Table 1. Binding parameters for poly(U)•poly(A)*poly(U) triplex-alkaloid complexation obtained from McGhee-von Hippel analysis of the Scatchard plot from the spectrophotometric and fluorimetric titration data at 25°Ca.
Alkaloid | Absorbance | Fluorescence | ||
Ki /105 M−1 | n | Ki /105 M−1 | n | |
BC | 2.88±0.02 | 4.3 | 3.9±0.05 | 4.1 |
BC1 | 8.65±0.34 | 4.2 | 9.5±0.10 | 4.0 |
BC2 | 39.87±0.41 | 4.3 | 47.0±0.56 | 4.3 |
Average of four determinations in each case. Ki is the intrinsic binding constant to an isolated binding site and ‘n’ represents the number of excluded sites.