2K8Q

NMR Structure of Shq1p N-terminal domain


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The box H/ACA snoRNP assembly factor Shq1p is a chaperone protein homologous to Hsp90 cochaperones that binds to the Cbf5p enzyme

Godin, K.S.Walbott, H.Leulliot, N.van Tilbeurgh, H.Varani, G.

(2009) J Mol Biol 390: 231-244

  • DOI: 10.1016/j.jmb.2009.04.076
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Box H/ACA small nucleolar (sno) ribonucleoproteins (RNPs) are responsible for the formation of pseudouridine in a variety of RNAs and are essential for ribosome biogenesis, modification of spliceosomal RNAs, and telomerase stability. A mature snoRNP ...

    Box H/ACA small nucleolar (sno) ribonucleoproteins (RNPs) are responsible for the formation of pseudouridine in a variety of RNAs and are essential for ribosome biogenesis, modification of spliceosomal RNAs, and telomerase stability. A mature snoRNP has been reconstituted in vitro and is composed of a single RNA and four proteins. However, snoRNP biogenesis in vivo requires multiple factors to coordinate a complex and poorly understood assembly and maturation process. Among the factors required for snoRNP biogenesis in yeast is Shq1p, an essential protein necessary for stable expression of box H/ACA snoRNAs. We have found that Shq1p consists of two independent domains that contain casein kinase 1 phosphorylation sites. We also demonstrate that Shq1p binds the pseudourydilating enzyme Cbf5p through the C-terminal domain, in synergy with the N-terminal domain. The NMR solution structure of the N-terminal domain has striking homology to the 'Chord and Sgt1' domain of known Hsp90 cochaperones, yet Shq1p does not interact with the yeast Hsp90 homologue in vitro. Surprisingly, Shq1p has stand-alone chaperone activity in vitro. This activity is harbored by the C-terminal domain, but it is increased by the presence of the N-terminal domain. These results provide the first evidence of a specific biochemical activity for Shq1p and a direct link to the H/ACA snoRNP.


    Organizational Affiliation

    Department of Chemistry, University of Washington, Seattle, 98195, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein SHQ1
A
134Saccharomyces cerevisiaeMutation(s): 1 
Gene Names: SHQ1YIL104C
Find proteins for P40486 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P40486
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • OLDERADO: 2K8Q Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-05-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance