1roc

Crystal structure of the histone deposition protein Asf1

spinqualitylabelsall models 1roc, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1roc is a 1 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BR Gene: ASF1, YJL115W, J0755 (ATCC 18824) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ASF1_YEAST] Histone chaperone that facilitates histone deposition and histone exchange and removal during nucleosome assembly and disassembly. Facilitates histone deposition through both replication-dependent and replication-independent chromatin assembly pathways. Cooperates with chromatin assembly factor 1 (CAF-1) to promote replication-dependent chromatin assembly and with the HIR complex to promote replication-independent chromatin assembly, which may occur during transcription and DNA repair. May be required for the maintenance of a subset of replication elongation factors, including DNA polymerase epsilon, the RFC complex and PCNA, at stalled replication forks. Also required for acetylation of histone H3 on 'Lys-9' and 'Lys-56'. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: Asf1 is a ubiquitous eukaryotic histone binding and deposition protein that mediates nucleosome formation in vitro and is required for genome stability in vivo. Studies in a variety of organisms have defined Asf1's role as a histone chaperone during DNA replication through specific interactions with histones H3/H4 and the histone deposition factor CAF-I. In addition to its role in replication, conserved interactions with proteins involved in chromatin silencing, transcription, chromatin remodeling, and DNA repair have also established Asf1 as an important component of a number of chromatin assembly and modulation complexes. RESULTS: We demonstrate that the highly conserved N-terminal domain of S. cerevisiae Asf1 (Asf1N) is the core region that mediates all tested functions of the full-length protein. The crystal structure of this core domain, determined to 1.5 A resolution, reveals a compact immunoglobulin-like beta sandwich fold topped by three helical linkers. The surface of Asf1 displays a conserved hydrophobic groove flanked on one side by an area of strong electronegative surface potential. These regions represent potential binding sites for histones and other interacting proteins. The structural model also allowed us to interpret mutagenesis studies of the human Asf1a/HIRA interaction and to functionally define the region of Asf1 responsible for Hir1-dependent telomeric silencing in budding yeast. CONCLUSIONS: The evolutionarily conserved, N-terminal 155 amino acids of histone deposition protein Asf1 are functional in vitro and in vivo. This core region of Asf1 adopts a compact immunoglobulin-fold structure with distinct surface characteristics, including a Hir protein binding region required for gene silencing. Structure and function of the conserved core of histone deposition protein Asf1.,Daganzo SM, Erzberger JP, Lam WM, Skordalakes E, Zhang R, Franco AA, Brill SJ, Adams PD, Berger JM, Kaufman PD Curr Biol. 2003 Dec 16;13(24):2148-58. PMID:14680630 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Anti-silencing factor Anti-silencing factor 3D structures

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