4YDZ

Stress-induced protein 1 from Caenorhabditis elegans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The Chaperone Activity of the Developmental Small Heat Shock Protein Sip1 Is Regulated by pH-Dependent Conformational Changes.

Fleckenstein, T.Kastenmuller, A.Stein, M.L.Peters, C.Daake, M.Krause, M.Weinfurtner, D.Haslbeck, M.Weinkauf, S.Groll, M.Buchner, J.

(2015) Mol.Cell 58: 1067-1078

  • DOI: 10.1016/j.molcel.2015.04.019
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Small heat shock proteins (sHsps) are ubiquitous molecular chaperones that prevent the aggregation of unfolding proteins during proteotoxic stress. In Caenorhabditis elegans, Sip1 is the only sHsp exclusively expressed in oocytes and embryos. Here, w ...

    Small heat shock proteins (sHsps) are ubiquitous molecular chaperones that prevent the aggregation of unfolding proteins during proteotoxic stress. In Caenorhabditis elegans, Sip1 is the only sHsp exclusively expressed in oocytes and embryos. Here, we demonstrate that Sip1 is essential for heat shock survival of reproducing adults and embryos. X-ray crystallography and electron microscopy revealed that Sip1 exists in a range of well-defined globular assemblies consisting of two half-spheres, each made of dimeric "spokes." Strikingly, the oligomeric distribution of Sip1 as well as its chaperone activity depend on pH, with a trend toward smaller species and higher activity at acidic conditions such as present in nematode eggs. The analysis of the interactome shows that Sip1 has a specific substrate spectrum including proteins that are essential for embryo development.


    Organizational Affiliation

    Center for Integrated Protein Science, Fakultät für Chemie, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Stress-induced protein 1
A, B, C, D
159Caenorhabditis elegansMutation(s): 0 
Gene Names: sip-1
Find proteins for Q20363 (Caenorhabditis elegans)
Go to UniProtKB:  Q20363
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.220 
  • Space Group: P 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 142.550α = 90.00
b = 142.550β = 90.00
c = 100.580γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
XSCALEdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
DFGGermanySFB1035

Revision History 

  • Version 1.0: 2015-06-10
    Type: Initial release
  • Version 1.1: 2015-07-01
    Type: Database references