1ZBX

Crystal structure of a Orc1p-Sir1p complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for origin recognition complex 1 protein-silence information regulator 1 protein interaction in epigenetic silencing

Hsu, H.C.Stillman, B.Xu, R.M.

(2005) Proc.Natl.Acad.Sci.USA 102: 8519-8524

  • DOI: 10.1073/pnas.0502946102

  • PubMed Abstract: 
  • The interaction between silence information regulator 1 protein (Sir1p) and origin recognition complex 1 protein (Orc1p), the largest subunit of the origin recognition complex, plays an important role in the establishment of transcriptional silencing ...

    The interaction between silence information regulator 1 protein (Sir1p) and origin recognition complex 1 protein (Orc1p), the largest subunit of the origin recognition complex, plays an important role in the establishment of transcriptional silencing at the cryptic mating-type gene loci in Saccharomyces cerevisiae. Sir1p binds the N-terminal region of Orc1p encompassing a Bromo-adjacent homology (BAH) domain found in various chromatin-associated proteins. To understand the molecular mechanism of Sir protein recruitment, we have determined a 2.5-A cocrystal structure of the N-terminal domain of Orc1p in complex with the Orc1p-interacting domain of Sir1p. The structure reveals that Sir1p Orc1p-interacting domain has a bilobal structure: an alpha/beta N-terminal lobe and a C-terminal lobe resembling the Tudor domain royal family fold. The N-terminal lobe of Sir1p binds in a shallow groove between a helical subdomain and the BAH domain of Orc1p. The structure provides a mechanistic understanding of Orc1p-Sir1p interaction specificity, as well as insights into protein-protein interactions involving BAH domains in general.


    Organizational Affiliation

    Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Origin recognition complex subunit 1
A
219Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: ORC1
Find proteins for P54784 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: ORC1
Go to UniProtKB:  P54784
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Regulatory protein SIR1
B
140Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SIR1
Find proteins for P21691 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P21691
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.220 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 70.000α = 90.00
b = 137.210β = 90.00
c = 139.770γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MADNESSdata reduction
SCALEPACKdata scaling
MADNESSdata collection
PHASESphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-06-21
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description