3VQM

Small heat shock protein hsp14.0 of C-terminal deletion variant with C-terminal peptide

Summary for 3VQM

• Entry DOI: 10.2210/pdb3vqm/pdb
• Related: 3AAB 3AAC 3VQK 3VQL
• Descriptor: Small heat shock protein StHsp14.0, C-terminal peptide from Small heat shock protein StHsp14.0 (3 entities in total)
• Functional Keywords: alpha-crystallin domain, chaperone
• Biological source: Sulfolobus tokodaii; More
• Total number of polymer chains: 23
• Total formula weight: 190709.36

Authors

Hanazono, Y.,Takeda, K.,Miki, K. (deposition date: 2012-03-26, release date: 2012-06-06, Last modification date: 2023-11-08)

Primary citation

Hanazono, Y.,Takeda, K.,Yohda, M.,Miki, K.
Structural studies on the oligomeric transition of a small heat shock protein, StHsp14.0
J.Mol.Biol., 422:100-108, 2012

PubMed Abstract: The small heat shock proteins (sHsps), which are widely found in all domains of life, bind and stabilize denatured proteins to prevent aggregation. The sHsps exist as large oligomers that are composed of 9-40 subunits and control their chaperone activity by the transition of the oligomeric state. Though the oligomeric transition is important for the biological function of most sHsps, atomic details have not been elucidated. Here, we report crystal structures in both the 24-meric and dimeric states for an sHsp, StHsp14.0 from Sulfolobus tokodaii, in order to reveal changes upon the oligomeric transition. The results indicate that StHsp14.0 forms a spherical 24-mer with a diameter of 115 Å. The diameter is defined by the inter-monomer angle in the dimer. The dimer structure in the dimeric state shows only small differences from that in the 24-meric state. Some significant differences are exclusively observed at the binding site for the C-terminus. Although a dimer has four interactive sites with neighboring dimers, the weakness of the respective interactions is indicated from the size-exclusion chromatography. The small structural changes imply an activation mechanism mediated by multiple weak interactions.

PubMed: 22613762
DOI: 10.1016/j.jmb.2012.05.017

Experimental method

X-RAY DIFFRACTION (2.55 Å)