1ZHI

Complex of the S. cerevisiae Orc1 and Sir1 interacting domains


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.234 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis of the Sir1-origin recognition complex interaction in transcriptional silencing.

Hou, Z.Bernstein, D.A.Fox, C.A.Keck, J.L.

(2005) Proc Natl Acad Sci U S A 102: 8489-8494

  • DOI: 10.1073/pnas.0503525102
  • Primary Citation of Related Structures:  
    1Z1A, 1ZHI

  • PubMed Abstract: 
  • 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) ...

    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.


    Organizational Affiliation

    Department of Biomolecular Chemistry, University of Wisconsin Medical School, Medical Sciences Center, 1300 University Avenue, Madison, WI 53706-1532, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Origin recognition complex subunit 1A225Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: ORC1
UniProt
Find proteins for P54784 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P54784 
Go to UniProtKB:  P54784
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Regulatory protein SIR1B138Saccharomyces cerevisiaeMutation(s): 1 
Gene Names: SIR1
UniProt
Find proteins for P21691 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P21691 
Go to UniProtKB:  P21691
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.234 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.151α = 90
b = 72.151β = 90
c = 310.89γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-06-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references