3AZH

Crystal Structure of Human Nucleosome Core Particle Containing H3K122Q mutation

Summary for 3AZH

• Entry DOI: 10.2210/pdb3azh/pdb
• Related: 3AFA 3AYW 3AZE 3AZF 3AZG 3AZI 3AZJ 3AZK 3AZL 3AZM 3AZN
• Descriptor: Histone H3.1, Histone H4, Histone H2A type 1-B/E, ... (7 entities in total)
• Functional Keywords: histone-fold, nucleosome, structural protein-dna complex, structural protein/dna
• Biological source: Homo sapiens (human); More
• Cellular location: Nucleus: P68431 P62805 P04908 P06899
• Total number of polymer chains: 10
• Total formula weight: 202994.20

Authors

Iwasaki, W.,Tachiwana, H.,Kawaguchi, K.,Shibata, T.,Kagawa, W.,Kurumizaka, H. (deposition date: 2011-05-25, release date: 2011-09-21, Last modification date: 2023-11-01)

Primary citation

Iwasaki, W.,Tachiwana, H.,Kawaguchi, K.,Shibata, T.,Kagawa, W.,Kurumizaka, H.
Comprehensive Structural Analysis of Mutant Nucleosomes Containing Lysine to Glutamine (KQ) Substitutions in the H3 and H4 Histone-Fold Domains
Biochemistry, 50:7822-7832, 2011

PubMed Abstract: Post-translational modifications (PTMs) of histones play important roles in regulating the structure and function of chromatin in eukaryotes. Although histone PTMs were considered to mainly occur at the N-terminal tails of histones, recent studies have revealed that PTMs also exist in the histone-fold domains, which are commonly shared among the core histones H2A, H2B, H3, and H4. The lysine residue is a major target for histone PTM, and the lysine to glutamine (KQ) substitution is known to mimic the acetylated states of specific histone lysine residues in vivo. Human histones H3 and H4 contain 11 lysine residues in their histone-fold domains (five for H3 and six for H4), and eight of these lysine residues are known to be targets for acetylation. In the present study, we prepared 11 mutant nucleosomes, in which each of the lysine residues of the H3 and H4 histone-fold domains was replaced by glutamine: H3 K56Q, H3 K64Q, H3 K79Q, H3 K115Q, H3 K122Q, H4 K31Q, H4 K44Q, H4 K59Q, H4 K77Q, H4 K79Q, and H4 K91Q. The crystal structures of these mutant nucleosomes were determined at 2.4-3.5 Å resolutions. Some of these amino acid substitutions altered the local protein-DNA interactions and the interactions between amino acid residues within the nucleosome. Interestingly, the C-terminal region of H2A was significantly disordered in the nucleosome containing H4 K44Q. These results provide an important structural basis for understanding how histone modifications and mutations affect chromatin structure and function.

PubMed: 21812398
DOI: 10.1021/bi201021h

Experimental method

X-RAY DIFFRACTION (3.49 Å)