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  • Title: Thermodynamic properties of peptide solutions. Part 11. Partial molar isentropic pressure coefficients in aqueous solutions of some tripeptides that model protein side-chains.
    Author: Hedwig GR, Høiland H.
    Journal: Biophys Chem; 1994 Mar; 49(2):175-81. PubMed ID: 8155817.
    Abstract:
    The partial molar isentropic pressure coefficients at infinite dilution K infinity s,2 (K infinity s,2 = -(delta V infinity 2/delta p)s, where V infinity 2 is the partial molar volume at infinite dilution) have been determined for nine tripeptides in aqueous solution at 25 degrees C. The tripeptides are all of sequence glycyl-X-glycine, where X is an amino acid. These K infinity s,2 results, in conjunction with those of glycylglycylglycine, were used to estimate the amino acid side-chain contributions to K infinity s,2 of peptides. These side-chain contributions are critically compared with previous estimates based on K infinity s,2 data for the amino acids. The variation in the side-chain contributions derived using the peptide K infinity s,2 results has been rationalized in terms of likely peptide-solvent interactions.
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