April 2009
Volume 50, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2009
Dogfish Alpha-Crystallin
Author Affiliations & Notes
  • R. C. Augusteyn
    Vision CRC, Ivanhoe, Australia
  • A. Ghahghaei
    Biology, University of Sistan and Baluchestan, Zadehan, Iran, Islamic Republic of
  • J. Carver
    School of Chemistry and Physics, University of Adelaide, Adelaide, Australia
  • Footnotes
    Commercial Relationships  R.C. Augusteyn, None; A. Ghahghaei, None; J. Carver, None.
  • Footnotes
    Support  National Health and Medical Research Council of Australia, Australian Research Council, Cooperative Research Centre Scheme of Australia
Investigative Ophthalmology & Visual Science April 2009, Vol.50, 2101. doi:
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      R. C. Augusteyn, A. Ghahghaei, J. Carver; Dogfish Alpha-Crystallin. Invest. Ophthalmol. Vis. Sci. 2009;50(13):2101.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To determine if the properties of alpha-crystallin may have changed during the course of evolution by comparing dogfish and bovine alpha-crystallins.

Methods: : Dogfish and bovine alpha-crystallins were compared using a variety of physicochemical techniques, including gel filtration, sedimentation velocity analysis, NMR spectroscopy, tryptophan fluorescence quenching, thiol reactivity and chaperone activity.

Results: : Gel filtration and sedimentation analysis indicated that dogfish alpha-crystallin is isolated as a lower molecular mass aggregate of around 400 kDa than the bovine protein (600 kDa). Probing of the environments of tryptophan and cysteine residues revealed that these residues were in very similar environments. The two proteins had very similar chaperone activities but the dogfish protein became inactive at temperatures above 80°C. Two-dimensional 1HNMR spectroscopy showed that, like the bovine protein, dogfish alpha-crystallin has a flexible C-terminal extension. However, the flexible region in the predominant alphaB subunit of the dogfish protein was longer (17 residues) than that in the bovine alphaA (10 residues) alphaB (12 residues) subunits.

Conclusions: : Dogfish alpha-crystallins shares many properties in common with the bovine protein. It is concluded that the proteins have the same general structure and there has been little change during the ourse of evolution.

Keywords: crystallins • chaperones • protein structure/function 
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