6JPQ

CryoEM structure of Abo1 hexamer - ADP complex

Summary for 6JPQ

• Entry DOI: 10.2210/pdb6jpq/pdb
• EMDB information: 0800 9870 9871 9872
• Descriptor: Uncharacterized AAA domain-containing protein C31G5.19 (1 entity in total)
• Functional Keywords: aaa+ atpase histone chaperone, chaperone
• Biological source: Schizosaccharomyces pombe (strain 972 / ATCC 24843) (Fission yeast)
• Total number of polymer chains: 6
• Total formula weight: 817364.63

Authors

Cho, C.,Jang, J.,Song, J.J. (deposition date: 2019-03-27, release date: 2020-08-19, Last modification date: 2024-03-27)

Primary citation

Cho, C.,Jang, J.,Kang, Y.,Watanabe, H.,Uchihashi, T.,Kim, S.J.,Kato, K.,Lee, J.Y.,Song, J.J.
Structural basis of nucleosome assembly by the Abo1 AAA+ ATPase histone chaperone.
Nat Commun, 10:5764-5764, 2019

PubMed Abstract: The fundamental unit of chromatin, the nucleosome, is an intricate structure that requires histone chaperones for assembly. ATAD2 AAA+ ATPases are a family of histone chaperones that regulate nucleosome density and chromatin dynamics. Here, we demonstrate that the fission yeast ATAD2 homolog, Abo1, deposits histone H3-H4 onto DNA in an ATP-hydrolysis-dependent manner by in vitro reconstitution and single-tethered DNA curtain assays. We present cryo-EM structures of an ATAD2 family ATPase to atomic resolution in three different nucleotide states, revealing unique structural features required for histone loading on DNA, and directly visualize the transitions of Abo1 from an asymmetric spiral (ATP-state) to a symmetric ring (ADP- and apo-states) using high-speed atomic force microscopy (HS-AFM). Furthermore, we find that the acidic pore of ATP-Abo1 binds a peptide substrate which is suggestive of a histone tail. Based on these results, we propose a model whereby Abo1 facilitates H3-H4 loading by utilizing ATP.

PubMed: 31848341
DOI: 10.1038/s41467-019-13743-9

Experimental method

ELECTRON MICROSCOPY (4.44 Å)