The functional roles of the unstructured N- and C-terminal regions in alphaB-crystallin and other mammalian small heat-shock proteins
Carver, J.A.; Grosas, A.B.; Ecroyd, H.; Quinlan, R.A.
Professor Roy Quinlan email@example.com
Small heat-shock proteins (sHsps), such as αB-crystallin, are one of the major classes of molecular chaperone proteins. In vivo, under conditions of cellular stress, sHsps are the principal defence proteins that prevent large-scale protein aggregation. Progress in determining the structure of sHsps has been significant recently, particularly in relation to the conserved, central and β-sheet structured α-crystallin domain (ACD). However, an understanding of the structure and functional roles of the N- and C-terminal flanking regions has proved elusive mainly because of their unstructured and dynamic nature. In this paper, we propose functional roles for both flanking regions, based around three properties: (i) they act in a localised crowding manner to regulate interactions with target proteins during chaperone action, (ii) they protect the ACD from deleterious amyloid fibril formation and (iii) the flexibility of these regions, particularly at the extreme C-terminus in mammalian sHsps, provides solubility for sHsps under chaperone and non-chaperone conditions. In the eye lens, these properties are highly relevant as the crystallin proteins, in particular the two sHsps αA- and αB-crystallin, are present at very high concentrations.
Carver, J., Grosas, A., Ecroyd, H., & Quinlan, R. (2017). The functional roles of the unstructured N- and C-terminal regions in alphaB-crystallin and other mammalian small heat-shock proteins. Cell Stress and Chaperones, 22(4), 627-638. https://doi.org/10.1007/s12192-017-0789-6
|Journal Article Type||Article|
|Acceptance Date||Mar 18, 2017|
|Online Publication Date||Apr 8, 2017|
|Publication Date||Apr 8, 2017|
|Deposit Date||Mar 22, 2017|
|Publicly Available Date||Apr 8, 2018|
|Journal||Cell Stress and Chaperones|
|Peer Reviewed||Peer Reviewed|
Accepted Journal Article
The final publication is available at Springer via https://doi.org/10.1007/s12192-017-0789-6