| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 34582 | Process Biochemistry | 2012 | 9 Pages |
An extracellular lipase (EC 3.1.1.3), SAL-PP1, from Staphylococcus aureus isolated from Arachis hypogaea rhizosphere was purified and characterized. The enzyme was purified using PALL'S Microsep centrifugal device (10 kD cut off), hydrophobic interaction (phenyl sepharose CL-4B column) and Superose-12 gel filtration chromatography and found to have a molecular mass of around 49 kDa. The gene fragment encoding the part of the catalytic site of the SAL-PP1 lipase was sequenced and the deduced amino acid sequence shows 93% identity with that of SEL3. SAL-PP1 showed activity against long acyl-chain triglycerides, various p-nitrophenyl esters and phospholipids. The enzyme shows high stability and activity after incubation with various metal ions (retained >90% activity in presence of Ca2+, Na+, Cu2+, Mg2+, Fe2+, or Hg2+ at 10 mM), organic solvents (retained >80% activity in presence of acetonitrile, ethanol, DMSO, methanol, isopropanol, toluene, or ethylene glycol at 10 mM), detergents (retained >70% activity in Triton X-100, Tween 80, or sodium deoxycholate at 10 mM) and irreversible inhibitors (retained >77% activity in presence of PMSF, leupetin, or β-mercaptoethanol, at 1 mM). Thermal inactivation studies revealed a temperature dependent unfolding of secondary structure of protein. SAL-PP1 showed maximal activity and stability at pH 8.0 and pH 9.0, respectively. The alkali-thermostability, organic solvent-tolerance and broad substrate specificity of this enzyme may have potential implications in detergent formulations, biotransformation, industries, and medicine.
► A novel lipase, SAL-PP1 was purified from Staphylococcus aureus and characterized. ► SAL-PP1 was an alkali-thermostable lipase differs from reported S. aureus lipases. ► It shows high activity in presence of diverse metals and organic solvents. ► It shows broad substrate specificity towards triglycerides and p-nitrophenyl esters. ► It has potential to be used as a biocatalyst for industrial applications.
