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1Institut für Pharmakologie und Toxikologie, Universitätsklinikum Charité, Dorotheenstraße 94, 10117 Berlin, Germany.
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Cloning and targeted disruption of two polygalacturonase genes in Penicillium olsonii
Article first published online: 9 JAN 2006
DOI: 10.1111/j.1574-6968.2000.tb09120.x
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How to Cite
Wagner, F., Kusserow, H. and Schäfer, W. (2000), Cloning and targeted disruption of two polygalacturonase genes in Penicillium olsonii. FEMS Microbiology Letters, 186: 293–299. doi: 10.1111/j.1574-6968.2000.tb09120.x
Publication History
- Issue published online: 9 JAN 2006
- Article first published online: 9 JAN 2006
- Received 1 March 2000, Revised 30 March 2000, Accepted 30 March 2000
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Keywords:
- Penicillium olsonii;
- Polygalacturonase;
- Polygalacturonase induction;
- Gene disruption
Abstract
The filamentous fungus Penicillium olsonii secretes several polygalacturonases (PGs) with molecular masses of about 47 kDa. These enzymes consist of several basic and acidic isoforms, with dominant activities at pI 4.5 and pI 7.9. Two polygalacturonase genes, pg1 and pg2, have been cloned. The corresponding enzymes, PG1 and PG2, consist of 370 and 380 amino acids, respectively, and show significant similarities to endo-polygalacturonases from other filamentous fungi. Targeted disruption of pg1 resulted in the elimination of all basic PG isoforms. In contrast, disruption of pg2 reduced, but did not eliminate the acidic PG activities. The PGs of P. olsonii must therefore be encoded by a gene family of at least three genes. Induction studies with various carbon sources revealed that the acidic and basic isoforms are differentially regulated. Pectin is the best inducer of the acidic PG isoforms. The basic isoforms, however, are best induced by monosaccharides like glucose, α-L-rhamnose and α-L-arabinose.