The demonstration of molecular break light specificity and
general proof of principle. The observed change in fluorescence
intensity over time of an assay containing 3.2 nM break light at
37°C. (a) Break light A with 100 units of
BamHI (□), break light B with 100 units of
BamHI (○), and break light B without enzyme
(●) (10 mM Tris⋅HCl/50 mM
NaCl/10 mM MgCl2/1 mM DTT, pH 7.9;
λEx = 485 nm, λEm = 517 nM).
(b) Break light A with and 10 units of DNaseI
(□), break light B with 10 units of DNaseI (○),
and break light A without enzyme (●) (40 mM
Tris⋅HCl/10 mM MgSO4/1 mM
CaCl2, pH 8.0; λEx = 485 nm,
λEm = 517 nM).