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Protein Science (2006), 15:2488-2498. Published by Cold Spring Harbor Laboratory Press. Copyright © 2006 The Protein Society
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Conserved F84 and P86 residues in {alpha}B-crystallin are essential to effectively prevent the aggregation of substrate proteins

Puttur Santhoshkumar and K. Krishna Sharma

Mason Eye Institute, University of Missouri Columbia, Missouri 65212, USA

(RECEIVED May 9, 2006; FINAL REVISION August 19, 2006; ACCEPTED August 28, 2006)

Previously, we have shown that residues 73–92 (sequence DRFSVNLDVKHFSPEELKVK) in {alpha}B-crystallin are involved in preventing the formation of light scattering aggregates by substrate proteins. In this study, we made single substitutions of three conserved amino acid residues (H83 -> A, F84 -> G, and P86 -> A) and a nonconserved amino acid residue (K90 -> C) in the functional region of {alpha}B-crystallin and evaluated their role in anti-aggregation activity. Mutation of conserved residues led to changes in intrinsic tryptophan intensity, bis-ANS binding, and in the secondary and tertiary structures. The H83A mutation led to a twofold increase in molar mass, while the other mutants did not produce significant changes in the molar mass when compared to that of wild-type protein. The chaperone-like activity of the H83A mutant was enhanced by 15%–20%, and the chaperone-like activity of F84G and P86A mutants was reduced by 50%–65% when compared to the chaperone-like activity of wild-type {alpha}B-crystallin. The substitution of the nonconserved residue (K90 -> C) did not induce an appreciable change in the structure and function of the mutant protein. Fluorescence resonance energy transfer (FRET) assay demonstrated that destabilized ADH interacted near the K90 region in {alpha}B-crystallin. The data show that F84 and P86 residues are essential for {alpha}B-crystallin to effectively prevent the aggregation of substrate proteins. This study further supports the involvement of the residues in the 73–92 region of {alpha}B-crystallin in substrate protein binding and chaperone-like action.

Keywords: {alpha}B-crystallin; mutation; structure; chaperone; light scattering


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P. Santhoshkumar, P. Udupa, R. Murugesan, and K. K. Sharma
Significance of Interactions of Low Molecular Weight Crystallin Fragments in Lens Aging and Cataract Formation
J. Biol. Chem., March 28, 2008; 283(13): 8477 - 8485.
[Abstract] [Full Text] [PDF]


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