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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Freixo, Maria do Rosário Karmali, Amin Arteiro, José Maria |
| Description | Country affiliation: Portugal Author Affiliation: Freixo Mdo R ( Structural Chemistry Research Center of Instituto Superior Técnico of Universidade Técnica de Lisboa, Av. Rovisco Pais, 1100, Lisbon, Portugal.) |
| Abstract | A strain of Pleurotus ostreatus was grown in tomato pomace as sole carbon source for production of laccase. The culture of P. ostreatus revealed a peak of laccase activity (147 U/L of fermentation broth) on the 4th day of culture with a specific activity of 2.8 U/mg protein. Differential chromatographic behaviour of laccase was investigated on affinity chromatographic matrices containing either urea, acetamide, ethanolamine or IDA as affinity ligands. Laccase exhibited retention on such affinity matrices and it was purified on a Sepharose 6B-BDGE-urea column with final enzyme recoveries of about 60%, specific activity of 6.0 and 18.0 U/mg protein and purification factors in the range of 14-46. It was also possible to demonstrate that metal-free laccase did not adsorb to Sepharose 6B-BDGE-urea column which suggests that adsorption of native laccase on this affinity matrix was apparently due to the specific interaction of carbonyl groups available on the matrix with the active site Cu (II) ions of laccase. The kinetic parameters (V(max), K(m), K(cat), and K(cat)/K(m)) of the purified enzyme for several substrates were determined as well as laccase stability and optimum pH and temperature of enzyme activity. This is the first report describing the production of laccase from P. ostreatus grown on tomato pomace and purification of this enzyme based on affinity matrix containing urea as affinity ligand. |
| File Format | HTM / HTML |
| ISSN | 09593993 |
| Issue Number | 1 |
| Volume Number | 28 |
| e-ISSN | 15730972 |
| Journal | World Journal of Microbiology and Biotechnology |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2012-01-01 |
| Publisher Place | Germany |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Research Support, Non-u.s. Gov't Discipline Microbiology Isoenzymes Lycopersicon Esculentum Isolation & Purification Substrate Specificity Biosynthesis Metabolism Fermentation Carbon Industrial Waste Journal Article Discipline Biotechnology Pleurotus Growth & Development Chemistry Chromatography, Affinity Analysis Agriculture Hydrogen-ion Concentration Kinetics Enzymology Copper Laccase |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Medicine Applied Microbiology and Biotechnology Biotechnology |
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