Structure of the histone chaperone asf1 bound to the histone h3 C-terminal helix and functional insights.Agez, M., Chen, J., Guerois, R., van Heijenoort, C., Thuret, J.Y., Mann, C., Ochsenbein, F.
(2007) Structure 15: 191-199
- PubMed: 17292837
- DOI: https://doi.org/10.1016/j.str.2007.01.002
- Primary Citation of Related Structures:
- PubMed Abstract:
Asf1 is a histone chaperone that favors histone H3/H4 assembly and disassembly. We solved the structure of the conserved domain of human ASF1A in complex with the C-terminal helix of histone H3 using nuclear magnetic resonance spectroscopy. This structure is fully compatible with an association of ASF1 with the heterodimeric form of histones H3/H4. In our model, ASF1 substitutes for the second H3/H4 heterodimer that is normally found in heterotetrameric H3/H4 complexes. This result constitutes an essential step in the fundamental understanding of the mechanisms of nucleosome assembly by histone chaperones. Point mutations that perturb the Asf1/histone interface were designed from the structure. The decreased binding affinity of the Asf1-H3/H4 complex correlates with decreased levels of H3-K56 acetylation and phenotypic defects in vivo.
Institut de Biologie et de Technologie de Saclay, Commissariat à l'Energie Atomique/Saclay, F-91191 Gif-sur-Yvette Cedex, France.