Robert Stahelin

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Biography

Professor Stahelin received his B.S. in biochemistry from the University of Illinois-Chicago in 1998. He earned his Ph.D. in chemistry from the University of Illinois-Chicago in 2003 for studying the structural basis of lipid-protein interactions in health and disease. During postdoctoral work at the University of Illinois-Chicago he investigated the mechanisms with which bioactive lipid signals recruit peripheral proteins in cell signaling and membrane trafficking. He joined the Notre Dame and Indiana University School of Medicine-South Bend faculty in July of 2006.

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Research Interests

Interdisciplinary research focused on biological membranes has revealed them as signaling and trafficking platforms for processes fundamental to life. Biomembranes harbor receptors, ion channels, lipid domains, lipid signals, and scaffolding complexes, which function to maintain cellular growth, metabolism, and homeostasis. Moreover, abnormalities in lipid metabolism attributed to genetic changes among other causes are often associated with diseases such as cancer, arthritis and diabetes. Thus, there is a need to comprehensively understand molecular events occurring within and on membranes as a means of grasping disease etiology and identifying viable targets for drug development. A rapidly expanding field in the last decade has centered on understanding membrane recruitment of peripheral proteins. This class of proteins reversibly interacts with specific lipids in a spatial and temporal fashion in crucial biological processes. Typically, recruitment of peripheral proteins to the different cellular sites is mediated by one or more modular lipid-binding domains through specific lipid recognition. Structural, computational, and experimental studies of these lipid-binding domains have demonstrated how they specifically recognize their cognate lipids and achieve subcellular localization. However, the mechanisms by which these modular domains and their host proteins are recruited to and interact with various cell membranes often vary drastically due to differences in lipid affinity, specificity, penetration as well as protein-protein and intramolecular interactions. As there is still a paucity of predictive data for peripheral protein function, these enzymes are often rigorously studied to characterize their lipid-dependent properties. Our research is targeted at identifying peripheral protein drug targets, designing predictive functions for this class of proteins, and understanding their biological mechanisms of activation as a means of creating better therapies. The below points highlight the different avenues of research in the Stahelin lab:
 

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Recent Papers

Subramanian, P., Vora, M., Gentile, L.B., Stahelin, R.V., and Chalfant, C.E. “Anionic lipids activate group IVA cytosolic phospholipase A2 via distinct and separate mechanisms” (2007) J. Lipid Res., 48, 2701-2708.
Link
Stahelin, R.V., Karathanassis, D., Murray, D., Perisic, O., Bruzik, K.S., Williams, R.L., and Cho, W. “Structural and Membrane Binding Analysis of the PX domain of Bem1p” (2007) J. Biol. Chem., 282, 25737-25747. Link
Hom, R., Vora, M., Regner, M., Subach, O.M., Cho, W., Verkhusha, V.V., Stahelin, R.V., and Kutateladze, T.G. “pH-Dependent Binding of the ENTH Domain of Epsin and the ANTH Domain of AP180 to PI(4,5)P2-Containing Bilayers (2007) J. Mol. Biol., 373, 412-423.
Link
Stahelin, R.V., Subramanian, P., Vora, M., Cho, W., and Chalfant, C.E. “Ceramide-1-Phosphate Binds Group IVA Cytosolic Phospholipase A2 Via a Novel Site in the C2 Domain” (2007) J. Biol. Chem., 282, 20467-20474.
Link
Hanshaw, R.G., Stahelin, R.V., and Smith, B.D. “Noncovalent Keystone Interactions Controlling Biomembrane Structure” (2008) Chemistry, 14, 1690-1697. Link
Sudhahar, C.G., Haney, R.M., Xue, Y., and Stahelin, R.V. "Cellular Membranes and Lipid-Binding Domains as Attractive Targets in Drug Development" (2008) Current Drug Targets, 9, 603-613.

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