|Entry||Database: EMDB / ID: EMD-13748|
|Title||Preliminary Single particle cryo-EM reconstruction of a 40-mer assembly of Hsp26 purified from yeast.|
|Sample||40mer complex of WT Hsp26:|
|Function / homology|
Function and homology information
cytoplasmic stress granule / unfolded protein binding / cellular response to heat / protein folding / mRNA binding / mitochondrion / identical protein binding / nucleus / cytoplasm
Similarity search - Function
: / Hsp20/alpha crystallin family / Small heat shock protein (sHSP) domain profile. / Alpha crystallin/Hsp20 domain / HSP20-like chaperone
Similarity search - Domain/homology
Heat shock protein 26
Similarity search - Component
|Biological species||Saccharomyces cerevisiae (baker's yeast)|
|Method||single particle reconstruction / cryo EM / Resolution: 10 Å|
|Authors||Peters C / Weinkauf S / Buchner J|
|Funding support|| Germany, 1 items |
Journal: Nat Commun / Year: 2021
Title: Phosphorylation activates the yeast small heat shock protein Hsp26 by weakening domain contacts in the oligomer ensemble.
Authors: Moritz Mühlhofer / Carsten Peters / Thomas Kriehuber / Marina Kreuzeder / Pamina Kazman / Natalia Rodina / Bernd Reif / Martin Haslbeck / Sevil Weinkauf / Johannes Buchner /
Abstract: Hsp26 is a small heat shock protein (sHsp) from S. cerevisiae. Its chaperone activity is activated by oligomer dissociation at heat shock temperatures. Hsp26 contains 9 phosphorylation sites in ...Hsp26 is a small heat shock protein (sHsp) from S. cerevisiae. Its chaperone activity is activated by oligomer dissociation at heat shock temperatures. Hsp26 contains 9 phosphorylation sites in different structural elements. Our analysis of phospho-mimetic mutations shows that phosphorylation activates Hsp26 at permissive temperatures. The cryo-EM structure of the Hsp26 40mer revealed contacts between the conserved core domain of Hsp26 and the so-called thermosensor domain in the N-terminal part of the protein, which are targeted by phosphorylation. Furthermore, several phosphorylation sites in the C-terminal extension, which link subunits within the oligomer, are sensitive to the introduction of negative charges. In all cases, the intrinsic inhibition of chaperone activity is relieved and the N-terminal domain becomes accessible for substrate protein binding. The weakening of domain interactions within and between subunits by phosphorylation to activate the chaperone activity in response to proteotoxic stresses independent of heat stress could be a general regulation principle of sHsps.
|Structure viewer||EM map: |
Downloads & links
|File||Download / File: emd_13748.map.gz / Format: CCP4 / Size: 83.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)|
|Projections & slices|
Images are generated by Spider.
|Voxel size||X=Y=Z: 1.33 Å|
|Symmetry||Space group: 1|
CCP4 map header:
-Entire 40mer complex of WT Hsp26
|Entire||Name: 40mer complex of WT Hsp26 / Number of Components: 2|
-Component #1: protein, 40mer complex of WT Hsp26
|Protein||Name: 40mer complex of WT Hsp26 / Recombinant expression: No|
|Mass||Theoretical: 955.2 kDa|
|Source||Species: Saccharomyces cerevisiae (baker's yeast)|
|Source (engineered)||Expression System: Saccharomyces cerevisiae (baker's yeast) / Vector: pJV517 / Strain: JT(DIP) GPD26(A)|
-Component #2: protein, Hsp26
|Protein||Name: Hsp26 / Recombinant expression: No|
|Source||Species: Saccharomyces cerevisiae (baker's yeast)|
|Source (engineered)||Expression System: Saccharomyces cerevisiae (baker's yeast)|
|Specimen||Specimen State: Particle / Method: cryo EM|
|Sample solution||pH: 7.4|
|Vitrification||Instrument: FEI VITROBOT MARK IV / Cryogen Name: OTHER / Temperature: 294 K / Humidity: 100 %|
-Electron microscopy imaging
Model: Titan Krios / Image courtesy: FEI Company
|Imaging||Microscope: FEI TITAN KRIOS|
|Electron gun||Electron Source: FIELD EMISSION GUN / Accelerating Voltage: 300 kV / Electron Dose: 140 e/Å2 / Illumination Mode: FLOOD BEAM|
|Lens||Magnification: 105000.0 X (nominal) / Cs: 2.7 mm / Imaging Mode: BRIGHT FIELD / Defocus: 600.0 - 2800.0 nm / Energy Filter: GIF Quantum LS|
|Specimen Holder||Model: FEI TITAN KRIOS AUTOGRID HOLDER|
|Camera||Detector: GATAN K2 SUMMIT (4k x 4k)|
|Image acquisition||Number of Digital Images: 1170|
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