7BP2 image
Deposition Date 2020-03-21
Release Date 2020-11-11
Last Version Date 2023-11-29
Entry Detail
PDB ID:
7BP2
Keywords:
Title:
Structural mechanism directing nucleosome reorganization by NAP1-RELATED PROTEIN 1 (NRP1)
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.58 Å
R-Value Free:
0.18
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 31
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Histone H2A.6
Gene (Uniprot):RAT5
Chain IDs:A, C
Chain Length:93
Number of Molecules:2
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Molecule:Histone H2B.1
Gene (Uniprot):F24B9.10
Chain IDs:B, D
Chain Length:98
Number of Molecules:2
Biological Source:Arabidopsis thaliana
Primary Citation
NAP1-Related Protein 1 (NRP1) has multiple interaction modes for chaperoning histones H2A-H2B.
Proc.Natl.Acad.Sci.USA 117 30391 30399 (2020)
PMID: 33199628 DOI: 10.1073/pnas.2011089117

Abstact

Nucleosome Assembly Protein 1 (NAP1) family proteins are evolutionarily conserved histone chaperones that play important roles in diverse biological processes. In this study, we determined the crystal structure of Arabidopsis NAP1-Related Protein 1 (NRP1) complexed with H2A-H2B and uncovered a previously unknown interaction mechanism in histone chaperoning. Both in vitro binding and in vivo plant rescue assays proved that interaction mediated by the N-terminal α-helix (αN) domain is essential for NRP1 function. In addition, the C-terminal acidic domain (CTAD) of NRP1 binds to H2A-H2B through a conserved mode similar to other histone chaperones. We further extended previous knowledge of the NAP1-conserved earmuff domain by mapping the amino acids of NRP1 involved in association with H2A-H2B. Finally, we showed that H2A-H2B interactions mediated by αN, earmuff, and CTAD domains are all required for the effective chaperone activity of NRP1. Collectively, our results reveal multiple interaction modes of a NAP1 family histone chaperone and shed light on how histone chaperones shield H2A-H2B from nonspecific interaction with DNA.

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Primary Citation of related structures