Abstract
Constitutive expression of the co ld- r egulated COR15a gene of Arabidopsis thaliana results in a significant increase in the survival of isolated protoplasts frozen over the range of −4.5 to −7°C. The increased freezing tolerance is the result of a decreased incidence of freeze-induced lamellar-to-hexagonal II phase transitions that occur in regions where the plasma membrane is brought into close apposition with the chloroplast envelope as a result of freeze-induced dehydration. Moreover, the mature polypeptide encoded by this gene, COR15am, increases the lamellar-to-hexagonal II phase transition temperature of dioleoylphosphatidylethanolamine and promotes formation of the lamellar phase in a lipid mixture composed of the major lipid species that comprise the chloroplast envelope. We propose that COR15am, which is located in the chloroplast stroma, defers freeze-induced formation of the hexagonal II phase to lower temperatures (lower hydrations) by altering the intrinsic curvature of the inner membrane of the chloroplast envelope.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 10:40 a.m.) |
Deposited | 3 years, 4 months ago (April 13, 2022, 3:58 p.m.) |
Indexed | 3 weeks, 1 day ago (Aug. 5, 2025, 8:24 a.m.) |
Issued | 26 years, 9 months ago (Nov. 24, 1998) |
Published | 26 years, 9 months ago (Nov. 24, 1998) |
Published Online | 26 years, 9 months ago (Nov. 24, 1998) |
Published Print | 26 years, 9 months ago (Nov. 24, 1998) |
@article{Steponkus_1998, title={Mode of action of the COR15a gene on the freezing tolerance of Arabidopsis thaliana}, volume={95}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.95.24.14570}, DOI={10.1073/pnas.95.24.14570}, number={24}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Steponkus, Peter L. and Uemura, Matsuo and Joseph, Raymond A. and Gilmour, Sarah J. and Thomashow, Michael F.}, year={1998}, month=nov, pages={14570–14575} }