Luminescence of peptide-bound terbium ions. Determination of binding constants.

Abstract:

:Luminescence of Tb3+ ions bound to a calmodulin fragment has been studied. It is shown that during their lifetime excited ions dissociate from the peptide. If concentration of free peptide is high enough they can be coordinated again. As a consequence, observed terbium luminescence lifetime and intensity depends not only on binding equilibrium, but also on concentration of free peptide molecules. In such a system terbium binding constant cannot be correctly determined by simple steady-state measurements of luminescence intensities. Instead, terbium luminescence decay curves measured at various peptide concentrations must be analysed. Such an analysis has been made for a fragment of the IIIrd calcium binding domain of rat testis calmodulin. Rate constant of terbium association and the equilibrium binding constant corresponding to the best fit of theoretical functions to experimental points have been determined.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Dadlez M,Góral J,Bierzyński A

doi

10.1016/0014-5793(91)80464-e

subject

Has Abstract

pub_date

1991-04-22 00:00:00

pages

143-6

issue

1

eissn

0014-5793

issn

1873-3468

pii

0014-5793(91)80464-E

journal_volume

282

pub_type

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