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4qbm

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Revision as of 18:35, 1 February 2017

Crystal structure of human BAZ2A bromodomain in complex with a diacetylated histone 4 peptide (H4K16acK20ac)

Structural highlights

4qbm is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
NonStd Res:
Related:	4qc1, 4qc3
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[BAZ2A_HUMAN] Essential component of the NoRC (nucleolar remodeling complex) complex, a complex that mediates silencing of a fraction of rDNA by recruiting histone-modifying enzymes and DNA methyltransferases, leading to heterochromatin formation and transcriptional silencing. In the complex, it plays a central role by being recruited to rDNA and by targeting chromatin modifying enzymes such as HDAC1, leading to repress RNA polymerase I transcription. Recruited to rDNA via its interaction with TTF1 and its ability to recognize and bind histone H4 acetylated on 'Lys-16' (H4K16ac), leading to deacetylation of H4K5ac, H4K8ac, H4K12ac but not H4K16ac. Specifically binds pRNAs, 150-250 nucleotide RNAs that are complementary in sequence to the rDNA promoter; pRNA-binding is required for heterochromatin formation and rDNA silencing (By similarity).

Publication Abstract from PubMed

Binding of the chromatin remodeling complex NoRC to RNA complementary to the rDNA promoter mediates transcriptional repression. TIP5, the largest subunit of NoRC, is involved in recruitment to rDNA by interactions with promoter-bound TTF-I, pRNA, and acetylation of H4K16. TIP5 domains that recognize posttranslational modifications on histones are essential for recruitment of NoRC to chromatin, but how these reader modules recognize site-specific histone tails has remained elusive. Here, we report crystal structures of PHD zinc finger and bromodomains from human TIP5 and BAZ2B in free form and bound to H3 and/or H4 histones. PHD finger functions as an independent structural module in recognizing unmodified H3 histone tails, and the bromodomain prefers H3 and H4 acetylation marks followed by a key basic residue, KacXXR. Further low-resolution analyses of PHD-bromodomain modules provide molecular insights into their trans histone tail recognition, required for nucleosome recruitment and transcriptional repression of the NoRC complex.

Molecular basis of histone tail recognition by human TIP5 PHD finger and bromodomain of the chromatin remodeling complex NoRC.,Tallant C, Valentini E, Fedorov O, Overvoorde L, Ferguson FM, Filippakopoulos P, Svergun DI, Knapp S, Ciulli A Structure. 2015 Jan 6;23(1):80-92. doi: 10.1016/j.str.2014.10.017. Epub 2014 Dec , 18. PMID:25533489^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Tallant C, Valentini E, Fedorov O, Overvoorde L, Ferguson FM, Filippakopoulos P, Svergun DI, Knapp S, Ciulli A. Molecular basis of histone tail recognition by human TIP5 PHD finger and bromodomain of the chromatin remodeling complex NoRC. Structure. 2015 Jan 6;23(1):80-92. doi: 10.1016/j.str.2014.10.017. Epub 2014 Dec , 18. PMID:25533489 doi:http://dx.doi.org/10.1016/j.str.2014.10.017

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4qbm"

@@ Line 1: / Line 1: @@
 ==Crystal structure of human BAZ2A bromodomain in complex with a diacetylated histone 4 peptide (H4K16acK20ac)==
 <StructureSection load='4qbm' size='340' side='right' caption='[[4qbm]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=ALY:N(6)-ACETYLLYSINE'>ALY</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4qc1|4qc1]], [[4qc3|4qc3]]</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4qbm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qbm OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4qbm RCSB], [http://www.ebi.ac.uk/pdbsum/4qbm PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4qbm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qbm OCA], [http://pdbe.org/4qbm PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4qbm RCSB], [http://www.ebi.ac.uk/pdbsum/4qbm PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4qbm ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4qbm" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4qbm

From Proteopedia

Revision as of 18:35, 1 February 2017

Crystal structure of human BAZ2A bromodomain in complex with a diacetylated histone 4 peptide (H4K16acK20ac)

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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