| Structural highlights
Function
[H2AZ_HUMAN] Variant histone H2A which replaces conventional H2A in a subset of nucleosomes. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling. May be involved in the formation of constitutive heterochromatin. May be required for chromosome segregation during cell division.[1] [VPS72_HUMAN] Could be a DNA-binding transcriptional regulator. May be involved in chromatin modification and remodeling. [H2B1J_HUMAN] Core component of nucleosome. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling.[2] [3] [4] Has broad antibacterial activity. May contribute to the formation of the functional antimicrobial barrier of the colonic epithelium, and to the bactericidal activity of amniotic fluid.[5] [6] [7]
Publication Abstract from PubMed
H2A.Z, a widely conserved histone variant, is evicted from chromatin by the histone chaperone ANP32E. However, to date, no deposition chaperone for H2A.Z is known in metazoans. Here, we identify YL1 as a specific H2A.Z-deposition chaperone. The 2.7-A-resolution crystal structure of the human YL1-H2A.Z-H2B complex shows that YL1 binding, similarly to ANP32E binding, triggers an extension of the H2A.Z alphaC helix. The interaction with YL1 is, however, more extensive and includes both the extended acidic patch and the entire DNA-binding surface of H2A.Z-H2B. Substitution of only four amino acid residues of H2A is sufficient for the formation of an H2A.Z-like interface specifically recognized by YL1. Collectively, our data reveal the molecular basis of H2A.Z-specific recognition by YL1 and shed light on the mechanism of H2A.Z transfer to the nucleosome by the ATP-dependent chromatin-remodeling complexes SRCAP and P400-TIP60.
Molecular basis and specificity of H2A.Z-H2B recognition and deposition by the histone chaperone YL1.,Latrick CM, Marek M, Ouararhni K, Papin C, Stoll I, Ignatyeva M, Obri A, Ennifar E, Dimitrov S, Romier C, Hamiche A Nat Struct Mol Biol. 2016 Apr;23(4):309-16. doi: 10.1038/nsmb.3189. Epub 2016 Mar, 14. PMID:26974126[8]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Farris SD, Rubio ED, Moon JJ, Gombert WM, Nelson BH, Krumm A. Transcription-induced chromatin remodeling at the c-myc gene involves the local exchange of histone H2A.Z. J Biol Chem. 2005 Jul 1;280(26):25298-303. Epub 2005 May 6. PMID:15878876 doi:http://dx.doi.org/10.1074/jbc.M501784200
- ↑ Kim HS, Cho JH, Park HW, Yoon H, Kim MS, Kim SC. Endotoxin-neutralizing antimicrobial proteins of the human placenta. J Immunol. 2002 Mar 1;168(5):2356-64. PMID:11859126
- ↑ Tollin M, Bergman P, Svenberg T, Jornvall H, Gudmundsson GH, Agerberth B. Antimicrobial peptides in the first line defence of human colon mucosa. Peptides. 2003 Apr;24(4):523-30. PMID:12860195
- ↑ Howell SJ, Wilk D, Yadav SP, Bevins CL. Antimicrobial polypeptides of the human colonic epithelium. Peptides. 2003 Nov;24(11):1763-70. PMID:15019208 doi:10.1016/j.peptides.2003.07.028
- ↑ Kim HS, Cho JH, Park HW, Yoon H, Kim MS, Kim SC. Endotoxin-neutralizing antimicrobial proteins of the human placenta. J Immunol. 2002 Mar 1;168(5):2356-64. PMID:11859126
- ↑ Tollin M, Bergman P, Svenberg T, Jornvall H, Gudmundsson GH, Agerberth B. Antimicrobial peptides in the first line defence of human colon mucosa. Peptides. 2003 Apr;24(4):523-30. PMID:12860195
- ↑ Howell SJ, Wilk D, Yadav SP, Bevins CL. Antimicrobial polypeptides of the human colonic epithelium. Peptides. 2003 Nov;24(11):1763-70. PMID:15019208 doi:10.1016/j.peptides.2003.07.028
- ↑ Latrick CM, Marek M, Ouararhni K, Papin C, Stoll I, Ignatyeva M, Obri A, Ennifar E, Dimitrov S, Romier C, Hamiche A. Molecular basis and specificity of H2A.Z-H2B recognition and deposition by the histone chaperone YL1. Nat Struct Mol Biol. 2016 Apr;23(4):309-16. doi: 10.1038/nsmb.3189. Epub 2016 Mar, 14. PMID:26974126 doi:http://dx.doi.org/10.1038/nsmb.3189
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