6YWW image
Entry Detail
PDB ID:
6YWW
Title:
MeCP2 is a microsatellite binding protein that protects CA repeats from nucleosome invasion
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2020-04-30
Release Date:
2021-06-16
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Truncated methyl CpG binding protein 2 transcript 1
Chain IDs:A
Chain Length:101
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Description:DNA/RNA (5'-D(*TP*CP*TP*GP*CP*AP*CP*A)-R(P*(5HC))-D(P*AP*CP*AP*CP*AP*AP*TP*TP*AP*TP*A)-3')
Chain IDs:B
Chain Length:20
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*AP*TP*AP*TP*AP*AP*TP*TP*GP*TP*GP*TP*GP*TP*GP*TP*GP*CP*AP*G)-3')
Chain IDs:C
Chain Length:20
Number of Molecules:1
Biological Source:synthetic construct
Primary Citation
MeCP2 is a microsatellite binding protein that protects CA repeats from nucleosome invasion.
Science 372 ? ? (2021)
PMID: 34324427 DOI: 10.1126/science.abd5581

Abstact

The Rett syndrome protein MeCP2 was described as a methyl-CpG-binding protein, but its exact function remains unknown. Here we show that mouse MeCP2 is a microsatellite binding protein that specifically recognizes hydroxymethylated CA repeats. Depletion of MeCP2 alters chromatin organization of CA repeats and lamina-associated domains and results in nucleosome accumulation on CA repeats and genome-wide transcriptional dysregulation. The structure of MeCP2 in complex with a hydroxymethylated CA repeat reveals a characteristic DNA shape, with considerably modified geometry at the 5-hydroxymethylcytosine, which is recognized specifically by Arg133, a key residue whose mutation causes Rett syndrome. Our work identifies MeCP2 as a microsatellite DNA binding protein that targets the 5hmC-modified CA-rich strand and maintains genome regions nucleosome-free, suggesting a role for MeCP2 dysfunction in Rett syndrome.

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Primary Citation of related structures