1z1a

From Proteopedia

(Difference between revisions)

Revision as of 06:53, 25 April 2018

S. cerevisiae Sir1 ORC-interaction domain

Structural highlights

1z1a is a 2 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
NonStd Res:
Related:	1zhi
Gene:	SIR1 (ATCC 18824)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[SIR1_YEAST] Involved in the establishment, but not the maintenance, of heterochromatic silencing at the cryptic mating-type loci HMR and HML. Is recruited by interacting with the ORC1 subunit of the origin recognition complex (ORC), which binds to HML-I or HMR-E silencers, DNA elements that direct the formation of silent chromatin at the mating-type loci. Establishes transcriptional silencing by recruiting the three other SIR proteins, SIR2, SIR3, and SIR4, that function directly in silenced chromatin and establish repression. Also found in centromeric chromatin. Binds to and helps retain CAC1, a subunit of chromatin assembly factor I (CAF-I) at centromeric loci independent on the other SIR proteins.^[1] ^[2] ^[3]

Publication Abstract from PubMed

The Sir1 protein plays a key role in establishing a silent chromatin structure at the cryptic mating-type loci HMR and HML in Saccharomyces cerevisiae by interacting with the bromo-adjacent homology (BAH) domain of the Orc1p subunit of the origin recognition complex (ORC). Here, we present the high-resolution crystal structures of the ORC interaction region (OIR) of Sir1p and that of the complex formed between the OIR and BAH domains. Amino acids within the OIR previously shown to be required for a Sir1p/ORC interaction are presented on a conserved, convex surface that forms a complementary interface with a concave region of the Orc1 BAH domain that is critical for transcriptional silencing. The OIR/BAH interaction surface comprises a network of hydrophobic and polar/ionic interactions between discrete structural modules in each protein and involves several residues that were not implicated in previous studies. These data provide important structural insights into a protein-protein interaction critical for the formation of a specialized chromatin domain within eukaryotic chromosomes.

Structural basis of the Sir1-origin recognition complex interaction in transcriptional silencing.,Hou Z, Bernstein DA, Fox CA, Keck JL Proc Natl Acad Sci U S A. 2005 Jun 14;102(24):8489-94. Epub 2005 Jun 2. PMID:15932939^[4]

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

References

↑ Chien CT, Buck S, Sternglanz R, Shore D. Targeting of SIR1 protein establishes transcriptional silencing at HM loci and telomeres in yeast. Cell. 1993 Nov 5;75(3):531-41. PMID:8221892
↑ Triolo T, Sternglanz R. Role of interactions between the origin recognition complex and SIR1 in transcriptional silencing. Nature. 1996 May 16;381(6579):251-3. PMID:8622770 doi:http://dx.doi.org/10.1038/381251a0
↑ Rusche LN, Kirchmaier AL, Rine J. Ordered nucleation and spreading of silenced chromatin in Saccharomyces cerevisiae. Mol Biol Cell. 2002 Jul;13(7):2207-22. PMID:12134062 doi:http://dx.doi.org/10.1091/mbc.E02-03-0175
↑ Hou Z, Bernstein DA, Fox CA, Keck JL. Structural basis of the Sir1-origin recognition complex interaction in transcriptional silencing. Proc Natl Acad Sci U S A. 2005 Jun 14;102(24):8489-94. Epub 2005 Jun 2. PMID:15932939

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/1z1a"

@@ Line 1: / Line 1: @@
 ==S. cerevisiae Sir1 ORC-interaction domain==
 <StructureSection load='1z1a' size='340' side='right' caption='[[1z1a]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1zhi|1zhi]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SIR1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 ATCC 18824])</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=1z1a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1z1a OCA], [http://pdbe.org/1z1a PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1z1a RCSB], [http://www.ebi.ac.uk/pdbsum/1z1a 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=1z1a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1z1a OCA], [http://pdbe.org/1z1a PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1z1a RCSB], [http://www.ebi.ac.uk/pdbsum/1z1a PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1z1a ProSAT]</span></td></tr>
 </table>
 == Function ==

1z1a

From Proteopedia

Revision as of 06:53, 25 April 2018

S. cerevisiae Sir1 ORC-interaction domain

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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