7MBM image
Entry Detail
PDB ID:
7MBM
EMDB ID:
Title:
Cryo-EM structure of MLL1-NCP (H3K4M) complex, mode01
Biological Source:
PDB Version:
Deposition Date:
2021-04-01
Release Date:
2021-12-29
Method Details:
Experimental Method:
Resolution:
4.76 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Retinoblastoma-binding protein 5
Chain IDs:A
Chain Length:538
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:WD repeat-containing protein 5
Chain IDs:B
Chain Length:313
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Histone-lysine N-methyltransferase 2A
Chain IDs:C
Chain Length:209
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Set1/Ash2 histone methyltransferase complex subunit ASH2
Chain IDs:D
Chain Length:534
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Histone H3
Chain IDs:E (auth: G), I (auth: K)
Chain Length:136
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polypeptide(L)
Description:Histone H4
Chain IDs:F (auth: H), J (auth: L)
Chain Length:103
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polypeptide(L)
Description:Histone H2A
Chain IDs:G (auth: I), K (auth: M)
Chain Length:129
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polypeptide(L)
Description:Histone H2B 1.1
Chain IDs:H (auth: J), L (auth: N)
Chain Length:123
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polydeoxyribonucleotide
Description:DNA (145-MER)
Chain IDs:M (auth: O)
Chain Length:147
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Description:DNA (145-MER)
Chain IDs:N (auth: P)
Chain Length:147
Number of Molecules:1
Biological Source:synthetic construct
Ligand Molecules
Primary Citation
Regulation of MLL1 Methyltransferase Activity in Two Distinct Nucleosome Binding Modes.
Biochemistry 61 1 9 (2022)
PMID: 34928138 DOI: 10.1021/acs.biochem.1c00603

Abstact

Cryo-EM structures of the KMT2A/MLL1 core complex bound on nucleosome core particles (NCPs) suggest unusual rotational dynamics of the MLL1 complex approaching its physiological substrate. However, the functional implication of such dynamics remains unclear. Here, we show that the MLL1 core complex also shows high rotational dynamics bound on the NCP carrying the catalytically inert histone H3 lysine 4 to methionine (K4M) mutation. There are two major binding modes of the MLL1 complex on the NCPK4M. Importantly, disruption of only one of the binding modes compromised the overall MLL1 activity in an NCP-specific manner. We propose that the MLL1 core complex probably exists in an equilibrium of poised and active binding modes. The high rotational dynamics of the MLL1 complex on the NCP is a feature that can be exploited for loci-specific regulation of H3K4 methylation in higher eukaryotes.

Legend

Protein

Chemical

Disease

Primary Citation of related structures