We will continue developing UV resonance Raman spectroscopy ('UVRS) as an incisive technique for examining amide excited states, and biomolecular structure and function. We will measure UVRS excitation profiles of peptides and proteins to examine the excited states of the different secondary structure motifs. These studies will also characterize the solution conformational distributions of small peptides. We will develop UVRS methodologies to monitor hydrophobic collapse and ordering of hydrophobic domains. The results above will be utilized in a detailed study of the first stages of peptide folding and unfolding between a-helix and random coil structures, and between fl-sheet and random coil structures. We will experimentally probe the kinetics of protein folding to differentiate between the different dynamics hypothesized by the framework model compared to the hydrophobic collapse mode. We will continue to advance the enabling UV Raman instrumentation with the objective of increasing sensitivity, selectivity and information content.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
2R01GM030741-20
Application #
6542407
Study Section
Molecular and Cellular Biophysics Study Section (BBCA)
Program Officer
Wehrle, Janna P
Project Start
1982-06-01
Project End
2006-06-30
Budget Start
2002-07-01
Budget End
2003-06-30
Support Year
20
Fiscal Year
2002
Total Cost
$545,797
Indirect Cost
Name
University of Pittsburgh
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
053785812
City
Pittsburgh
State
PA
Country
United States
Zip Code
15213
Lanoul, Anatoli; Coleman, Thomas; Asher, Sanford A (2002) UV resonance raman spectroscopic detection of nitrate and nitrite in wastewater treatment processes. Anal Chem 74:1458-61
Asher, S A; Ianoul, A; Mix, G et al. (2001) Dihedral psi angle dependence of the amide III vibration: a uniquely sensitive UV resonance Raman secondary structural probe. J Am Chem Soc 123:11775-81
Lednev, I K; Karnoup, A S; Sparrow, M C et al. (2001) Transient UV Raman spectroscopy finds no crossing barrier between the peptide alpha-helix and fully random coil conformation. J Am Chem Soc 123:2388-92
Boyden, M N; Asher, S A (2001) UV Raman studies of peptide conformation demonstrate that betanova does not cooperatively unfold. Biochemistry 40:13723-7
Ianoul, A; Boyden, M N; Asher, S A (2001) Dependence of the peptide amide III vibration on the phi dihedral angle. J Am Chem Soc 123:7433-4
Holtz, J S; Lednev, I K; Asher, S A (2000) UV resonance Raman study of angiotensin II conformation in nonaqueous environments: lipid micelles and acetonitrile. Biopolymers 57:55-63
Holtz, J S; Holtz, J H; Chi, Z et al. (1999) Ultraviolet Raman examination of the environmental dependence of bombolitin I and bombolitin III secondary structure. Biophys J 76:3227-34
Chi, Z; Asher, S A (1999) Ultraviolet resonance Raman examination of horse apomyoglobin acid unfolding intermediates. Biochemistry 38:8196-203
Chi, Z; Asher, S A (1998) UV resonance Raman determination of protein acid denaturation: selective unfolding of helical segments of horse myoglobin. Biochemistry 37:2865-72
Chi, Z; Chen, X G; Holtz, J S et al. (1998) UV resonance Raman-selective amide vibrational enhancement: quantitative methodology for determining protein secondary structure. Biochemistry 37:2854-64

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