PMID: 99189Jul 1, 1978Paper

Comparison of the stability of phycocyanins from thermophilic, mesophilic, psychrophilic and halophilic algae

Biophysical Chemistry
C H Chen, D S Berns


Protein unfolding of eight different phycocyanins was investigated utilizing circular dichroism and visible spectra. The phycocyanin samples were extracted from algae that are normally found in vastly different environments, and are classified as mesophilic, thermophilic, halophilic and psychrophilic. The ability of these proteins to resist the denaturant urea is in the order of thermophile greater than mesophile, halophile greater than psychrophile. Based on a two-state approximation the apparent free energies of protein unfolding at zero urea denaturant concentration, deltaGH2Oapp, were found to range from 2.4 to 8.8 kcal/mole for the eight phycocyanins at pH 6 and 25 degrees C. The proteins from the thermophile are generally more stable than those from the mesophile. An extra stability of the halophile is believed due to the specific interaction of the proteins and the ions in solution. A correction for deltaGH2Oapp due to minor amino acid differences reveals that the stability and the structural properties of these proteins are primarily affected by this minor difference in amino acid compositions.


May 1, 1977·Canadian Journal of Microbiology·O Kao, D S Berns
Aug 12, 1975·Biochemistry·A S BrownR F Troxler
Sep 1, 1975·Proceedings of the National Academy of Sciences of the United States of America·C H Chen, D S Berns
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Sep 2, 2003·Biopolymers·R MacCollAbdellah Menikh
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Mar 5, 2004·Chembiochem : a European Journal of Chemical Biology·Sandeep Kumar, Ruth Nussinov
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