Publication Date:
2012-02-07
Description:
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 alpha-helix (alphaN) 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 alphaN 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.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3439842/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3439842/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Su, Dan -- Hu, Qi -- Li, Qing -- Thompson, James R -- Cui, Gaofeng -- Fazly, Ahmed -- Davies, Brian A -- Botuyan, Maria Victoria -- Zhang, Zhiguo -- Mer, Georges -- P50 CA108961/CA/NCI NIH HHS/ -- R01 CA132878/CA/NCI NIH HHS/ -- R01 CA132878-04/CA/NCI NIH HHS/ -- R01 GM072719/GM/NIGMS NIH HHS/ -- England -- Nature. 2012 Feb 5;483(7387):104-7. doi: 10.1038/nature10861.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota 55905, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22307274" target="_blank"〉PubMed〈/a〉
Keywords:
Acetylation
;
Animals
;
Binding Sites
;
Crystallography, X-Ray
;
DNA Damage
;
Gene Silencing
;
Genomic Instability
;
Histones/*chemistry/*metabolism
;
Lysine/analogs & derivatives/chemistry/metabolism
;
Magnetic Resonance Spectroscopy
;
Models, Molecular
;
Molecular Chaperones/*chemistry/genetics/*metabolism
;
Mutation/genetics
;
Pliability
;
Protein Binding
;
Protein Multimerization
;
Protein Structure, Tertiary
;
Saccharomyces cerevisiae/*chemistry
;
Saccharomyces cerevisiae Proteins/*chemistry/genetics/*metabolism
;
Structure-Activity Relationship
;
Substrate Specificity
;
Xenopus laevis
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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