3ask

Structure of UHRF1 in complex with histone tail

spinqualitylabelsall models 3ask, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ask is a 7 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ZN NonStd Res: M3L Related: 3fl2, 3db3, 2zkd, 2zo0, 3clz, 2faz, 3asl Gene: UHRF1 (HUMAN) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease [UHRF1_HUMAN] Note=Defects in UHRF1 may be a cause of cancers. Overexpressed in many different forms of human cancers, including bladder, breast, cervical, colorectal and prostate cancers, as well as pancreatic adenocarcinomas, rhabdomyosarcomas and gliomas. Plays an important role in the correlation of histone modification and gene silencing in cancer progression. Expression is associated with a poor prognosis in patients with various cancers, suggesting that it participates in cancer progression. Function [UHRF1_HUMAN] Multidomain protein that acts as a key epigenetic regulator by bridging DNA methylation and chromatin modification. Specifically recognizes and binds hemimethylated DNA at replication forks via its YDG domain and recruits DNMT1 methyltransferase to ensure faithful propagation of the DNA methylation patterns through DNA replication. In addition to its role in maintenance of DNA methylation, also plays a key role in chromatin modification: through its tudor-like regions and PHD-type zinc fingers, specifically recognizes and binds histone H3 trimethylated at 'Lys-9' (H3K9me3) and unmethylated at 'Arg-2' (H3R2me0), respectively, and recruits chromatin proteins. Enriched in pericentric heterochromatin where it recruits different chromatin modifiers required for this chromatin replication. Also localizes to euchromatic regions where it negatively regulates transcription possibly by impacting DNA methylation and histone modifications. Has E3 ubiquitin-protein ligase activity by mediating the ubiquitination of target proteins such as histone H3 and PML. It is still unclear how E3 ubiquitin-protein ligase activity is related to its role in chromatin in vivo. May be involved in DNA repair. Publication Abstract from PubMed Multiple covalent modifications on a histone tail are often recognized by linked histone reader modules. UHRF1 [ubiquitin-like, containing plant homeodomain (PHD) and really interesting new gene (RING) finger domains 1], an essential factor for maintenance of DNA methylation, contains linked two-histone reader modules, a tandem Tudor domain and a PHD finger, tethered by a 17-aa linker, and has been implicated to link histone modifications and DNA methylation. Here, we present the crystal structure of the linked histone reader modules of UHRF1 in complex with the amino-terminal tail of histone H3. Our structural and biochemical data provide the basis for combinatorial readout of unmodified Arg-2 (H3-R2) and methylated Lys-9 (H3-K9) by the tandem tudor domain and the PHD finger. The structure reveals that the intermodule linker plays an essential role in the formation of a histone H3-binding hole between the reader modules by making extended contacts with the tandem tudor domain. The histone H3 tail fits into the hole by adopting a compact fold harboring a central helix, which allows both of the reader modules to simultaneously recognize the modification states at H3-R2 and H3-K9. Our data also suggest that phosphorylation of a linker residue can modulate the relative position of the reader modules, thereby altering the histone H3-binding mode. This finding implies that the linker region plays a role as a functional switch of UHRF1 involved in multiple regulatory pathways such as maintenance of DNA methylation and transcriptional repression. Recognition of modification status on a histone H3 tail by linked histone reader modules of the epigenetic regulator UHRF1.,Arita K, Isogai S, Oda T, Unoki M, Sugita K, Sekiyama N, Kuwata K, Hamamoto R, Tochio H, Sato M, Ariyoshi M, Shirakawa M Proc Natl Acad Sci U S A. 2012 Aug 7;109(32):12950-5. Epub 2012 Jul 25. PMID:22837395 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ubiquitin protein ligase

Proteopedia Page Contributors and Editors (what is this?)

OCA