Luciferase from Vibrio campbellii is more thermostable and binds reduced FMN better than its homologues

A new luciferase from V. campbellii (Lux_Vc) was cloned and expressed in Escherichia coli and purified to homogeneity. Although the amino acid sequences and the catalytic reactions of Lux_Ve are highly similar to those of the luciferase from V. harveyi (Lux_Vh), the two enzymes have different affinities toward reduced FMN (FMNH-). The catalytic reactions of Lux_Vc and Lux Vh were monitored by stopped-flow absorbance and luminescence spectroscopy at 4 degrees C and pH 8. The measured K-d at 4 degrees C for the binding of FMNH- to Lux_Vc was 1.8 mu M whereas to Lux_Vh, it was 11 mu M. Another difference between the two enzymes is that Lux_Vc is more stable than Lux_Vh over a range of temperatures; Lux_Ve has t(1/2) Of 1020 min while Lux_Vh has t(1/2) of 201 min at 37 degrees C. The superior thermostability and tighter binding of FMNH- make Lux_Vc a more tractable luciferase than Lux_Vh for further structural and functional studies, as well as a more suitable enzyme for some applications. The kinetics results reported here reveal transient states in the reaction of luciferase that have not been documented before.