3CHM

Crystal structure of PCI domain from A. thaliana COP9 signalosome subunit 7 (CSN7)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 

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This is version 1.1 of the entry. See complete history


Literature

The Arabidopsis COP9 signalosome subunit 7 is a model PCI domain protein with subdomains involved in COP9 signalosome assembly

Dessau, M.Halimi, Y.Erez, T.Chomsky-Hecht, O.Chamovitz, D.A.Hirsch, J.A.

(2008) Plant Cell 20: 2815-2834

  • DOI: 10.1105/tpc.107.053801
  • Primary Citation of Related Structures:  
    3CHM

  • PubMed Abstract: 
  • The COP9 Signalosome (CSN) is a multiprotein complex that was originally identified in Arabidopsis thaliana as a negative regulator of photomorphogenesis and subsequently shown to be a general eukaryotic regulator of developmental signaling. The CSN ...

    The COP9 Signalosome (CSN) is a multiprotein complex that was originally identified in Arabidopsis thaliana as a negative regulator of photomorphogenesis and subsequently shown to be a general eukaryotic regulator of developmental signaling. The CSN plays various roles, but it has been most often implicated in regulating protein degradation pathways. Six of eight CSN subunits bear a sequence motif called PCI. Here, we report studies of subunit 7 (CSN7) from Arabidopsis, which contains such a motif. Our in vitro and structural results, based on 1.5 A crystallographic data, enable a definition of a PCI domain, built from helical bundle and winged helix subdomains. Using functional binding assays, we demonstrate that the PCI domain (residues 1 to 169) interacts with two other PCI proteins, CSN8 and CSN1. CSN7 interactions with CSN8 use both PCI subdomains. Furthermore, we show that a C-terminal tail outside of this PCI domain is responsible for association with the non-PCI subunit, CSN6. In vivo studies of transgenic plants revealed that the overexpressed CSN7 PCI domain does not assemble into the CSN, nor can it complement a null mutation of CSN7. However, a CSN7 clone that contains the PCI domain plus part of the CSN6 binding domain can complement the null mutation in terms of seedling viability and photomorphogenesis. These transgenic plants, though, are defective in adult growth, suggesting that the CSN7 C-terminal tail plays additional functional roles. Together, the findings have implications for CSN assembly and function, highlighting necessary interactions between subunits.


    Related Citations: 
    • Expression, purification and crystallization of a PCI domain from the COP9 signalosome subunit 7 (CSN7)
      Dessau, M., Chamovitz, D.A., Hirsch, J.A.
      (2006) Acta Crystallogr Sect F Struct Biol Cryst Commun 62: 1138

    Organizational Affiliation

    Department of Biochemistry, Daniella Rich Institute for Structural Biology, Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
COP9 signalosome complex subunit 7A169Arabidopsis thalianaMutation(s): 0 
Gene Names: FUS5CSN7At1g02090T7I23.24T7I23.25
Find proteins for Q94JU3 (Arabidopsis thaliana)
Explore Q94JU3 
Go to UniProtKB:  Q94JU3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.094α = 90
b = 85.796β = 90
c = 72.343γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
HKL-2000data reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-10-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance