Tobias Baumgart

Assistant Professor
Physical and Biological Chemistry

Office: 250N
Phone: (215) 573-7539
Fax: (215) 898-6242
Email: baumgartsasupennedu
Research Group Website: http://www.sas.upenn.edu/~baumgart/

Jump to: Research Statement | Education and Academic History | Selected Publications


Starfish vesicle with two coexisting fluid phases (shown in red and blue) that redistribute between regions of high and small curvature. Bar: 5�m

Research Statement

Research in the Baumgart group is largely centered on the physical chemistry of amphiphile membranes with lateral heterogeneity resulting from non-ideal mixing. Our aims include characterization of biologically relevant membranes including lipids and proteins, where we investigate both composition and shape (curvature) heterogeneity. Both of these aspects are thought to be highly relevant to the function of biological membranes. We focus on freely suspended, rather than solid supported membranes, with an emphasis on bilayer membranes, but we also include monolayer systems. We investigate membranes that laterally segregate into co-existing fluid phases, and are particularly interested in quantitatively understanding the phenomenon of line tension at the phase boundary. We also examine molecular details that govern the partitioning of functionally relevant protein constructs between coexisting membrane phases and thereby aim to contribute to enhancing the biophysical understanding of transmembrane signal transduction, particularly in immune cells such as T-cells, B-cells and mast cells. Our research on aspects of membrane shape is directed at understanding how molecules sort in membrane curvature gradients. This curvature sorting likely contributes substantially to intracellular membrane sorting and trafficking. Furthermore we have recently begun to investigate phase coexistence in binary mixtures of amphiphilic di-block copolymers. Finally, we develop methods to pattern cellular signaling ligands, such as antibodies and adhesion molecules, on pattern scales both above and below optical resolution.


Education and Academic History

Selected Publications
29) Reminick J., Fang X., Go M., Stinson B., Baumgart T., "Lateral protein partitioning between and temperature dependence of fluid lipid/protein domains in giant plasma membrane vesicles." (in preparation)

28) Levental I., Byfield F.J., Choudhourie P., Madara J., Gai F., Baumgart T., Janmey P.A. "Cholesterol-dependent phase separation in cell-derived giant plasma membrane vesicles." (submitted)

27) Baker RG, Hsu CJ, Lee D, Jordan, M.S., Maltzman J.S., Hammer D.A., Baumgart T, and Koretzky G.A. “The adapter protein SLP-76 mediates “outside-in” integrin signaling and function in T cells” (submitted)

26) DA. Christian, A. Tian, WG. Ellenbroek, I Levental, K Rajagopal, PA. Janmey, AJ. Liu1, T. Baumgart, DE. Discher, “Spotted polymer vesicles and Striped micelles induced by ligand binding”, In Press, Nature Materials

25) Oh H., Mohler III ER, Tian A, Baumgart T, and Diamond SL. "Membrane cholesterol is a biomechanical regulator of neutrophil adhesion." In Print. ATVB (Arteriosclerosis, Thrombosis, and Vascular Biology)

24) Aiwei Tian, Benjamin R. Capraro, Cinzia Esposito, Tobias Baumgart. “Bending stiffness depends on curvature of ternary lipid mixture tubular membranes.” Biophysical Journal. In Press.

23) Das SL, Jenkins JT, Baumgart T. "Neck geometry and shape transitions in vesicles with co-existing fluid phases: Role of Gaussian curvature stiffness versus spontaneous curvature." Europhysics Letters, 2009, 86, 48003-48008. DOI

22) Tian, A. and Baumgart, T. "Sorting of lipids and proteins in membrane curvature gradients." Biophysical Journal, 2009, 96, 2676-2688. DOI - offered free as a Featured Article

21) Das S., Tian A., Baumgart T., "Mechanical stability of micropipette aspirated giant vesicles with fluid phase coexistence." Journal of Physical Chemistry, B 2008, 112, 11625-11630. DOI

20) Heinrich M.C., Levental I., Gelman H., Janmey P.A., Baumgart T. "Critical exponents for line tension and dipole density difference from lipid monolayer domain boundary fluctuations." Journal of Physical Chemistry, B 2008, 112, 8063-8068. DOI

19) Esposito C., Tian A., Melamed S., Johnson C., Tee S.-Y., Baumgart T., "Flicker spectroscopy of thermal lipid bilayer domain boundary fluctuations." Biophysical Journal, 2007, 93, 3169-3181. DOI

18) Hess S., Gudheti M., Mlodzianoski M., Baumgart T. "Shape analysis of giant vesicles with fluid phase coexistence by laser scanning microscopy to determine curvature, bending elasticity and line tension." Methods in Molecular Biology, 2007, 400, 367-387. DOI

17) Tian, A., C. Johnson, W. Wang and T. Baumgart. "Line Tension at Fluid Membrane Domain Boundaries Measured by Micropipette Aspiration." Physical Review Letters, 2007, 98, 208102. DOI

16) Wu M., Baumgart T., Hammond S., Holowka D., Baird B., "Differential targeting of secretory lysosomes and recycling endosomes in mast cells revealed by patterned antigen." Journal of Cell Science, 2007, 120, 3147-3154. DOI

15) Baumgart, T., Hunt G., Farkas E., Webb W., Feigenson F., "Fluorescence probe partitioning between Lo / Ld phases in lipid membranes." Biochimica et Biophysica Acta, 2007, 1768, 2182-2194. DOI

14) Baumgart, T., Hammond, A.; Sengupta, P.; Hess, S.; Holowka, D.; Baird, B.; Webb, W.W. "Large-Scale Fluid/Fluid Phase Separation of Proteins and Lipids in Giant Plasma Membrane Vesicles." PNAS, 2007, 104, 3165-3170. DOI

13) Baumgart T., Das, S., Webb, W.W., Jenkins, JT. "Membrane Elasticity in Giant Vesicles with Fluid Phase Coexistence." Biophysical Journal 2005, 89 (2), 1067-1080. DOI

12) Hammond, A.T., Heberle, F.A., Baumgart, T., Holowka, D., Baird, B., Feigenson, G.W. "Crosslinking a Lipid Raft Component Triggers Liquid Ordered-Liquid Disordered Phase Separation in Model Plasma Membranes." Proceedings of the National Academy of Sciences of the United States of America 2005, 102 (18), 6320-6325. DOI

11) Korlach, J., Baumgart, T., Feigenson, G.W., Webb, W.W. "Detection of Motional Heterogeneities in Lipid Bilayer Membranes by Dual Probe Fluorescence Correlation Spectroscopy." Biochimica et Biophysica Acta, 2005, 1668, 158-163. DOI

10) Baumgart, T., Hess, S.T., Webb, W.W., "Imaging Coexisting Fluid Domains in Biomembrane Models Coupling Curvature and Line Tension." Nature 2003, 425, 821-824. DOI