Title: NMR-Based Microbial Metabolomics and the temperature-dependent coral pathogen Vibrio coralliilyticus
Arezue F. B. Boroujerdi,1,2 Alexander Meyers,3 Elizabeth C. Pollock,4 Sara Lien Huynh,5 Tracey Schock,1,2 Maria Vizcaino2,6, Pamela J. Morris2,6, Daniel W. Bearden1,2
1National Institute of Standards and Technology, Hollings Marine Laboratory, Charleston, SC 29412
2Hollings Marine Laboratory, Charleston, SC 29412
3Tennessee Technological University, Undergraduate Program in Chemical Engineering. Cookeville, TN 38505
4Chemistry Program, The Richard Stockton College of New Jersey, Pomona, NJ 08240
5Mt. Holyoke College, Undergraduate Program in Biology. South Hadley, MA 01075
6Marine Biomedicine and Environmental Sciences, Medical University of South Carolina, Charleston, SC 29412
Coral bleaching occurs when the symbioses between coral animals and their zooxanthellae is disrupted, either as part of a natural cycle or as the result of unusual events. The bacteria Vibrio coralliilyticus has been shown to cause bleaching in the coral Pocillopora damicornis at temperatures higher than 27 °C.1 This temperature-dependence of V. coralliilyticus in regard to its metabolome was addressed. One-dimensional nuclear magnetic resonance (NMR) proton spectra were obtained of methanol-water extracts of intracellular metabolites (the endo-metabolome) from multiple samples of the bacteria cultured into late stationary phase at both a high temperature (27 °C) and a low temperature (24 °C). The spectra were subjected to principal components analysis (PCA), and significant temperature-based separations in PC1, PC2, and PC3 dimensions were observed. Betaine, succinate, and glutamate were identified as metabolites in the V. coralliilyticus samples that cause the greatest temperature-based separations in the PC scores plots. With increasing temperature, betaine was shown to be down regulated and glutamate up regulated. These metabolites function as compatible solutes by helping the cells cope with salt from their seawater environment.
 Ben-Haim, Y., M. Zicherman-Keren, and E. Rosenberg. 2003. Temperature-regulated bleaching and lysis of the coral Pocillopora damicornis by the novel pathogen Vibrio coralliilyticus. Appl. and Environ. Microbiol. 69(7):4236-42.
Mentors Name: Daniel W. Bearden
Division 839 (Analytical Chemistry) Group 00 (NMR), CSTL, Hollings Marine Laboratory, 331 Ft. Johnson Rd., Charleston, SC 29412
Is your mentor a Sigma Xi Member? No