3TW1

Structure of Rtt106-AHN

3TW1 の概要

• エントリーDOI: 10.2210/pdb3tw1/pdb
• 関連するPDBエントリー: 3FSS 3HKH 3TVV
• 分子名称: Histone chaperone RTT106, N-[2-(1H-IMIDAZOL-4-YL)ETHYL]ACETAMIDE, GLYCEROL, ... (4 entities in total)
• 機能のキーワード: tandem pleckstrin-homology domains, chromosomal protein, nucleus, phosphoprotein, transcription, transcription regulation, chaperone
• 由来する生物種: Saccharomyces cerevisiae (yeast)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 27855.23

構造登録者

Su, D.,Thompson, J.R.,Mer, G. (登録日: 2011-09-21, 公開日: 2012-02-01, 最終更新日: 2024-10-16)

主引用文献

Su, D.,Hu, Q.,Li, Q.,Thompson, J.R.,Cui, G.,Fazly, A.,Davies, B.A.,Botuyan, M.V.,Zhang, Z.,Mer, G.
Structural basis for recognition of H3K56-acetylated histone H3-H4 by the chaperone Rtt106.
Nature, 483:104-107, 2012

PubMed Abstract: Dynamic variations in the structure of chromatin influence virtually all DNA-related processes in eukaryotes and are controlled in part by post-translational modifications of histones. One such modification, the acetylation of lysine 56 (H3K56ac) in the amino-terminal α-helix (αN) of histone H3, has been implicated in the regulation of nucleosome assembly during DNA replication and repair, and nucleosome disassembly during gene transcription. In Saccharomyces cerevisiae, the histone chaperone Rtt106 contributes to the deposition of newly synthesized H3K56ac-carrying H3-H4 complex on replicating DNA, but it is unclear how Rtt106 binds H3-H4 and specifically recognizes H3K56ac as there is no apparent acetylated lysine reader domain in Rtt106. Here, we show that two domains of Rtt106 are involved in a combinatorial recognition of H3-H4. An N-terminal domain homodimerizes and interacts with H3-H4 independently of acetylation while a double pleckstrin-homology (PH) domain binds the K56-containing region of H3. Affinity is markedly enhanced upon acetylation of K56, an effect that is probably due to increased conformational entropy of the αN helix of H3. Our data support a mode of interaction where the N-terminal homodimeric domain of Rtt106 intercalates between the two H3-H4 components of the (H3-H4)(2) tetramer while two double PH domains in the Rtt106 dimer interact with each of the two H3K56ac sites in (H3-H4)(2). We show that the Rtt106-(H3-H4)(2) interaction is important for gene silencing and the DNA damage response.

PubMed: 22307274
DOI: 10.1038/nature10861

実験手法

X-RAY DIFFRACTION (1.772 Å)