Research Article

Characterization of the Recombinant Thermostable Lipase (Pf2001) from Pyrococcus furiosus: Effects of Thioredoxin Fusion Tag and Triton X-100

Table 2

Effects of metal ions, chemicals, and detergents on PF2001Δ60 lipase activity. The enzyme (0.5 μg) was incubated at 70°C in 50 mM sodium phosphate buffer (pH 7.0) in the presence of the tested agent using MUF-Hep as substrate. After 10 min, the mixture was assayed for residual activity using the standard lipase assay. The activity of the control was considered 100%.

ChemicalConcentration (mM)Relative activity (%)

KCl10.0107.5
MgCl210.077.9
CaCl210.054.8
SDS1.037.0
DTT1.094.6
Triton X-1006.447.0
EDTA1.097.8
10.0195.7
EGTA1.0103.4
10.0169.0
PMSF1.00.0