5AN3

Structure of an Sgt1-Skp1 Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The crystal structure of the Sgt1-Skp1 complex: the link between Hsp90 and both SCF E3 ubiquitin ligases and kinetochores.

Willhoft, O.Kerr, R.Patel, D.Zhang, W.Al-Jassar, C.Daviter, T.Millson, S.H.Thalassinos, K.Vaughan, C.K.

(2017) Sci Rep 7: 41626-41626

  • DOI: 10.1038/srep41626

  • PubMed Abstract: 
  • The essential cochaperone Sgt1 recruits Hsp90 chaperone activity to a range of cellular factors including SCF E3 ubiquitin ligases and the kinetochore in eukaryotes. In these pathways Sgt1 interacts with Skp1, a small protein that heterodimerizes wit ...

    The essential cochaperone Sgt1 recruits Hsp90 chaperone activity to a range of cellular factors including SCF E3 ubiquitin ligases and the kinetochore in eukaryotes. In these pathways Sgt1 interacts with Skp1, a small protein that heterodimerizes with proteins containing the F-box motif. We have determined the crystal structure of the interacting domains of Saccharomyces cerevisiae Sgt1 and Skp1 at 2.8 Å resolution and validated the interface in the context of the full-length proteins in solution. The BTB/POZ domain of Skp1 associates with Sgt1 via the concave surface of its TPR domain using residues that are conserved in humans. Dimerization of yeast Sgt1 occurs via an insertion that is absent from monomeric human Sgt1. We identify point mutations that disrupt dimerization and Skp1 binding in vitro and find that the interaction with Skp1 is an essential function of Sgt1 in yeast. Our data provide a structural rationale for understanding the phenotypes of temperature-sensitive Sgt1 mutants and for linking Skp1-associated proteins to Hsp90-dependent pathways.


    Organizational Affiliation

    Institute of Structural and Molecular Biology, University College London and Birkbeck, Biological Sciences, Malet Street, London, WC1E 7HX, UK.,Institute of Structural and Molecular Biology, University College London and Birkbeck, Division of Biosciences, Darwin Building, Gower Street, London, WC1E 6BT, UK.,School of Life Sciences, Joseph Banks Laboratory, University of Lincoln, Lincoln, LN6 7TS, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SGT1
A, B, C
150Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SGT1
Find proteins for Q08446 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q08446
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SUPPRESSOR OF KINETOCHORE PROTEIN 1
D
131Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: SKP1 (CBF3D)
Find proteins for P52286 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: SKP1
Go to UniProtKB:  P52286
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.202 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 94.560α = 90.00
b = 94.560β = 90.00
c = 122.990γ = 120.00
Software Package:
Software NamePurpose
Auto-Rickshawphasing
BUSTERrefinement
xia2data reduction
xia2data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-02-15
    Type: Database references