5AMS

Crystal structure of Sqt1

• PDB DOI: https://doi.org/10.2210/pdb5AMS/pdb

• Classification: CHAPERONE
• Organism(s): Saccharomyces cerevisiae
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2015-08-31 Released: 2016-01-13 
• Deposition Author(s): Frenois, F., Legrand, P., Fribourg, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.35 Å
• R-Value Free: 0.222 
• R-Value Work: 0.171 
• R-Value Observed: 0.174 

Literature

Sqt1P is an Eight-Bladed Wd40 Protein

Frenois, F., Legrand, P., Fribourg, S.

(2016) Acta Crystallogr F Struct Biol Commun 72: 59

• PubMed: 26750486 
• DOI: https://doi.org/10.1107/S2053230X15024097
• Primary Citation of Related Structures:  
  5AMS


• PubMed Abstract: 
  

  Ribosome biogenesis in eukaryotes is a complex and highly orchestrated process involving more than 200 accessory factors in addition to ribosomal RNAs and ribosomal proteins. Among the many factors involved, Sqt1p has been reported to specifically bind to uL16 and to act as a chaperone. The crystal structure of full-length Sqt1p from the yeast Saccharomyces cerevisiae has been solved at 3.35 Å resolution. A SAD experiment at the Se K edge and an S-SAD experiment on the same selenomethionine-substituted protein crystal allowed unambiguous positioning of the selenomethionine and Cys residues. On the basis of the atomic structure of Sqt1p, the potential residues involved in uL16 interaction were identified and tested.

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Organizational Affiliation: 

Université de Bordeaux, IECB, 33607 Pessac, France.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 94.4 kDa 
• Atom Count: 5,880 
• Modelled Residue Count: 771 
• Deposited Residue Count: 862 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RIBOSOME ASSEMBLY PROTEIN SQT1	A, B	431	Saccharomyces cerevisiae	Mutation(s): 0
UniProt
Find proteins for P35184 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P35184  Go to UniProtKB:  P35184

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.35 Å
• R-Value Free: 0.222 
• R-Value Work: 0.171 
• R-Value Observed: 0.174 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 165.999	α = 90
b = 165.999	β = 90
c = 95.351	γ = 120

Software Package:

Software Name	Purpose
BUSTER	refinement
MOSFLM	data reduction
SCALEPACK	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2016-01-13 
Deposition Author(s): Frenois, F., Legrand, P., Fribourg, S.

Revision History  

• Version 1.0: 2016-01-13
  Type: Initial release
  
• Version 1.1: 2016-01-20
  Changes: Database references