Interpretation of energy-transfer experiments by theoretical studies of model compounds using semiempirical potential functions. II. Monte Carlo calculations on oligopeptides

✍ Scribed by Marc Leclerc; Samuel Premilat; Roger Guillard; Claire Renneboog-Squilbin; Anne Englert

• Publisher: Wiley (John Wiley & Sons)
• Year: 1977
• Tongue: English
• Weight: 625 KB
• Volume: 16
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1977.360160305

✦ Synopsis

Abstract

The properties relevant to nonradiative energy transfer have been computed in the unperturbed chain model for oligopeptides composed of from 4 to 21 residues of the formula Tyr‐(Ala)~n~‐Tyr and Trp‐(X)~n~‐Tyr, X being either Ala or Gly. A Monte Carlo method has been used for the generation of the chains.

The relation between the distribution functions of the distances between the luminophores and the various properties in energy transfer has been examined for chains of different lengths and compositions.

The averge of the orientation factor κ^2^ has been computed as a functions of chain length both for molecules in a randomly coiled state and for molecules with backbones in a well‐defined three‐dimensional structure.

The various averaging regimes of energy‐transfer efficiency and of fluorescence decay are compared. Theoretical curves relating experimental efficiencies to the mean distance between the luminophores are proposed.