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Electrostatic Interactions in Phospholipid Membranes Revealed by Coherent 2D IR Spectroscopy
V. V. Volkov, R. Chelli, W. Zhuang, F. Nuti, Y. Takaoka, A. M. Papini, S. Mukamel and R. Righini
Proceedings of the National Academy of Sciences of the United States of America
Vol. 104, No. 39 (Sep. 25, 2007), pp. 15323-15327
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/25449134
Page Count: 5
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The inter- and intramolecular interactions of the carbonyl moieties at the polar interface of a phospholipid membrane are probed by using nonlinear femtosecond infrared spectroscopy. Two-dimensional IR correlation spectra separate homogeneous and inhomogeneous broadenings and show a distinct cross-peak pattern controlled by electrostatic interactions. The inter- and intramolecular electrostatic interactions determine the inhomogeneous character of the optical response. Using molecular dynamics simulation and the nonlinear exciton equations approach, we extract from the spectra short-range structural correlations between carbonyls at the interface.
Proceedings of the National Academy of Sciences of the United States of America © 2007 National Academy of Sciences