This project examines the structure of several membrane proteins to determine how their conformations reflect their functional roles, and the means by which proteins fold in hydrophobic environments. It utilizes a number of spectroscopic techniques, including 13C and 1H-nuclear magnetic resonance (NMR) and circular dichroism (CD), to determine details of the molecular configuration and orientation of these molecules in membranes. The secondary structure of a number of membrane proteins, including the H ion-ATPase proteolipid, the erythrocyte anion transport protein (band III) NaKATPase, gramicidin, fd bacteriophage coat protein, and human fibronectin are examined to provide insight into the general folding patterns for membrane proteins and permit model building. The structural manifestations of physiological effectors such as substrates and inhibitors on these proteins are detected in difference spectra and provide information on their mechanism of action. Detailed structural studies on bacteriorhodopsin, band III and the ATPase proteolipid using 1H-and 13C-NMR will define the nature of the active site and the location and orientation of the N-, and C-termini with respect to the membrane surface. These spectroscopic studies are intended to provide high resolution information concerning the active site conformation, molecular orientation, changes with physiological effectors, and modes or protein folding in the hydrophobic environment of the membrane.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM027292-06
Application #
3274700
Study Section
Biophysics and Biophysical Chemistry A Study Section (BBCA)
Project Start
1979-12-01
Project End
1987-08-31
Budget Start
1985-09-01
Budget End
1986-08-31
Support Year
6
Fiscal Year
1985
Total Cost
Indirect Cost
Name
Columbia University (N.Y.)
Department
Type
Schools of Medicine
DUNS #
064931884
City
New York
State
NY
Country
United States
Zip Code
10027
Venugopal, M G; Wolfersberger, M G; Wallace, B A (1992) Effects of pH on conformational properties related to the toxicity of Bacillus thuringiensis delta-endotoxin. Biochim Biophys Acta 1159:185-92
Cascio, M; Gogol, E; Wallace, B A (1990) The secondary structure of gap junctions. Influence of isolation methods and proteolysis. J Biol Chem 265:2358-64
Cascio, M; Glazer, P A; Wallace, B A (1989) The secondary structure of human amyloid deposits as determined by circular dichroism spectroscopy. Biochem Biophys Res Commun 162:1162-6
Wallace, B A; Elstein, D E; Salon, J et al. (1988) Structural studies of Na,K-ATPase subunits. Prog Clin Biol Res 268A:121-8
Wallace, B A (1988) Membrane protein folding: motifs and predictions. Prog Clin Biol Res 273:133-8
Cascio, M; Wallace, B A (1988) Conformation of alamethicin in phospholipid vesicles: implications for insertion models. Proteins 4:89-98
Mielke, D L; Wallace, B A (1988) Secondary structural analyses of the nicotinic acetylcholine receptor as a test of molecular models. J Biol Chem 263:3177-82
Csermely, P; Katopis, C; Wallace, B A et al. (1987) The E1----E2 transition of Ca2+-transporting ATPase in sarcoplasmic reticulum occurs without major changes in secondary structure. A circular-dichroism study. Biochem J 241:663-9
Teeters, C L; Eccles, J; Wallace, B A (1987) A theoretical analysis of the effects of sonication on differential absorption flattening in suspensions of membrane sheets. Biophys J 51:527-32
Wallace, B A; Teeters, C L (1987) Differential absorption flattening optical effects are significant in the circular dichroism spectra of large membrane fragments. Biochemistry 26:65-70

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