4YDZ

Stress-induced protein 1 from Caenorhabditis elegans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 

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:  
    4YDZ, 4YE0

  • 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, we demonstrate that Sip1 is essential for heat shock survival of reproducing adults and embryos ...

    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. Electronic address: johannes.buchner@tum.de.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Stress-induced protein 1A, B, C, D159Caenorhabditis elegansMutation(s): 0 
Gene Names: sip-1F43D9.4
Find proteins for Q20363 (Caenorhabditis elegans)
Explore Q20363 
Go to UniProtKB:  Q20363
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 
  • Space Group: P 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 142.55α = 90
b = 142.55β = 90
c = 100.58γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
DFGGermanySFB1035

Revision History  (Full details and data files)

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