Abstract
An extracellular lipase from Fusarium solani strain (F. solani lipase (FSL)) was purified to homogeneity by ammonium sulphate precipitation, gel filtration and anion exchange chromatography. The purified enzyme has a molecular mass of 30kDa as estimated by sodium dodecyl sulphate polyacrylamide gel electrophoresis. The 12 NH(2)-terminal amino acid residues showed a high degree of homology with a putative lipase from the fungus Necteria heamatoccocae. It is a serine enzyme, like all known lipases from different origins. Interestingly, FSL has not only lipase activity but also a high phospholipase activity which requires the presence of Ca(2+) and bile salts. The specific activities of FSL were about 1,610 and 2,414U/mg on olive oil emulsion and egg-yolk phosphatidylcholine as substrates, respectively, at pH8.0 and 37°C. The (phospho)lipase enzyme was stable in the pH range of 5-10 and at temperatures below 45°C.
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