Abstract
An extracellular lipase (EC 3.1.1.3, AN0512Lip) from Aspergillus niger AN0512 was purified and its characteristics were investigated. After the process of ammonium sulfate precipitation followed by ion-exchange chromatography and gel filtration, the purified lipase was achieved with 203.6-fold purification and 22.1 % recovery. AN0512Lip exhibited the highest activity at 50 °C and pH 5.0. It was thermostable and pH-stable, as indicated by that more than 50 % activity retained at 60 °C for 20 h and more than 90 % activity retained at pH 3.0 for 20 h, respectively. AN0512Lip activity was stimulated by some divalent metal ions (especially Cu2+, Ca2+), while greatly suppressed by EDTA, indicating that AN0512Lip was a metal-activated enzyme. Moreover, AN0512Lip exhibited high tolerance for various polar organic solvents with log P < 0.8, and the highest lipase activity (476 % of its original activity) was achieved after addition of 90 % (V/V) isopropanol to the reaction mixture. AN0512Lip also displayed 3-regiospecificity and great affinity for the long-chain fatty ester. The preliminary test showed that AN0512Lip was a candidate for enriching EPA and DHA in fish oil. All the unique properties, such as thermostability, Cu2+-dependent, 3-regiospecificity, and polar organic solvent-tolerance, indicated that AN0512Lip could have potential applications in the food industry, even in organic synthesis and the pharmaceutical industry.
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Abbreviations
- AN0512Lip:
-
Lipase from Aspergillus niger AN0512
- DH:
-
Degree of hydrolysis
- EDTA:
-
Ethylene diamine tetraacetic acid
- K m :
-
Michaelis constant
- PMSF:
-
Phenylmethanesulfonyl fluoride
- p-NPP:
-
p-Nitrophenyl palmitate
- p-NPD:
-
p-Nitrophenyl dodecanoate
- p-NPO:
-
p-Nitrophenyl octanoate
- p-NPA:
-
p-Nitrophenyl acetate
- SDS:
-
Sodium dodecyl sulfonate
- TLC:
-
Thin-layer chromatography
- V max :
-
The maximum velocity for the reaction
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Acknowledgments
We are grateful for financial support from the National Natural Science Fund of China (Grant Numbers 31130042, 31171630 and 21206046) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Number 20130172110018).
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Liu, G., Hu, S., Li, L. et al. Purification and Characterization of a Lipase with High Thermostability and Polar Organic Solvent-Tolerance from Aspergillus niger AN0512. Lipids 50, 1155–1163 (2015). https://doi.org/10.1007/s11745-015-4052-6
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DOI: https://doi.org/10.1007/s11745-015-4052-6