3EUD

Structure of the CS domain of the essential H/ACA RNP assembly protein Shq1p


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.228 

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This is version 1.3 of the entry. See complete history


Literature

Structure and Functional Studies of the CS Domain of the Essential H/ACA Ribonucleoparticle Assembly Protein SHQ1.

Singh, M.Gonzales, F.A.Cascio, D.Heckmann, N.Chanfreau, G.Feigon, J.

(2009) J Biol Chem 284: 1906-1916

  • DOI: 10.1074/jbc.M807337200
  • Primary Citation of Related Structures:  
    3EUD

  • PubMed Abstract: 
  • H/ACA ribonucleoprotein particles are essential for ribosomal RNA and telomerase RNA processing and metabolism. Shq1p has been identified as an essential eukaryotic H/ACA small nucleolar (sno) ribonucleoparticle (snoRNP) biogenesis and assembly factor. Shq1p is postulated to be involved in the early biogenesis steps of H/ACA snoRNP complexes, and Shq1p depletion leads to a specific decrease in H/ACA small nucleolar RNA levels and to defects in ribosomal RNA processing ...

    H/ACA ribonucleoprotein particles are essential for ribosomal RNA and telomerase RNA processing and metabolism. Shq1p has been identified as an essential eukaryotic H/ACA small nucleolar (sno) ribonucleoparticle (snoRNP) biogenesis and assembly factor. Shq1p is postulated to be involved in the early biogenesis steps of H/ACA snoRNP complexes, and Shq1p depletion leads to a specific decrease in H/ACA small nucleolar RNA levels and to defects in ribosomal RNA processing. Shq1p contains two predicted domains as follows: an N-terminal CS (named after CHORD-containing proteins and SGT1) or HSP20-like domain, and a C-terminal region of high sequence homology called the Shq1 domain. Here we report the crystal structure and functional studies of the Saccharomyces cerevisiae Shq1p CS domain. The structure consists of a compact anti-parallel beta-sandwich fold that is composed of two beta-sheets containing four and three beta-strands, respectively, and a short alpha-helix. Deletion studies showed that the CS domain is required for the essential functions of Shq1p. Point mutations in residues Phe-6, Gln-10, and Lys-80 destabilize Shq1p in vivo and induce a temperature-sensitive phenotype with depletion of H/ACA small nucleolar RNAs and defects in rRNA processing. Although CS domains are frequently found in co-chaperones of the Hsp90 molecular chaperone, no interaction was detected between the Shq1p CS domain and yeast Hsp90 in vitro. These results show that the CS domain is essential for Shq1p function in H/ACA snoRNP biogenesis in vivo, possibly in an Hsp90-independent manner.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein SHQ1
A, B, C, D, E, F
A, B, C, D, E, F
115Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SHQ1YIL104C
UniProt
Find proteins for P40486 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P40486 
Go to UniProtKB:  P40486
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP40486
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D, E, F
A, B, C, D, E, F
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.228 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 141.938α = 90
b = 146.293β = 90
c = 48.511γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
DMphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL2Mapphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-11-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2018-01-24
    Changes: Structure summary