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Biophys J. 2002 Sep;83(3):1613-9.

Cooperativity and specificity of association of a designed transmembrane peptide.

Author information

1
The Johnson Research foundation, Department of Biochemistry and University of Pennsylvania, Philadelphia PA 19104-6059, USA.

Abstract

Thermodynamics studies aimed at quantitatively characterizing free energy effects of amino acid substitutions are not restricted to two state systems, but do require knowing the number of states involved in the equilibrium under consideration. Using analytical ultracentrifugation and NMR methods, we show here that a membrane-soluble peptide, MS1, designed by modifying the sequence of the water-soluble coiled-coil GCN4-P1, exhibits a reversible monomer-dimer-trimer association in detergent micelles with a greater degree of cooperativity in C14-betaine than in dodecyl phosphocholine detergents.

PMID:
12202385
PMCID:
PMC1302258
DOI:
10.1016/S0006-3495(02)73930-1
[Indexed for MEDLINE]
Free PMC Article

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