Energy migration and transfer rates are invariant to modeling the fluorescence relaxation by discrete and continuous distributions of lifetimes
2004 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, ISSN 1520-6106, Vol. 108, no 9, 3092-3097 p.Article in journal (Refereed) Published
Fluorescent groups typically exhibit nonexponential photophysics when incorporated into biomolecular structures, e.g., proteins and lipid membranes. Models assuming discrete and continuous distributions of lifetimes can each accurately describe the observed relaxation. In the analyses of energy transfer and PDDEM (partial donor-donor energy migration) experiments, one frequently needs to model the nonexponential decays of noninteracting donor and acceptor groups. The present paper aims at exploring whether calculated transfer/migration rates depend on modeling the photophysics' decay by discrete or continuous distributions of lifetimes. Discrete or continuous distribution models of the decay, generated synthetically, were analyzed as well as true experimental data. Two proteins were studied. In one of the systems, we examined energy transfer from Trp (donor) to BODIPY (acceptor) in ribosomal protein S6, obtained from Thermus thermophilus. In the second system, we examined PDDEM between different BODIPY derivatives that were pairwise specifically incorporated in mutant forms of plasminogen activator inhibitor type 2. Interestingly, the rates of electronic energy migration/transfer and distances determined within pairs of interacting chromophores reveal small or negligible influence on using discrete or continuous distributions of lifetimes.
Place, publisher, year, edition, pages
2004. Vol. 108, no 9, 3092-3097 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:umu:diva-14319DOI: 10.1021/jp031096xOAI: oai:DiVA.org:umu-14319DiVA: diva2:153990