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  • Polymer and Materials Science  (2)
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  • 1
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We examine the effects of concentration (aggregation), buffers, and ligation, under conditions of either constant ligand activity or limited total amount of ligand, upon thermal denaturation of macromolecules as measured by scanning calorimetry. In doing so we utilize and extend an earlier generalized allosteric treatment [S. J. Gill, B. Richey, G. Bishop, and J. Wyman (1985) Biophys. Chem. 21, 1-14], applicable to ligand binding, enthalpy changes, and volume changes in a macromolecular system. The approach is contrasted with formulations based on the idea of structural domains. We show how information from the full scanning calorimetric curves can be utilized in arriving at and testing appropriate models for observed behavior in selected examples.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 30 (1990), S. 335-347 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A straightforward hierarchical statistical-mechanical approach is shown to enable one to describe the stability of the alpha helix in the presence of side-chain interactions. The formulation can be used with even the simple nearest-neighbor models and it is demonstrated explicitly with the popular 2 × 2 Zimm-Bragg model [B. H. Zimm and J. K. Bragg (1959) J. Chem. Physics 31, 526-535]. It involves a conceptual dissection of the polypeptide chain into interacting blocks; the behavior of any block with side-chain interactions is treated then with conventional binding polynomial techniques. This dissection is a manifestation of “nesting,” which is a hierarchical framework for the description of the behavior of complex macromoecules [C. H. Robert, H. Decker, B. Richey, S. J. Gill, and J. Wyman (1987) Proc. Natl. Acad. Sci. 84, 1891-1895]. The method is demonstrated through applications to existing detailed data for the pH and salt dependences of the helix-coil transition in the S peptide and in synthetic peptides.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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