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Molecular basis of chromatin remodelling by DDM1 involved in plant DNA methylation.

Yue LiuZhihui ZhangHongmiao HuWei ChenFan ZhangQian WangChangshi WangKaige YanJiamu Du
Published in: Nature plants (2024)
Eukaryotic gene regulation occurs at the chromatin level, which requires changing the chromatin structure by a group of ATP-dependent DNA translocases-namely, the chromatin remodellers 1 . In plants, chromatin remodellers function in various biological processes and possess both conserved and plant-specific components 2-5 . DECREASE IN DNA METHYLATION 1 (DDM1) is a plant chromatin remodeller that plays a key role in the maintenance DNA methylation 6-11 . Here we determined the structures of Arabidopsis DDM1 in complex with nucleosome in ADP-BeF x -bound, ADP-bound and nucleotide-free conformations. We show that DDM1 specifically recognizes the H4 tail and nucleosomal DNA. The conformational differences between ADP-BeF x -bound, ADP-bound and nucleotide-free DDM1 suggest a chromatin remodelling cycle coupled to ATP binding, hydrolysis and ADP release. This, in turn, triggers conformational changes in the DDM1-bound nucleosomal DNA, which alters the nucleosome structure and promotes DNA sliding. Together, our data reveal the molecular basis of chromatin remodelling by DDM1.
Keyphrases
  • genome wide
  • dna methylation
  • gene expression
  • transcription factor
  • dna damage
  • single molecule
  • circulating tumor
  • cell free
  • machine learning
  • oxidative stress
  • high resolution
  • living cells
  • fluorescent probe