Abstract
An extracellular 1,3-specific lipase with molecular weight of 35.5 kDa and an isoelectric point of 4.4 from Aspergillus niger has been purified 50-fold by pH precipitation followed by a series of chromatographic steps with an overall yield of 10%. The enzyme was homogeneous as judged by denaturing polyacrylamide gel electrophoresis and size-exclusion fast-performance liquid chromatography. It contained 2.8% sugar which was completely removed by endoglycosidase F treatment, and the deglycosylated enzyme retained full activity. The native lipase showed optimal activity between temperatures 35 and 55°C and pH 5.0 and 6.0. The amino acid composition and the N-terminal sequence were found to be different from lipases previously purified from A. niger. The enzyme was resistant to trypsin, chymotrypsin, endoprotease Glu-C, thrombin, and papain under native conditions but was susceptible to cleavage by the same proteases when heat-denatured.
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Abbreviations
- BSA:
-
bovine serum albumin
- DMSO:
-
dimethylsulfoxide
- FPLC:
-
fast-performance liquid chromatography
- HPLC:
-
high-performance liquid chromatography
- PAS:
-
periodate Schiff's stain
- PITC:
-
phenylisothio-cyanate
- PMSF:
-
phenylmethylsulfonylfluoride
- SDS-PAGE:
-
polyacrylamide gel electrophoresis in sodium dodecyl sulfate
- TCA:
-
trichloroacetic acid
- TLC:
-
thin-layer chromatography
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Haridasan Namboodiri, V.M., Chattopadhyaya, R. Purification and biochemical characterization of a novel thermostable lipase from Aspergillus niger . Lipids 35, 495–502 (2000). https://doi.org/10.1007/s11745-000-549-3
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DOI: https://doi.org/10.1007/s11745-000-549-3