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Regulation of αA- and αB-crystallins via phosphorylation in cellular homeostasis
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Regulation of αA- and αB-crystallins via phosphorylation in cellular homeostasis
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Journal Article
Regulation of αA- and αB-crystallins via phosphorylation in cellular homeostasis
2015
Overview
αA-Crystallin (αA) and αB-crystallin (αB) are small heat shock proteins responsible for the maintenance of transparency in the lens. In non-lenticular tissues, αB is involved in both maintenance of the cytoskeleton and suppression of neurodegeneration amongst other roles. Despite their importance in maintaining cellular health, modifications and mutations to αA and αB appear to play a role in disease states such as cataract and myopathies. The list of modifications that have been reported is extensive and include oxidation, disulphide bond formation, C- and N-terminal truncation, acetylation, carboxymethylation, carboxyethylation, carbamylation, deamidation, phosphorylation and methylation. Such modifications, notably phosphorylation, are alleged to cause changes to chaperone activity by inducing substructural changes and altering subunit exchange dynamics. Although the effect modification has on the activities of αA and αB is contentious, it has been proposed that these changes are responsible for the induction of hyperactivity and are thereby indirectly responsible for protein deposition characteristic of many diseases associated with αA and αB. This review compiles all reported sites of αA and αB modifications, and investigates the role phosphorylation, in particular, plays in cellular processes.
Publisher
Springer Basel,Springer Nature B.V
Subject
/ alpha-Crystallin A Chain - chemistry
/ alpha-Crystallin A Chain - genetics
/ alpha-Crystallin A Chain - metabolism
/ alpha-Crystallin B Chain - chemistry
/ alpha-Crystallin B Chain - genetics
/ alpha-Crystallin B Chain - metabolism
/ Biomedical and Life Sciences
/ Humans
/ Mutation
/ Protein Processing, Post-Translational
/ Review
