Production of heterologous polygalacturonase I from Aspergillus kawachii in Saccharomyces cerevisiae in batch and fed-batch cultures.

ROJAS NL; ORTIZ GE; BARUQUE DJ; CAVALITTO SF; GHIRINGHELLI PD

JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY

SPRINGER HEIDELBERG

Lugar: Berlin / Heidelberg; Año: 2010 vol. 38 p. 1437 - 1447

1367-5435

The pg1 gene from the filamentous fungus Aspergillus kawachii, which codifies for an acid polygalacturonase, was cloned into the pYES2 expression vector, giving rise to the pYES2:pg1DI construct. Engineered Saccharomyces cerevisiae, transformed with pYES2:pg1DI construct, both expressed and exported an active polygalacturonasewith a MW of ~60 kDa and an isoelectric point of 3.7, similar to those reported for the wild-type enzyme. The recombinant enzyme has the ability to hydrolyze polygalacturonic acid at pH 2.5. Heterologous PG1 production was studied under controlled conditions inbatch and fed-batch systems. A simultaneous addition of glucose and galactose was found to be the most suitable feeding strategy assayed, resulting in a final PG1 production of 50 U/ml. The production process proposed in this study could be applied for the industrial production of a novel and useful polygalacturonase.