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© Research
Publication : Nature structural & molecular biology

Solid-state NMR and SAXS studies provide a structural basis for the activation of alphaB-crystallin oligomers

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature structural & molecular biology - 29 Aug 2010

Jehle S, Rajagopal P, Bardiaux B, Markovic S, Kühne R, Stout JR, Higman VA, Klevit RE, van Rossum BJ, Oschkinat H

Link to Pubmed [PMID] – 20802487

Nat. Struct. Mol. Biol. 2010 Sep;17(9):1037-42

The small heat shock protein alphaB-crystallin (alphaB) contributes to cellular protection against stress. For decades, high-resolution structural studies on oligomeric alphaB have been confounded by its polydisperse nature. Here, we present a structural basis of oligomer assembly and activation of the chaperone using solid-state NMR and small-angle X-ray scattering (SAXS). The basic building block is a curved dimer, with an angle of approximately 121 degrees between the planes of the beta-sandwich formed by alpha-crystallin domains. The highly conserved IXI motif covers a substrate binding site at pH 7.5. We observe a pH-dependent modulation of the interaction of the IXI motif with beta4 and beta8, consistent with a pH-dependent regulation of the chaperone function. N-terminal region residues Ser59-Trp60-Phe61 are involved in intermolecular interaction with beta3. Intermolecular restraints from NMR and volumetric restraints from SAXS were combined to calculate a model of a 24-subunit alphaB oligomer with tetrahedral symmetry.

http://www.ncbi.nlm.nih.gov/pubmed/20802487