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Chiral Vibrational Structures of Proteins at Interfaces Probed by Sum Frequency Generation Spectroscopy
Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT, 06520, USA
* Author to whom correspondence should be addressed.
Received: 8 November 2011; in revised form: 13 December 2011 / Accepted: 13 December 2011 / Published: 16 December 2011
Abstract: We review the recent development of chiral sum frequency generation (SFG) spectroscopy and its applications to study chiral vibrational structures at interfaces. This review summarizes observations of chiral SFG signals from various molecular systems and describes the molecular origins of chiral SFG response. It focuses on the chiral vibrational structures of proteins and presents the chiral SFG spectra of proteins at interfaces in the C-H stretch, amide I, and N-H stretch regions. In particular, a combination of chiral amide I and N-H stretches of the peptide backbone provides highly characteristic vibrational signatures, unique to various secondary structures, which demonstrate the capacity of chiral SFG spectroscopy to distinguish protein secondary structures at interfaces. On the basis of these recent developments, we further discuss the advantages of chiral SFG spectroscopy and its potential application in various fields of science and technology. We conclude that chiral SFG spectroscopy can be a new approach to probe chiral vibrational structures of protein at interfaces, providing structural and dynamic information to study in situ and in real time protein structures and dynamics at interfaces.
Keywords: chirality; chiral sum frequency generation spectroscopy; amide I; N-H stretch; protein secondary structures; chiral vibrational structures of proteins; interfaces
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Fu, L.; Wang, Z.; Yan, E.C. Chiral Vibrational Structures of Proteins at Interfaces Probed by Sum Frequency Generation Spectroscopy. Int. J. Mol. Sci. 2011, 12, 9404-9425.
Fu L, Wang Z, Yan EC. Chiral Vibrational Structures of Proteins at Interfaces Probed by Sum Frequency Generation Spectroscopy. International Journal of Molecular Sciences. 2011; 12(12):9404-9425.
Fu, Li; Wang, Zhuguang; Yan, Elsa C.Y. 2011. "Chiral Vibrational Structures of Proteins at Interfaces Probed by Sum Frequency Generation Spectroscopy." Int. J. Mol. Sci. 12, no. 12: 9404-9425.