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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 11, No. 1, 2008
Bioline Code: ej08012
Full paper language: English
Document type: Research Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 11, No. 1, 2008

 en Role of PPase-SE in Geotrichum klebahnii check for this species in other resources , a yeast-like fungus able to solubilize pectin
Rojas, Natalia Lorena; Cavalitto, Sebastián Fernando; Mignone, Carlos Fernando & Hours, Roque Alberto

Abstract

Protopectinases (PPases) constitute a heterogeneous group of extracellular enzymes able to release soluble pectin from insoluble protopectin in plant tissues. Geotrichum klebahnii check for this species in other resources (ATCC 42397) produces PPase-SE with endopolygalacturonase activity. PPase-SE has been used for pectin extraction and maceration of plant tissues. Here, the capacity of G. klebahnii to use different pectins as carbon and energy sources (CES) was studied, in addition to PPase-SE capacity to release pectin from lemon peel. The strain was unable to use pectin from different origins as CES. When G. klebahnii was cultivated with mixtures of different amounts of glucose and citrus pectin as CES, the biomass obtained was proportional to the initial concentration of glucose, which was completely consumed. In addition, it produced PPase-SE in a glucose-containing medium. A culture was used for the extraction of pectin from lemon peels. Pectin was enzymatically extracted simultaneously with tissue maceration, yielding 3.7 g of (dry) pectin per 100 g of (wet) lemon peel. Extracted pectin was not metabolized by the strain. It was concluded that G. klebahnii uses PPase-SE to macerate, invade and colonize plant tissues, thus releasing soluble sugars to be used as CES without metabolizing solubilized pectin.

Keywords
carbon balance, enzymatic pectin extraction, microbial pectin utilization, pectinases, synthetic medium.

 
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