8J6T image
Entry Detail
PDB ID:
8J6T
EMDB ID:
EMD-36014
Keywords:
REPLICATION/DNA
Title:
Cryo-EM structure of the double CAF-1 bound right-handed Di-tetrasome
Biological Source:
Source Organism:
Homo sapiens, synthetic construct
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
2023-04-26
Release Date:
2023-08-16
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
6.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
8J6T validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Histone H3.1
Chain IDs:A (auth: G), C (auth: E), F (auth: C), H (auth: A)
Chain Length:136
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:P68431 Pfam ID:PF00125
Protein Blast
Polymer Type:polypeptide(L)
Description:Histone H4
Chain IDs:B (auth: H), D (auth: F), G (auth: D), I (auth: B)
Chain Length:103
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:P62805 Pfam ID:PF15511
Polymer Type:polydeoxyribonucleotide
Description:Widom 601 DNA (147-MER)
Chain IDs:E (auth: I)
Chain Length:147
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Description:Widom 601 DNA (147-MER)
Chain IDs:J
Chain Length:147
Number of Molecules:1
Biological Source:synthetic construct
Protein Blast
Polymer Type:polypeptide(L)
Description:Chromatin assembly factor 1 subunit A
Chain IDs:K, M
Chain Length:956
Number of Molecules:2
Biological Source:Homo sapiens
UniProt ID:Q13111 Pfam ID:PF15557, PF11600, PF12253, PF15539
Protein Blast
Polymer Type:polypeptide(L)
Description:Chromatin assembly factor 1 subunit B
Chain IDs:L, N
Chain Length:559
Number of Molecules:2
Biological Source:Homo sapiens
UniProt ID:Q13112 Pfam ID:PF00400, PF15512
Ligand Molecules
NA
Primary Citation
Structural insights into histone binding and nucleosome assembly by chromatin assembly factor-1.
Science 381 eadd8673 eadd8673 (2023)
PMID: 37616371 DOI: 10.1126/science.add8673

Abstact

Chromatin inheritance entails de novo nucleosome assembly after DNA replication by chromatin assembly factor-1 (CAF-1). Yet direct knowledge about CAF-1's histone binding mode and nucleosome assembly process is lacking. In this work, we report the crystal structure of human CAF-1 in the absence of histones and the cryo-electron microscopy structure of CAF-1 in complex with histones H3 and H4. One histone H3-H4 heterodimer is bound by one CAF-1 complex mainly through the p60 subunit and the acidic domain of the p150 subunit. We also observed a dimeric CAF-1-H3-H4 supercomplex in which two H3-H4 heterodimers are poised for tetramer assembly and discovered that CAF-1 facilitates right-handed DNA wrapping of H3-H4 tetramers. These findings signify the involvement of DNA in H3-H4 tetramer formation and suggest a right-handed nucleosome precursor in chromatin replication.

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Primary Citation of related structures
8J6T