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SHORT REPORT

Thermophilic Temperature Optimum for Crenarchaeol Synthesis and Its Implication for Archaeal Evolution

Chuanlun L. Zhang,^1* Ann Pearson,² Yi-Liang Li,^1, Gary Mills,¹ and Juergen Wiegel³

Savannah River Ecology Laboratory, University of Georgia, Aiken, South Carolina 29802,¹ Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138,² Department of Microbiology, University of Georgia, Athens, Georgia 30605³

Received 24 January 2006/ Accepted 20 March 2006

The isoprenoid lipid crenarchaeol is widespread in hot springs of California and Nevada. Terrestrial and marine data together suggest a maximum relative abundance of crenarchaeol at 40°C. This warm temperature optimum may have facilitated colonization of the ocean by (hyper)thermophilic Archaea and the major marine radiation of Crenarchaeota.

Present address: Center for Biomarker Analysis, University of Tennessee, Knoxville, TN 37932-2575.

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