ArticleTripeptides in aqueous solution: Model compounds for the evaluation of the partial molar heat capacities of amino acid side-chains in proteins☆

Add time:09/04/2019    Source:sciencedirect.com

The partial molar heat capacities of the tripeptides of sequence glycyl-X-glycine, where X is one of the amino acids glycine, alanine, valine, serine, tyrosine, lysine and aspartic acid, in aqueous solution have been determined over the 10–100°C range, using high sensitivity scanning microcalorimetry. Using these results, the partial molar heat capacities of the various amino acid side-chains were derived. The values obtained differ significantly from literature data that were derived using partial molar heat capacities for small organic compounds that model the various amino acid side-chains. A rationale has been proposed to account for the observed differences between the side-chain heat capacities derived using partial molar heat capacity data for the tripeptides and those derived using the partial molar heat capacities of the organic analogues.

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