4 and NUDC in mitotic spindle formation / heterochromatin assembly => GO:0031507 / telomere organization / RNA Polymerase I Promoter Opening / SUMOylation of chromatin organization proteins / DNA replication-dependent chromatin assembly / Resolution of Sister Chromatid Cohesion / DNA methylation / HCMV Late Events / innate immune response in mucosa / rDNA heterochromatin assembly / SIRT1 negatively regulates rRNA expression / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / Condensation of Prophase Chromosomes / PRC2 methylates histones and DNA / negative regulation of gene expression, epigenetic / RNA Polymerase I Promoter Escape / mitotic chromosome condensation / regulation of gene silencing by miRNA / HDACs deacetylate histones / nuclear chromosome / RHO GTPases Activate Formins / Transcriptional regulation by small RNAs / Nonhomologous End-Joining (NHEJ) / NoRC negatively regulates rRNA expression / Formation of the beta-catenin:TCF transactivating complex / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / B-WICH complex positively regulates rRNA expression / regulation of megakaryocyte differentiation / DNA-templated transcription, initiation / Metalloprotease DUBs / nucleosome assembly / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / DNA Damage/Telomere Stress Induced Senescence / RMTs methylate histone arginines / G2/M DNA damage checkpoint / HCMV Early Events / mitotic spindle organization / regulation of androgen receptor signaling pathway / Pre-NOTCH Transcription and Translation / HDMs demethylate histones / PKMTs methylate histone lysines / Meiotic recombination / nucleosome / Activation of anterior HOX genes in hindbrain development during early embryogenesis / UCH proteinases / Transcriptional regulation of granulopoiesis / Separation of Sister Chromatids / E3 ubiquitin ligases ubiquitinate target proteins / RUNX1 regulates transcription of genes involved in differentiation of HSCs / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / double-strand break repair / double-strand break repair via nonhomologous end joining / Processing of DNA double-strand break ends / HATs acetylate histones / Senescence-Associated Secretory Phenotype (SASP) / chromosome, telomeric region / viral life cycle / Oxidative Stress Induced Senescence / antibacterial humoral response / Estrogen-dependent gene expression / antimicrobial humoral immune response mediated by antimicrobial peptide / Ub-specific processing proteases / protein ubiquitination / defense response to Gram-positive bacterium / protein heterodimerization activity / Amyloid fiber formation / amyloid fibril formation / protein domain specific binding / chromatin binding / viral process / protein-containing complex / RNA binding / DNA binding
Similarity search - Function
Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A signature. / Histone H2A conserved site / C-terminus of histone H2A / Histone H2A, C-terminal domain / Histone H2A / Histone 2A / Histone H4, conserved site ...Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A signature. / Histone H2A conserved site / C-terminus of histone H2A / Histone H2A, C-terminal domain / Histone H2A / Histone 2A / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF) / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 / Histone-fold
Similarity search - Domain/homology
Histone H3-like centromeric protein A / Histone H4 / Histone H2B type 1-C/E/F/G/I / Histone H2A type 2-A
Similarity search - Component
|Biological species||Homo sapiens (human)|
|Method||single particle reconstruction / cryo EM / Resolution: 4.4 Å|
|Authors||Ali-Ahmad A / Bilokapic S / Halic M / Sekulic N|
|Funding support|| Norway, Germany, 2 items |
|Citation||Journal: EMBO Rep / Year: 2019|
Title: CENP-C unwraps the human CENP-A nucleosome through the H2A C-terminal tail.
Authors: Ahmad Ali-Ahmad / Silvija Bilokapić / Ingmar B Schäfer / Mario Halić / Nikolina Sekulić /
Abstract: Centromeres are defined epigenetically by nucleosomes containing the histone H3 variant CENP-A, upon which the constitutive centromere-associated network of proteins (CCAN) is built. CENP-C is ...Centromeres are defined epigenetically by nucleosomes containing the histone H3 variant CENP-A, upon which the constitutive centromere-associated network of proteins (CCAN) is built. CENP-C is considered to be a central organizer of the CCAN. We provide new molecular insights into the structure of human CENP-A nucleosomes, in isolation and in complex with the CENP-C central region (CENP-C ), the main CENP-A binding module of human CENP-C. We establish that the short αN helix of CENP-A promotes DNA flexibility at the nucleosome ends, independently of the sequence it wraps. Furthermore, we show that, in vitro, two regions of human CENP-C (CENP-C and CENP-C ) both bind exclusively to the CENP-A nucleosome. We find CENP-C to bind with high affinity due to an extended hydrophobic area made up of CENP-A and CENP-A . Importantly, we identify two key conformational changes within the CENP-A nucleosome upon CENP-C binding. First, the loose DNA wrapping of CENP-A nucleosomes is further exacerbated, through destabilization of the H2A C-terminal tail. Second, CENP-C rigidifies the N-terminal tail of H4 in the conformation favoring H4 monomethylation, essential for a functional centromere.
|Structure viewer||EM map: |
Downloads & links
|File||Download / File: emd_10158.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)|
|Projections & slices|
Images are generated by Spider.
|Voxel size||X=Y=Z: 1.06 Å|
|Symmetry||Space group: 1|
CCP4 map header:
-Entire Class 1B : CENP-A nucleosome
|Entire||Name: Class 1B : CENP-A nucleosome / Number of Components: 1|
-Component #1: protein, Class 1B : CENP-A nucleosome
|Protein||Name: Class 1B : CENP-A nucleosome / Recombinant expression: No|
|Source||Species: Homo sapiens (human)|
|Source (engineered)||Expression System: Escherichia coli (E. coli)|
|Specimen||Specimen State: Particle / Method: cryo EM|
|Sample solution||Specimen conc.: 1.2 mg/mL / pH: 7.5|
|Vitrification||Cryogen Name: ETHANE|
-Electron microscopy imaging
Model: Titan Krios / Image courtesy: FEI Company
|Imaging||Microscope: FEI TITAN KRIOS|
|Electron gun||Electron Source: FIELD EMISSION GUN / Accelerating Voltage: 300 kV / Electron Dose: 100 e/Å2 / Illumination Mode: FLOOD BEAM|
|Lens||Imaging Mode: BRIGHT FIELD|
|Specimen Holder||Model: OTHER|
|Camera||Detector: GATAN K2 SUMMIT (4k x 4k)|
|Processing||Method: single particle reconstruction / Applied Symmetry: C1 (asymmetric) / Number of Projections: 47000|
|3D reconstruction||Resolution: 4.4 Å / Resolution Method: FSC 0.143 CUT-OFF|
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