On the thermal stability of alpha-crystallin: a new insight from infrared spectroscopy.


Abstract

alpha-Crystallin is a major structural protein of the vertebrate lens which shows structural and functional similarities to small heat shock proteins. The structure and the thermal stability of bovine alpha-crystallin were studied by Fourier-transform infrared spectroscopy, circular dichroism, and differential scanning calorimetry. Infrared spectroscopic data provide evidence which corroborates the view that the secondary structure of alpha-crystallin is highly ordered and consists predominantly of beta-sheets. However, the present results fail to support the widespread notion of an extremely high thermal stability of the protein. All three experimental approaches used in this study show that alpha-crystallin undergoes a major thermotropic transition with a midpoint at 60-62 degrees C. Furthermore, Fourier-transform infrared spectra provide evidence that this conformational transition is associated with a massive loss of the native beta-sheet structure. These results shed new light on structural properties of alpha-crystallin and have important implications for understanding the mechanism of the chaperone-like action of this protein. Study holds ProTherm entries: 5136 Extra Details: structural protein; beta-sheets; thermotropic transition;,chaperone-like

Submission Details

ID: bu7jw8dE

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:28 p.m.

Version: 1

Publication Details
Surewicz WK;Olesen PR,Biochemistry (1995) On the thermal stability of alpha-crystallin: a new insight from infrared spectroscopy. PMID:7626634
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